gujarat technological university · (b) define manpower planning discuss importance and objectives...

Seat No.: _____ Enrolment No.______

GUJARAT TECHNOLOGICAL UNIVERSITY B.E. Sem-V

th Examination December 2010

Subject code: 150001 Subject Name: Management-II

Date: 11 /12 /2010 Time: 03.00 pm - 05.30 pm

Total Marks: 70

Instructions: 1. Attempt all questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.

Q.1 (a) Define product, production and production management. 07

(b) State the benefits derived from effective production management. 07

Q.2 (a) State the functions of production management department. 07

(b) Explain the different types of production systems. 07

OR

(b) What is break even analysis? State the assumption in break even analysis. 07

Q.3 (a) Define market research. State its objectives. 07

(b) Explain the concept of product life cycle. 07

OR

Q.3 (a) Explain the functions of packaging. 07

(b) Explain the importance of demand forecasting. State the features of a good

demand forecasting method.

07

Q.4 (a) Explain the important functions of financial management. 07

(b) Explain the relationship of finance department with the other departments of a

business.

07

OR

Q.4 (a) Explain the role of various financial regulatory bodies. 07

(b) Explain the role of a finance manager. 07

Q.5 (a) Define manpower resources planning. Explain the importance of manpower

resources planning.

07

(b) Explain the process of manpower planning 07

OR

Q.5 (a) Explain the process of Management by Objectives. 07

(b) Define ‘strategy’. Explain the importance of strategy. 07

*************


GUJARAT TECHNOLOGICAL UNIVERSITY B. E. Sem. - V - Examination – June- 2011

Subject code: 150001

Subject Name: Management-II Date:17/06/2011 Time: 10:30 am – 01:00 pm Total Marks: 70




Q.1 (a) Differentiate Marketing from Selling and enumerate various marketing concepts

in brief. 07

(b) What is strategy as per Management by Objective (MOB)? Discuss various

levels of strategy. 07

Q.2 (a) Define Finance Management and enumerate objectives of financial management. 07

(b) Write notes on concept of Work Cells and Computer Assigned Layout Planning. 07

OR

(b) Define manpower planning Discuss importance and objectives of manpower

planning. 07

Q.3 (a) What is Management by Objective (MOB)? Discuss essentials of effective

Management by Objective (MOB). 07

(b) Describe factors affecting the plant location planning and explain difference

between Process layout plant and product layout plant. 07

OR

Q.3 (a) Discuss features, merits and demerits of Management by Objective (MOB)

Process. 07

(b) Explain Plant Layout planning procedure. 07

Q.4 (a) List the activities that come under the ambit of Human Resource and enumerate

Human Resource Planning process. 07

(b) Discuss various bases for segmentation of business market. 07 OR

Q.4 (a) Define Human Resource Management and differentiate recruitment from

selection process. 07

(b) Define Marketing and discuss the role of 4P in formulating marketing strategies. 07

Q.5 (a) An ABC Co. Ltd, has given following information for current year.

(a) Fixed Cost= Rs. 12,00,000.

(b) Variable cost = Rs. 50 per unit.

(c) Estimated sales for current year = Rs. 50,00,000.

(d) Sale price per unit = Rs. 200.

Calculate:-

(i) Break Even Point (BEP)

(ii) Contribution and profit, if likely sales turnover in the next year is

expected Rs. 45,00,000.

(iii) Sales turnover if profit target is Rs. 15,00,000.

07

(b) What is demand forecasting? Explain various qualitative forecasting methods. 07

OR

Q.5 (a) XYZ Co. Ltd, producing a bath soap, which selling price is Rs. 18/- per unit has

a fixed cost equal to Rs. 75,000 and variable cost is Rs. 8.0 per unit.

Determine:-

(i) Production to achieve Break Even Point (BEP)

(ii) Production in no of soaps required to earn a profit of Rs. 15,000.

(iii) Profit, if 40,000 unit are produced.

07

(b) Discuss emerging role of Finance Manager in any large size organization. 07 *************

1

Seat No.: _________ Enrolment No._______________

GUJARAT TECHNOLOGICAL UNIVERSITY B.E SEM-V Examination-Nov/Dec.-2011

Subject code: 150001 Date: 19/11/2011

Subject Name: Management-II

Time: 02.30 pm-05.00 pm Total marks: 70 Instructions:

1. Attempt all questions.



Q.1 (a) Explain in detail 4 P’s of marketing mix. 07

(b) Define segmentation and explain consumer base of

segmentations. 07

Q.2 (a) Explain types of production layout with merits and demerits 07

(b) Draw Break Even Analysis diagram and explain all variables

of diagram with assumption of Break Even Analysis. 07

OR

(b) A D.P company wants to calculate

(1) P/V Ratio.

(2) BEP in Rs.

(3) And fixed cost in Rs.

The company had following information

Sale price per unit Rs.50

Variable cost per unit Rs.30

Profit Per unit Rs.5

No. of unit produce and sold 1000 units

07

Q.3 (a) What is recruitment? States sources of recruitment. 07

(b) Explain stage of selection process 07

OR

Q.3 (a) Define demand forecasting and explain expert opinion method

and time series analysis method. 07

(b) Explain concepts of marketing management 07

Q.4 (a) “profit maximization is objective of Financial Management”-

explain it 07

(b) Explain function of finance manager 07

OR

Q.4 (a) Define financial management and explain scope of financial

management. 07

Q.4 (b) What are the sources of finance for any organization? 07

Q.5 (a) What are the factors affecting plant location selection

decision? 07

(b) Explain level of strategy. 07

OR

Q.5 (a) What is strategy? Explain elements of strategic management. 07

(b) What is MBO? Explain process of MBO 07

*************

of 1

Seat No.: ________ Enrolment No.______________

GUJARAT TECHNOLOGICAL UNIVERSITY BE- V

th SEMESTER–EXAMINATION – MAY/JUNE - 2012



Time: 02:30 pm – 05:00 pm Total Marks: 70

Instructions:




Q.1 (a) Discuss about four P’s of marketing. What is the significance of

advertising in marketing? 07

(b) Distinguish between marketing and selling. 07

Q.2 (a) What are the objectives of financial management. 07

(b) Define market segmentation and discuss the bases of market

segmentation for consumer products. 07

OR

(b) Define demand forecasting and discuss the methods of demand

forecasting. 07

Q.3 (a) Analyze the factors affecting plant location. 07

(b) The total sales figure in a company is 50000 units, the sale price is rs.100

per unit and the variable cost is Rs 20 per unit. The fixed cost of

production is Rs.320000. Find out the breakeven point and the sales

revenue. What is the profit earned by the firm?

07

OR

Q.3 (a) Discuss the significance of financial planning. 07

(b) Define process layout and discuss its advantages and disadvantages. 07

Q.4 (a) Discuss the objectives and functions of human resource management 07

(b) What are the objectives of manpower planning? mention the steps

involved in it 07

OR

Q.4 (a) What are the sources of recruitment? Mention their advantages and

disadvantages 07

(b) Discuss the steps involved in selection process. What are the advantages

of interviews? 07

Q.5 (a) What is management by objectives?Discuss its advantages for an

organization. 07

(b) Discuss the essential requirements of strategic planning needed to keep a

business progressive. 07

OR

Q.5 (a) Mention the objectives and steps in corporate planning 07 (b) Discuss the nature and dimensions of corporate planning. 07

*************

1/1

Seat No.: ________ Enrolment No._________

GUJARAT TECHNOLOGICAL UNIVERSITY BE – SEMESTER V • EXAMINATION – WINTER - 2012

Subject code: 150001 Date: 21-01-2013 Subject Name: Management - II Time: 02:30 pm to 05:00 pm Total Marks: 70 Instructions:

1. Attempt all questions. 2. Make suitable assumptions wherever necessary. 3. Figures to the right indicate full marks.

Q.1 (a)Definemarketinganddiscusswhatismeantbysocietalmarketing 07

(b)Explain marketing mix. Discuss the importance of price and Promotion in marketing.

07

Q.2 (a)What is market segmentation? Discuss the bases for market Segmentation. 07

(b)What is demand forecasting? Discuss the objectives of Short term and long term forecasting.

07

OR (b)Define demand forecasting.Discuss the various methods Of demand forecasting. 07

Q.3 (a)Identify the type’s financial needs of a business and discuss the goals of financial management.

07

(b)Discuss the traditional and the modern approach to the scope of financial management.

07

ORQ.3 (a)Discuss about the various financial functions to be performed by a finance manager. 07

(b)Discuss how far the role of finance manager has emerged due to the change in economic environment in the world.

07

Q.4 (a)Define production management.Discuss the significance of

Production management in enhancing efficiency . 07

(b) Mention the factors influencing plant layout.Discuss the types of plant layout. 07 OR

Q.4 (a)Define strategy.Discuss in brief about levels of strategy. 07 (b) Defint a plant.What are the factors affecting location? 07

Q.5 (a) Discuss the advantages of strategic management for an organization. What are the challenges of strategic management?

07

(b) What are the important sources of recruitment? Discuss the important methods of recruitment.

07

ORQ.5 (a) Discuss the objectives of human resource planning and mention the steps in HRP. 07

(b) What is meant by managing by objectives?Discuss its features. 07

*************

1

Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY BE - SEMESTER–V • EXAMINATION – SUMMER 2013

Subject Code: 150001 Date: 22-05-2013


Time: 10.30 am - 01.00 pm Total Marks: 70 Instructions:




Q.1 (a) State and explain the functions of Marketing. Differentiate between marketing

and selling concept 07

(b) Why market segmentation is important? 07

Q.2 (a) What is financial management? Explain the functions of financial management. 07

(b) Describe various methods of demand forecasting. 07

OR

(b) Describe the role of financial manager. 07

Q.3 (a) What are the factors affecting the location of plant? Explain them in brief. 07

(b) Write a note on market survey. 07

OR

Q.3 (a) What are the factors that affect plant layout? 07

(b) What are the objectives of financial management? 07

Q.4 (a) How important is human resource management in today’s context? 07

(b) Explain manpower planning process. 07 OR

Q.4 (a) Describe the selection process of a typical IT company. 07

(b) What are the sources of recruitment? Explain them in brief. 07

Q.5 (a) Write a note on any two:

1. Management by objectives.

2. Corporate strategy.

3. Criteria for market segmentation.

4. Strategic planning.

14

*************





Subject Name: Microcontroller and Interfacing Date: 13 /12 /2010 Time: 03.00 pm - 05.30 pm

Instructions: Total Marks: 70




Q.1 (a) How Embedded Microcontrollers are differing than Embedding Microprocessor?

Explain with technical justification and application.

07

(b) Explain RISC and CISC ? Which is most suited to Intel 51 Microcontroller? Why? 07

Q.2 (a) What is Special Function register (SFR) of 51-Microcontroller? List all the SFR and

explain SBUF, IP and PCON.

07

(b) Describe and Draw Architecture of intel-51, 8-bit Microcontroller 07

OR

(b) Draw and Describe function of each pins of DIP-51 Intel 8-bit microcontroller 07

Q.3 (a) Explain following Addressing Modes of 8031 Microcontroller

1). MOV A,#20h 2). MOV A,30h 3). MOV A,@R0

4). MOVX A,@DPTR 5). MOVC A,@A+DPTR

07

(b) 1). Describe following pointers

(i) PC (ii) SP (iii) DPTR (iv) R0 & R1

2) What is flag register? Explain 8051 Flag register and its practical implementation

07

OR

Q.3 (a) 1). Differentiate ADDC and SUBB instruction. List the precaution to be taken for

both instructions during the program.

2). List the JUMP and CALL instruction. Describe Conditional JUMP Instruction

07

(b) 1). What is Pseudo Codes? Explain it.

2). Define and describe the directives of 51 Microcontroller.

07

Q.4 (a) 1). Describe TMOD and TCON Special Function registers.

2). Write an assembly program to generate 10Khz Square wave frequency with 60%

duty cycle.(take T = 1.085 x 10-6 sec)

07

(b) 1). How will you assign Counter to count an external event? Explain it with example

2). Can We implement the interrupt to watch the TF bit of TCON Special Function

Register? Explain it.

07

OR

Q.4 (a) What is Serial Communication? How it will perform using 8051/52 Controller with

PC? Explain it with program and diagram.

07

(b) Write an assembly as well as C program to transfer the message “ONE” serially at

9600 buad, 8-bit data, 1 stop bit. Perform this program for 255 times.

07

Q.5 (a) 1). Explain the difference between the low- level and edge-triggered interrupts

2). Explain which technique, Interrupt or Polling, avoids trying down the

Microcontroller.

07

(b) 1) How Liquid Crystal Display (LCD) is superior to conventional Display? Explain it.

2). List and describe the LCD Instructions

07

OR

Q.5 (a) Draw and Explain 8051 connection to ADC 0804 with self checking mode. 07

(b) Draw and explain 8051 connection to external RAM (8Kx8). Write a program to read

100 bytes of data from P1 and save the data in external RAM starting at 5100H

Location.

07

*************

1




Subject Name: Microcontroller & Interfacing Date:20/06/2011 Time: 10:30 am – 01:00 pm

Total Marks: 70




Q.1 (a) What are the interrupts available in the 8051 microcontroller?

Explain interrupt enable (IE) SFR and Interrupt priority (IP) SFR.

07

(b) Explain operation of timer in mode 1. Discuss programming steps to

generate time delay using mode 1. Write program to generate delay

of 0.1 second using timer 0 in mode 1.

07

Q.2 (a) Explain basic architecture of 8051 microcontroller. Discuss RAM

structure.

07

(b) Explain pin configuration with circuit diagram for port 0 and port 1 07

OR

(b) Draw and explain RESET and clock circuit of 8051 microcontroller.

What is the purpose of capacitor in RESET circuit?

07

Q.3 (a) Answer the following questions

[1] What is the purpose of EA pin in 8051 microcontroller?

[2] What is the purpose of EA bit in IE SFR?

[3] What is the function of ALE signal?

[4] Why pull-up resistors are necessary with port P0 in

8051 microcontroller

[5] What is the function of SMOD bit in TCON SFR?

[6] What is the function of GATE bit in TMOD SFR?

[7] Write instruction to select register bank 2.

07

(b) Explain following instructions

[1] SWAP A [2] ADD A,B [3] DIV AB [4] MUL AB

[5] RL A [6] XCHD A,R0 [7] MOV A,@R0

07

OR

Q.3 (a) Write program to generate square wave on port pin P2.0 with

frequency of 10 KHz and duty cycle 50%. Use timer interrupt. Use

timer 0 in mode 2. Assume crystal frequency 12 MHz.

07

(b) Draw interfacing diagram to interface push-button switch at port pin

P3.3 and relay with transistor circuit at port pin P2.0. Write program

such that when push-button key is pressed, relay should become

ON. When push-button key is pressed again relay should become

OFF (i.e. toggling of relay by push-button switch).

07

Q.4 (a) Explain interfacing of analog to digital converter (ADC) with

microcontroller. Write program to read analog value from ADC on

port P1 and display digital values on LEDs connected at port P0

07

(b) Draw and explain interfacing of 4x4 matrix keyboard with 8051

microcontroller. Write program to read switch.

07

2

OR

Q.4 (a) Explain interfacing of stepper motor with microcontroller. Write

program to rotate stepper motor in clockwise direction continuously

in full step mode.

07

(b) Draw interfacing diagram of DAC with 8051 microcontroller. Write

program to generate sinewave at the output of DAC. Use lookup

table to store hex values.

07

Q.5 (a) Discuss interfacing of the LCD with 8051 microcontroller. Draw

interfacing diagram. Write program to display message “GTU IS

BEST” on the LCD screen.

07

(b) Draw interfacing diagram for interfacing of common anode seven

segment displays with 8051 microcontroller. Write program to

display digit 0 to 9 at the interval of approximately 1 second

(Consider crystal frequency 12 MHz)

07

OR

Q.5 (a) Discuss RTC interfacing with microcontroller. Write program to get

values of hour, minute and second from RTC to RAM location

20h,21h and 22h respectively.

07

(b) Discuss interfacing of external 32K EPROM and 32K RAM with

the microcontroller. Draw diagram and explain important

handshaking signals.

07

*************

1




Subject Name: Microcontroller and Interfacing

Time: 02.30 am-05.00 pm Total marks: 70

Instructions:




Q.1 (a) Explain connection between an 8031 and an external memory consisting

of 16K EPROM and an 8K of static RAM with external memory timing

diagram.

07

(b) Explain two types of activation for external hardware interrupts in detail

and also discuss the significance of Gate bit in TMOD register.

07

Q.2 (a) Explain control circuitry between the output latch and port 0, port 1, port

3 and port 4.

07

(b) Explain Serial data transmission modes in detail. 07

OR

(b) (i)Explain indirect addressing, external data moves and code memory

read only data moves with instructions.

(ii) Explain Relative range, short absolute range and long absolute range

with necessary instructions.

07

Q.3 (a) Write a C program using interrupts to do the following:

(i) Generate a 1000 Hz frequency on P2.1 using T0 8 bit auto

reload,

(ii) Use timer 1 as an event counter to count up a 1-Hz pulse and

display it on P0.The pulse is connected to EX1.

Assume that XTAL=11.0592 MHz. Set the baud rate at 9600.

07

(b) Write an assembly language program to generate a square wave with an

ON time of 4 ms and an OFF time of 10 ms on all pins of port

0.Assume an XTAL of 22 MHz.

07

OR

Q.3 (a) Assume that a switch is connected to pin P2.0.

Write a assembly language program to monitor the switch and perform

the following:

(i) If SW=0 send the message “GOOD” to the serial #0 port.

(ii) If SW=1 send the message “MORNING” to the serial #1

port.

07

(b) Write an 8051 C program to toggle all bits of P2 continuously every 500

ms.Use Timer 1, Mode 1 to create the delay.

07

Q.4 (a) Explain how two 16 bit counters T0 and T1 are programmed to count

internal clock pulse as a timer and are programmed to count external

pulses as a counter

07

(b) Assuming that ROM space starting at 350h contains “BEST LUCK”,

Write a program to transfer the bytes into RAM location at 50h.

07

2

OR

Q.4 (a) (i)Explain timer flag interrupt, serial port interrupt and external

interrupts with example.

(ii) Explain byte level and bit level logical operation with example.

07

Q.4 (b) Write an 8051 C program to calculate the checksum bye for given data.4

bytes of hexadecimal data: 25h, 62h, 3Fh, and 52h.

07

Q.5 (a) Explain interfacing of 8051 with ADC0804 chip. 07

(b) Describe RTC interfacing with micro controller. Write program to get

values of hour, minute and second from RTC to RAM location 50h, 51h

and 52h respectively.

07

OR

Q.5 (a) Explain keyboard interfacing with 8051 and also draw flow chart for

Detection and identification of key activation.

07

(b) Describe interfacing of 8051 with DC motor and PWM. 07 ___________________

1





Subject Name: Microcontroller and Interfacing


Instructions:




Q.1 (a) Answer Following Questions

1) What precaution we should take before using SUBB

instruction?

2) What are the conditions for setting the OV flag?

3) Find the system frequency of an 89C51 if the machine

cycle period is 0.546 µs.

4) Under which condition 8051 with internal 4K program

memory would access external program memory?

5) What are the maximum sizes of program memory and

data memory that may be interfaced with MCS-51?

6) What is the difference between a Timer and a Counter?

7) What is the difference between MOVC and MOVX

instructions?

07

(b) Draw schematic diagram for 8051 minimum hardware

configuration. Explain function of power – on – reset

circuit.

07

Q.2 (a) Draw a schematic diagram of 8051 interfaced with 2K

external RAM. With reference to interface diagram drawn,

give the range of memory for which memory can be

accessed.

07

(b) Write a program to check if the character string of length 7,

stored in RAM location40H onwards is a palindrome. If it

is, output Y to P1. Hint: A palindrome is a string in which

the characters are same whether the string is read in

forward or reverse direction.

07

OR

(b) Assume that input at port P1 is data for temperature. Two

LEDs are connected at P0.0 (RED) and P0.1 (GREEN)

with their anodes pulled up through 820Ω resistor and

cathodes are connected with pins. LEDs Write a program

to acquire temperature data and indicate the status on LED

as below. Note: It is require continuously monitoring the

temperature and indicating status on LEDs.

• If TEMP ≤ 10° RED LED ON and GREEN LED

OFF

• If 10° < TEMP ≤ 80° RED LED OFF and GREEN

LED ON

• IF TEMP > °80 RED LED ON and GREEN LED

OFF

07

2

Q.3 (a) Sixteen random numbers are stored in an array, starting

from location 40H. Write an assembly program to count

the number of non-zero elements in this array and store it

in location

30H.

07

(b) Write an 8051 C program to convert 8-bit binary data to

decimal and display the digits on P0,P1, and P2 07

OR

Q.3 (a) Write a program to calculate the average of an array of

unsigned positive integers. The array starts from 41H and

number of terms in the array is available in location 40H.

Store the calculated average in location 3FH.

07

(b) Write an 8051 C program to toggle all the bits of P0 and P2

continuously with a 250ms delay. Use the inverting

operator

07

Q.4 (a) Answer Following:

1) In general, a 12 MHz crystal is used for XX51-based

systems. However, in certain cases, a frequency of

11.0592 is preferred. What is the reason behind it?

03

2) Why there is no Sign-flag in MCS-51? 04

(b) Solve the following:

1) Calculate the reload value for Timer 1 in mode 2 to

generate a baud rate of 2400, if 8051 is interfaced with

a 12 MHz crystal.

04

2) Find the time delay generated by the following routine

if the XTAL = 22 MHz.

HERE : MOV R0,#200

AGAIN : DJNZ R0,AGAIN

RET

03

OR

Q.4 (a) Write a program to generate a square wave with frequency

of 10KHz and with 50% duty cycle using Timer 0. Assume

the external crystal frequency of 12 MHz.

07

(b) Timer 0 is used as a counter, and Timer 1 is used as time

base of 1 second. Write an assembly program to find

frequency of signal connected at P3.4 (counter input for

Timer 0). Assume XTAL = 22MHz.

07

Q.5 (a) Draw schematic diagram of 8051 interfaced with

ADC0804. Use the 8051 clock to generate necessary clock

signal for ADC0804. Use P1 for Data line connection and

P2 for other control signals.

07

(b) Write either assembly or C program for above circuit to

convert analog signal into digital and store it in internal

RAM.

07

OR

Q.5 (a) Draw a schematic diagram of 8051 interfaced with unipolar

stepper motor. Give reason, one need driver IC or circuit

for interfacing stepper motor with 8051.

07

(b) Write a program to rotate a stepper motor, as interfaced in

above problem, by 64° in clockwise direction. Assume the

motor has a step angle of 2°. Use the 4 – step sequence.

07

*************

1



Subject code: 151001 Date: 11-01-2013 Subject Name: Microcontroller and Interfacing Time: 02:30 pm to 05:00 pm Total Marks: 70 Instructions:

1. Attempt all questions. 2. Make suitable assumptions wherever necessary. 3. Figures to the right indicate full marks. 4. Consider crystal frequency as 11.0592 MHz

Q.1 (a) 1. List the factors to be considered for selection of microcontroller for

particular application. 2. State the difference between Control and Conditional flag. Explain flag register of 8051 microcontroller.

03 04

(b) 1. Explain register direct and register indirect addressing mode of 8051 with an example. 2. Explain following in brief.

(i) RISC (ii) Assembler Directive

03 04

Q.2 (a) 1. Explain following 8051 instructions with an example.

(i) MOVX (ii) ANL C, /Bit (iii) CJNE (iv) DIV 2. Describe the functions of following 8051 pins. (i) XTAL1 (ii) ALE (iii) RxD

04 03

(b) Explain PC and DPTR with their significance. Write program to interchange contents of PC and DPTR.

07

OR (b) Explain in detail of timer operation in mode-2. Write program to generate delay

of 0.25 mS using timer-1 in mode-2. Show necessary calculation. 07

Q.3 (a) Explain in detail the structure and operation of port P0 of the 8051

microcontroller. 07

(b) Write short note on following. 1. Intel Hex File Format 2. Data types of Embedded C.

07

ORQ.3 (a) Explain following with respect to 8051 microcontroller interrupt.

1. List the sequence of events that take place when an interrupt occurs. 2. Priority level of various interrupts with their vector addresses. 3. Explain with an example how their priority altered.

07

(b) Write short note on following SFR. 1. TCON 2. SCON

07

Q.4 (a) Write an assembly language program for 8051 to find frequency (in Hz) of the

external pulse train connected at port pin P3.4. Show necessary calculation. 07

(b) Write an Embedded C program for 8051 to find number of positive and negative data among Five byte of array. Send number of positive data to Port P1 and negative data to Port P2.

07

OR Q.4 (a) Write an assembly language program for 8051 using interrupt to complete 07

2

following task simultaneously. 1. Read data from port P1 and send it to port P2 continuously at every 2 mS. Use timer-0 interrupt. 2. Send “A” continuously to serial COM port with 4800 baud rate, 8 bit data and 1 stop bit. Use serial interrupt.

Q.4 (b) Write an Embedded C program for 8051 using interrupt to complete following task simultaneously.

1. Generate square wave of frequency 4 KHz on port pin P1.0. Use timer-0 interrupt. 2. Generate square wave of frequency 1 KHz on port pin P1.7. Use timer-1 interrupt.

07

Q.5 (a) Interface LCD with 8051 and write an assembly language program to display

“MC&I” at line 1, column 5. Explain with neat and clean diagram. 07

(b) Interface three memory chips as per below details with 8051 microcontroller at address 8000H onwards. Draw neat and clean diagram.

1. Chip-1, 4Kx8 bit Data ROM 2. Chip-2, 1Kx8 bit RWM 3. Chip-3, 1Kx8 bit RWM

07

OR Q.5 (a) Interface DAC with 8051 microcontroller and write an assembly language

program to generate triangular waveform. Explain with neat and clean diagram. 07

(b) Write short note on following. 1. DS12887 RTC interfacing with 8051 2. DC motor control with optoisolator

07

*************

1



Subject Code: 151001 Date: 14-05-2013 Subject Name: Microcontroller and Interfacing Time: 10.30 am - 01.00 pm Total Marks: 70 Instructions:


Q.1 (a) Explain with block diagram, the 8051 architecture. 07 (b) Explain various modes of timers in 8051 and explain with assembly

language programming auto reload mode. 07

Q.2 (a) List the addressing modes of 8051 and explain register indirect and indexed

addressing mode in detail with assembly language example. 07

(b) Explain 8051 interrupts with related SFR. 07 OR (b) Write a program to subtract 156F83H from 24759CH save the result In

RAM location starting at 50H.

07

Q.3 (a) Write an assembly language program to convert 8 bit binary data to BCD equivalent. Example ( FF) h = (0010)(0101)(0101) = 255

07

(b) Write an assembly language program that find the position of the first high in an 8-bit data item. The data is scanned from D7 to D0.

07

OR Q.3 (a) Write an assembly language program to generate square wave of 5 KHz

frequency. 07

(b) Write an assembly language program to convert the following series of packed BCD numbers to ASCII. Assume that packed BCD is located in data ROM. 55H, 78H , 54H, 34H

07

Q.4 (a) Write an assembly language program to find the unknown frequency. 07

(b) Compare the following. (1) Microprocessor and microcontroller (2) Edge Triggered Interrupt and Level Triggered Interrupt

07

OR Q.4 (a) Explain with necessary diagram, interfacing of 32K external ROM with

8051. 07

Q.4 (b) Explain with interfacing diagram, 7 segment interfacing with 8051 and write a program to display data accordingly.

07

Q.5 Q.5

(a)

(b)

Explain with necessary sketch, interfacing the LCD with 8051 and write a program to Display “GTU” in the second line and in centre of the 16X2 line display. Explain with diagram of interfacing, ADC 0804 in free running mode interfaced with 8051. OR

07 07

2

Q.5 Q.5

(a)

(b)

With necessary diagram, interface MAX232 with 8051 and send data “Hello World” to the serial port with 9600 baud rate, 8 bit data with 1 start and stop each respectively. Two switches (SW0 and SW1) are connected to pin P2.0 and P2.1 respectively. Write an assembly language program to monitor the status of SW and perform the following with diagram of interfacing.

(1) If SW0 is pressed, the stepper motor moves clockwise (2) If SW1 is pressed, the stepper motor moves anticlockwise. (3) If both switches are pressed simultaneously, motor stops.

*************

07 07

1





Subject Name: Engineering Electromagnetics Date: 15 /12 /2010 Time: 03.00 pm - 05.30 pm

Total Marks: 70




Q.1 (a) Answer the following in brief 08

(i) ‘The divergence of the curl of a vector is zero’-Justify the statement with one

example.

(ii) Find the ay dot aɸ and ax dot aθ

(iii) Given 60 µC point charge located at the origin, find the total electric flux

passing through that portion of the sphere r=26 cm bounded by 0˂θ˂π/2 and

0˂ɸ˂π/2.

(iv) For a coaxial cable find the electric field density inside the inner core, in

between inner and outer core and outside the cable.

(b) Answer the following 06

(i) What is Gradient? with help of gradient prove that E= - V

(ii) Find the volume charge density that is associated with D = ρz2

sin2ɸ

ap + ρz2 sinɸcosɸ aɸ + ρ

2z sin

2ɸ az c/m

2

Q.2 (a) Derive the electric field intensity and electric field density due to an infinite and

uniform line charge density.

07

(b) In the space, a line charge ρL=80 nC/m lies along the entire Z-axis, while point

charge of 100 nC each are located at (1,0,0) and (0,1,0). Find the potential

difference VPQ given P (2,1,0) and Q (3,2,5).

07

OR

(b) Given the flux density D = (2cosθ/r3) ar + (sinθ/r

3) aθ c/m

2, evaluate both sides

of the divergence theorem for the region defined by 1˂ r ˂ 2 , 0 ˂ θ ˂ π/2 , 0˂ ɸ˂

π/2

07

Q.3 (a) Describe the boundary condition between free space and conductor. What is an

importance of boundary condition?

07

(b) Write Maxwell’s equations in point form and explain physical significance of

equations.

07

OR

Q.3 (a) Derive Poisson’s and Laplace’s equations and states their applications. 07

(b) Write Maxwell’s equations in integral form and explain their physical

significance.

07

Q.4 (a) State and explain Ampere’s circuital law. Find the magnetic field intensity due to

long straight conductor using Ampere’s circuital law.

07

(b) A charge of 10 nC is moving with a velocity of 107(-0.5 ax + ay -0.71 az) m/s.

Determine the force exerted on the test charge when

(i) a magnetic induction B = ( ax + 2ay + 3 az) mWb/m2 is applied

(ii) an electric field E = (3ax + 2ay + az) kV/m is applied.

(iii) When B and E given above are applied simultaneously.

07

2

OR

Q.4 (a) What is curl? With help of curl meter explain the physical interpretation of curl

and state its applications.

07

(b) A filamentary current of 10 A is directed in from infinity to the origin on the

positive x axis, and then back to infinity along the positive y axis. Use the Biot-

Savart law to find H at P (0,0,1)

07

Q.5 (a) Define and explain the following terms:

(i) Magnetization (ii) Polarization

(iii) Skin effect and (iv) Standing wave ratio

07

(b) Write short note on:

(i) Wave motion in free space

(ii) Magnetic boundary condition

07

OR

Q.5 (a) Define and explain the following terms:

(i) Poynting Vector (ii) The scalar and Vector magnetic potential

(iii)Hall effect (iv) Retarded Potential

07

(b) (i) Transform the 5ax vector to spherical coordinate at

A(x = 2,y = 3, z = -1).

(ii) Given V = (10/r2 ) sinθcosɸ, Find the electric flux density

at (2, π/2,0)

07

*************

1




Subject Name: Engineering Electromagnetics Date:22/06/2011 Time: 10:30 am – 01:00 pm Total Marks: 70




4. The symbols have the usual meaning.

Q.1 (a) Define electric field intensity. Derive the expression for the intensity of

electric field due a line charge along the Z direction with uniform charge

density ρL c/m using Coulomb’s law and verify the same using Gauss’s law.

07

(b) Prove the following relations from the fundamental principle of

electromagnetic theory :

(i) a

lR

ρ= ohms

(ii) )( BvEQF ×+=

07

Q.2 (a) What is an electric dipole?Derive the expression for the potential and electric

field intensity due to a dipole at distances very large from the origin

compared to the spacing d between the charges +Q and – Q .

07

(b) Given the Potential field in cylindrical coordinates

V=1000 Φ+50 Volts.Calculate the value at P(0.4,30°,1) in air of (i)E (ii)D

(iii) ρv (iv) Energy density

07

OR

(b) Given that ρ

ρaD

4

10 3

= C/m2 in cylindrical coordinates. Evaluate both sides

of the divergence theorem for the volume enclosed by ρ = 1m , ρ = 2m, z = 0

and z =10m

07

Q.3 (a) Assuming the potential function V varies as a function of ρ in cylindrical

coordinates systems ,obtain the solution of Laplace equation and deduce the

value of capacitance of a coaxial capacitor

07

(b) Curl free vector is an irrotational field, which is a conservative field

also.Justify 03

(c) E and F are vector fields given by E = 2xax + ay + yz az and

F = xy ax -y2ay+ xyz az .Determine

(a) | E | a t (l, 2, 3)

(b) The component of E along F at (1, 2, 3)

(c) A vector perpendicular to both E and F at (0, 1, - 3) whose magnitude is

unity

04

OR

Q.3 (a) An infinitely long coaxial cable is carrying current I by the inner conductor of

radius ‘a’ and –I by the outer conductor of radii ‘b’ and ‘c’. where c>b.

(i)Deduce the expressions for H at

i)ρ < a (ii) a <ρ < b (iii) b < ρ < c (iv) ρ > c.Sketch the plot of H as a function

of radius.(ii) Find the inductance of the coaxial cable

07

2

(b) Do as directed

(i) D = 8ρ sin φ aρ + 4ρ cos φ aφ C/m2. Find div D

(ii) Find the laplacian of the scalar yxeV z cosh2sin−= .

07

Q.4 (a) Using Gauss’s law explain the concept of divergence. Prove Divergence

theorem. Obtain Maxwell’s first equation 07

(b) (i) Express the vector field )()( 122

yx yaxayxD ++= − in cylindrical

components . Evaluate D at the point P )5,60,2( 0 === zφρ . Express the

result in cylindrical and Cartesian components.

(ii) Find A×∇ for the vector field θθaA sin10= in spherical coordinates at

P(2,Π/2,0).

07

OR

Q.4 (a) Deduce the boundary conditions with necessary derivations (i)at the interface

between two dielectric materials with permittivities ε1 and ε2 and (ii) at the

interface between two magnetic materials with permeabilities µ1 and µ2

07

(b) A circuit has 2000 turns enclosing a magnetic circuit of 30 sq cm in section.A

current of 5A in the circuit produces a field of flux density 1 wb/cm2

and

when the current is doubled, the flux density increases by 50%.Determine the

value of the inductance of the circuit for the current varying between 5A and

10A.Also find the induced emf when the current increases from 5A to 10A in

0.1sec.

Q.5 (a) Using Faraday’s law and the concept of displacement current density,

Ampere’s circuital law, divergence theorem, obtain all Maxwell’s equations

for time varying fields in point and integral forms .Derive the necessary

equations.

07

(b) A wave propagating in a lossless dielectric has the components

mVaztE x /)10cos(500 7 β−= and yaztH )10cos(1.1 7 β−= A/m.

If the wave is travelling with the velocity of υ =0.5C,find(i) µr (ii) εr (iii)β (iv) λ

(v) η

07

OR

Q.5 (a) State and prove Poynting theorem relating to the flow of energy at a point in

space in an electromagnetic field. 07

(b) A certain signal generator produces a uniform plane wave in free space

having a wavelength of 12 cm.When the propagates through a lossless

material of unknown wavelength,its wavelength reduces to 8 cm.The E

field amplitude is 50V/m and H field is 0.1 A/m. Find the generator

frequency, µr, εr of unknown material..

07

*************

1


GUJARAT TECHNOLOGICAL UNIVERSITY BE SEM-V Examination-Nov/Dec.-2011


Subject Name: Engineering Electromagnetics

Time: 2.30 pm -5.00 pm Total marks: 70

Instructions:




Q.1 (a) Define electric field intensity. Derive the expression for the intensity of

electric field due a line charge along the Z direction with uniform

charge density ρL c/m using Coulomb’s law and verify the same using

Gauss’s law.

07

(b) Express in cylindrical components: (a) the vector from C(3,2,-7) to

D(-1,-4,2); (b) a unit vector at D directed towards C; (c) a unit vector at

D directed toward the origin.

07

Q.2 (a) State and prove the Gauss’s law. Also state the conditions to be

satisfied by the special Gaussian surfaces. 07

(b) A uniform line charge density of 20 nC/m lies on the Z-axis between

Z=1 and Z=3 m. No other charge is present. Find electric field intensity

at :(a) the origin (b) P (4,0,0).

07

OR

(b) Find the total charge inside each of the volumes indicated.

(a) ρv = 10z2 e

-0.1x sinπy, -1 < x < 2, 0 < y < 1,3 < z < 3.6.

(b) ρv = 4xyz2 , 0 < ρ < 2, 0 < φ < л /2, 0 < z < 3.

(c) ρv = 3л cos2 θcos

2 φ / [2r

2 (r

2 +1)]; Universe.

07

Q.3 (a) Enlist Maxwell’s equations in integral form and explain their physical

significance. 07

(b) Derive Laplace’s and Poisson’s equations and states their key

applications. 07

OR

Q.3 (a) If V = 60sinθ / r2

volt in the free space and point P is located P(3, 600,

250).

Find (a.) Vp (b.) Ep (c.) dV/dN at P (d.) aN at P (e.) ρv at P.

07

(b) Assuming the potential function V varies as a function of ρ in

cylindrical coordinates systems ,obtain the solution of Laplace

equation and deduce the value of capacitance of a coaxial capacitor

07

Q.4 (a) Using Gauss’s law explain the concept of divergence. Prove

Divergence theorem and obtain Maxwell’s first equation 07

(b) State and explain Biot-Savart’s law. 07 OR

Q.4 (a) Explain in details the Electrostatic boundary conditions between

perfect dielectrics. 07

Q.4 (b) An aluminium conductor is 1000 ft long and has a circular cross 07

2

section with a diameter of 0.8 in. If there is a dc voltage of 1.2 V

between the ends, find : (a) the current density (b) the current (c) the

power dissipated , using your knowledge of circuit theory.

Q.5 (a) State Maxwell’s equations in point form and explain physical

significance of the equations. 07

(b) Write short note on Stoke’s theorem. 07

OR

Q.5 (a) State Ampere’s Circuital law and derive the expression for curl of

magnetic field intensity. 07

(b) Define and explain the following terms:

(i) Magnetization (ii) Polarization (iii) Skin effect and (iv) Standing

wave ratio

07

*************

1





Subject Name: Engineering Electromagnetics


Instructions:




Q.1 (a) Given points are E (2, 5, 1), F (-1, 4, -2) and G (3, -2, 4).

Find: (i) A unit vector directed from E towards F.

(ii) The angle between REF and REG.

(iii) The scalar projection REF and REG.

07

(b) (i) Find the volume defined by 4 < ρ < 6, 30°< φ < 60°,

2 < z < 5. (ii) What is the length of the longest straight line

that lies entirely within the volume? (iii) Find the total area

of the surface.

07

Q.2 (a) Find Electric field intensity due to infinite line with

uniform line charge density ρL on z-axis

07

(b) Find E at P (1, 5, 2) in free space if a point charge of 6 µC

is located at Q(0, 0, 1), a uniform line charge ρL=180 nC/m

lies along the z axis and a uniform sheet charge 25 nC/m2

lies in the plane z = -1

07

OR

(b) Given the field D = 6ρ sin(φ/2) aρ + 1.5ρ cos(φ/2) aφ C/m2.

Evaluate both sides of the divergence theorem for the

region bounded by ρ = 2, 0 < φ < 180°, 0 < z < 5.

07

Q.3 (a) Derive equation to find Energy stored in the field of a

system of charges

07

(b) The region y < 0 contains a dielectric material for which

εR1=2.5, while the region y > 0 is characterized by εR2= 4.

Let E1 = - 30 ax + 50 ay + 70 az V/m Find (i) DN2 (ii) Dt2

(iii) D2 (iv) θ2

07

OR

Q.3 (a) Find Capacitance between two concentric spheres using

Laplace Equation.

07

(b) Given a point of 200лε0 C at (3, -1, 2), a line charge of

40лε0 C/m on the x-axis and a surface charge of 8ε0 C / m2

on the plane x = -3, all in free space. Find the potential at

P (5, 6, 7) if V = 0 at Q (0, 0, 1).

07

2

Q.4 (a) Define the term “curl”. Also explain the point form of

“Ampere’s circuital law”.

07

(b) Write the statement of Stoke’s theorem.

Evaluate both sides of Stoke’s theorem for the field

H = 6xy ax - 3y2 ay A / m and the rectangular path around

the region, 2 ≤ x ≤ 5, – 1 ≤ y ≤ 1, z = 0. Let the positive

direction of dS be az.

07

OR

Q.4 (a) Prove that for a differential current loop which carries

current I in a given magnetic field, the torque on that loop

is given by dT = dm × B.

07

(b) As shown in the figure below, the finite length current

element is on the z – axis. Using Bio–savart law show that

H = I / 4πρ (sinα2 - sin α1) aφ.

07

Q.5 (a) Derive Maxwell’s four equations in point form. 07

(b) Explain Skin effect in detail. A steel pipe is constructed of

a material for which µ r = 200 and σ = 5 X 106 mho/m. The

outer and inner radii 8 and 6 mm respectively and the

length is 80 m. If the total current carried by the pipe is

2cos104πt A, find (i) the skin depth (ii) the effective

resistance

07

OR

Q.5 (a) Derive Maxwell’s four equations in integral form. 07

(b) A lossy dielectric is characterized by εr = 2.5, µ r = 4, and

σ = 10-3

mho/m at 10MHz. Let Es = 20 e-yz ax V/m and

find (i) α (ii) η (iii) Hs

07

*************

1/2



Subject code: 151002 Date: 17-01-2013 Subject Name: Engineering Electromagnetic Time: 02:30 pm to 05:00 pm Total Marks: 70 Instructions:


Q.1 (a) With the help of neat sketches, briefly explain the cylindrical coordinate

system. Also give the dot table relating to the vectors in cylindrical coordinate & rectangular coordinate systems & justify.

07

(b) Solve the followings. 07 1) The vector from the origin to point A is given as (6, -2, -4) and the unit

vector directed from the origin toward point B is (2, -2, 1)/3. If point A and B are ten units apart, find the coordinates of point B.

2) Transform the given vector A=10 az into spherical coordinates at Point P (r=4, θ=110˚, Ø=120˚).

Q.2 (a) Describe the experimental law of Coulomb. Also define Electric Field

Intensity & Derive the expression for electric field intensity E due to infinite & uniform line charge ρL located on the z axis.

07

(b) Three infinite uniform sheets of charges are located in the free space as

Follows: 3 nC/m2 at z = -4, 6 nC/m2 at z = 1, and -8 nC/m2 at z = 4. Determine the E at the point P (4, 2, -3) & Q (-1, -5, 2).

07

OR (b) An electric field is expressed in rectangular coordinates by E =

6x2 ax + 6y ay + 4 az V/m for points M (2, 6, -1) & N (-3, -3, 2). Determine potential

a) VMN b) VN if V = 2 at P(1, 2, -4)

07

Q.3 (a) Define displacement flux. Also state & prove Gauss’s law. 07

(b) Define volume charge density & divergence. And obtain volume charge

density ρv at the point specified by P(ρ = 2, Ø = 110˚, z = -1) for D = (2 ρ z2

sin2Ø) aρ + (ρ z2 sin2Ø) aØ + (2 ρ2 z sin2Ø) az

07

OR Q.3 (a) Explain term current density. Also explain the boundary conditions for

perfect dielectric materials. 07

(b) What is an electric dipole? Derive the expression for electric field intensity E

at distant point due to a +Q & -Q charge located d unit apart from origin. 07

Q.4 (a) Derive equation to find the energy stored in the field of a system of charges. 07

(b) Explain uniqueness theorem in brief. Also derive the expression of E if

boundary conditions for two radial planes are given by V = 0 at Ø = 0 and V 07

2/2

= V0 at Ø = α. OR

Q.4 (a) Define magnetic flux & magnetic field intensity. Also explain Magnetic boundary conditions in brief.

07

(b) State Stoke’s theorem. Evaluate both side of stokes theorem for the field H =

(6 r sinØ) ar + (18 r sinθ cosØ) aØ , surface specified by r=4, 0 ≤ θ ≤ 0.1 π , 0 ≤ Ø ≤ 0.3 π .

07

Q.5 (a) State ampere’s circuital law & derive the expression for curl of magnetic

field intensity. 07

(b) State & prove Poynting theorem relating to the flow of energy at a point in

space in an electromagnetic field. 07

OR Q.5 (a) State Maxwell’s equations in point form & explain physical significance of

the equations. 07

(b) Write Short note on the followings.

1) Skin effect 2) The retarded potentials

07

*************

1



Subject Code: 151002 Date: 21-05-2013 Subject Name: Engineering Electromagnetic Time: 10.30 am - 01.00 pm Total Marks: 70 Instructions:


Q.1 (a) Explain Cross Product & Dot Product in detail. 04 (b) Explain Position and distance vectors with suitable example. 04 (c) Define followings: 1. Electric Flux Density 2. Potential 3. Field 06

Q.2 (a) Given vectors A = 3ax + 4ay + az and B = 2ay - 5az, find the angle between A and B. 04 (b) Given point P (—2, 6, 3) and vector A = yax + (x + z) ay, express P and A in

cylindrical and spherical coordinates. Evaluate A at P in the Cartesian, cylindrical, and spherical systems.

07

OR (b) Explain spherical coordinate system. 07 (c ) Explain Coulomb's Law and Field Intensity with suitable example. 03

Q.3 (a) Given the potential V = 10/r2sinθcosφ (1) Find the electric flux density D at (2, π/2, 0). (2) Calculate the work done in moving a 10 µC charge from point A (l, 30°, 120°) to B (4, 90°, 60°).

06

(b) Write short notes on potential gradient. Find the gradient of the following scalar field = e-z sin 2x cosh y.

05

(c ) Explain the Electric Dipole. 03 OR

Q.3 (a) Write a short note on Divergence Theorem with suitable example 04 (b)

Prove that ; Continuity of current equation.

06

(c ) Write down a Point and integral forms of Maxwell’s equations for steady electric and magnetic fields.

04

Q.4 (a) Determine magnetic Field intensity H for Infinitely Long Coaxial Transmission Line. 07 (b) Write down a statement of Biot-Savart's law and explain in detail 07 OR

Q.4 (a) write short notes on magnetic boundary conditions 06 (b) A parallel-plate capacitor with plate area of 5 cm2 and plate separation of 3 mm has a

voltage 50 sin 103tV applied to its plates. Calculate the displacement current assuming ε = 2εo.

04

(c ) What do you mean by skin depth? Explain in brief. 04 Q.5 (a) The electric field in free space is given by E = 50 cos (108t + β x) ay V/m

(1) Find the direction of wave propagation. (2) Calculate β and the time it takes to travel a distance of λ/2.

07

(b) Write down a general procedure for solving poisson's or laplace's equation & also explain a Uniqueness theorem.

07

OR Q.5 (a) Explain plane waves in free space. 07

(b) In free space (z ≤ 0), a plane wave with H = 10 cos (108t - βz) ax mA/m is incident normally on a lossless medium (ε = 2εo, μ = 8μo) in region z ≥ 0. Determine the reflected wave Hr Er and the transmitted wave Ht, Et.

07

1





Subject Name: Integrated Circuits and Applications Date: 16 /12 /2010 Time: 03.00 pm - 05.30 pm

Total Marks: 70




4. Take VCC = +10 V and VEE = -10 V as supply voltage for op-amp.

Q.1 (a) Which type of feedback is used in inverting op-amp? Derive exact expressions for

voltage gain, input resistance, output resistance and bandwidth for inverting op-amp. 07

(b) Explain following terms related to op-amp:

1. CMRR, 2. PSRR, 3. Slew Rate, 4. Channel separation in multiple op-amps IC, 5.

Equivalent input noise voltage and current, 6. Input offset current, 7. Input offset

voltage

07

Q.2 (a) Draw circuit diagram of differential amplifier with two op-amps and derive expression

for its output signal as a function of input signals. Also derive expressions of input

resistance faced by each input signal.

07

(b) Design input offset voltage-compensating network for non-inverting op-amp which has

a gain 11 and feedback resistance of 10 KΩ. The op-amp used in non-inverting op-

amp has an input offset voltage of 10 mV.

07

OR

(b) For the inverting amplifier which has a gain of 100 and feedback resistance of 47 KΩ,

determine the maximum possible output offset voltage due to: 1. Input offset voltage,

and 2. Input bias current. Determine the value of ROM (offset minimizing resistance) to

reduce the effect of input bias current. The required op-amp parameters are: maximum

value of input offset voltage = 6 mV dc and maximum value of input bias current =

500 nA.

07

Q.3 (a) Explain with necessary diagrams the working of AC amplifiers (inverting and non-

inverting) with single supply voltage. 07

(b) Design an op-amp based practical differentiator circuit to differentiate an input signal

that varies in frequency from 10 Hz to 1 kHz. Draw output waveform of the designed

differentiator circuit for an input signal with 2 V peak-to-peak amplitude with 1 kHz

frequency.

07

OR

Q.3 (a) Draw and explain working op-amp based full-wave rectifier circuit. How is it better in

performance compared to full-wave rectifier circuit without op-amp? 07

(b) In a differential instrumentation amplifier with transducer bridge to measure change in

temperature, show that the output voltage of entire system (circuit) is proportional to

change in resistance of temperature sensor.

07

Q.4 (a) Explain working of 555 timer based monostable multivibrator. Design the same

for the output pulse width of 10 ms.

07

(b) Describe working principle of phase-locked loop electronic system and discuss

its application as a frequency multiplier.

07

OR

Q.4 (a) What are the different types of voltage regulators? Discuss LM317 based

adjustable voltage regulator. Indicate bypass capacitors to improve transient

response and protective diodes in the connection diagram.

07

2

(b) Which type of feedback is used in Schmitt trigger circuit? Discuss its operation

and derive expressions for lower and upper threshold voltage. Design the

Schmitt trigger circuit for upper and lower threshold voltage equal to 25 mV

and -25 mV. Op-amp maximum output voltages are ± 14 V. Take ± 15V as op-

amp supply voltage.

07

Q.5 (a) Discuss importance of magnitude and frequency scaling in filter design. Design

Biquad lowpass filter whose poles in normalized s-plane are located at -0.577 ±

j0.8165. The dc gain is 2. The frequency is to be scaled by 20,000 rad/sec. Find

the values of pole frequency and pole quality factor and design a circuit to

realize the specifications.

07

(b) Derive transfer function of Sallen-key lowpass filter. 07

OR

Q.5 (a) Design a Delyiannis-Friend circuit with f0 = 12.5 kHz, Q0 = 10, and midband gain H

= 26 dB.

07

(b) Draw simple internal diagram of operational transconductance amplifier and

show that its output current is proportional to difference of input voltages.

07

*************

1



Subject code 151003

Subject Name: Integrated Circuits and Application Date:24/06/2011 Time: 10:30 am – 01:00 pm Total Marks: 70




Q.1 (a) (i) List three types of linear IC packages.

(ii) What is the major difference among SSI ,MSI , LSI and

VLSI ICs?

(iii) List three open loop op-amp configurations.

(iv) Why open loop op-amp configuration are not used in

linear application?

(v) List the four negative feedback configuration

(vi) Which are the two special cases of inverting amplifier?

(vii) Why is it necessary to use an external offset voltage compensating

network with practical op-amp circuits?

07

(b) (i) Explain briefly the characteristics of an ideal op-amp.

(03)

(ii) Define the following electrical parameters of op-amp:

Input offset voltage , Output offset voltage (04)

Input bias current , CMRR

07

Q.2 (a) Explain application of op-amp (Inverting configuration) as summing,

scaling and averaging circuit. 07

(b) Draw the circuit of basic integrator using an op-amp. What are the

problems associated with this configuration? How they are overcome? 07

OR

(b) Write short note on: (i) sample and hold circuit

(ii) comparator circuit using op-amp 07

Q.3 (a) Derive the expression for voltage gain , input resistance, output resistance

and bandwidth of an inverting amplifier using op-amp with negative

voltage shunt feedback.

07

(b) (i)What is thermal drift? How does it affect the performance of an op-amp

circuit?

(ii) What is error voltage? How can it be reduced?

07

OR

Q.3 (a) Design a differentiator to differentiate an input signal that varies in

frequency from 10 Hz to about 1 KHz. Draw its frequency response. 07

(b) Draw the circuit of Peaking amplifier. If the gain is 10 at peak frequency of

16 KHz then calculate the values of all components of the circuit. 07

Q.4 (a) Design first order low pass Butterworth filter at cut-off frequency of 1 KHz

with pass band gain of 2.Draw circuit with component value. 07

(b) Design a wide band-reject filter having high cut off frequency of 200 Hz

and low cut off frequency of 1 KHz. 07

2

OR

Q.4 (a) Explain wide band-pass filter with necessary circuit, derivation and

waveforms 07

(b) Draw and explain Triangular and Sawtooth wave generator circuit using

op-amp. 07

Q.5 (a) Design an adjustable voltage regulator using LM317

to satisfy the following specification:

Output voltage Vo = 5 to 12 V

Output current Io = 1 A

07

(b) State the applications of operational transconductance amplifier and explain

any one with necessary circuit and derivation 07

OR

Q.5 (a) What is PLL? Explain operation of PLL with basic blocks and mention any

four applications of it in radio communication. 07

(b) Explain working of monostable multivibrator using IC 555 with

internal blocks. Mention applications of monostable and astable

multivibrator using 555 timer

07

*************

1




Subject Name: Integrated Circuits and Application

Time: 02.30 pm-05.00 pm Total marks: 70

Instructions:




Q.1 (a) (i)Draw and explain the block diagram of Op-Amp.

(ii)What are the characteristics of an ideal op-amp? Draw its equivalent

circuit along with voltage transfer curve.

07

(b) Derive the formula for voltage gain, input resistance, output resistance

and bandwidth for voltage series feedback amplifier using op-amp.

07

Q.2 (a) Explain the application of op-amp as a subtractor and summing

amplifier using differential configuration.

07

(b) The op-amp is used as an inverting amplifier, with the following

specifications:

T

Vio

∆

∆ = 30µV/ ºC,

T

Iio

∆

∆ = 10 nA/ ºC, Vs = ±15V

R1 = 100 Ω, RF = 8.2 kΩ, RL = 10k Ω .

Assume that the amplifier is nulled at 25 ºC. If Vin is a 20mV peak

sine wave at 100Hz:

(a) Calculate Ev and Vo values at 45°C.

(b) Draw the output voltage waveform at 25°C and 45°C.

07

OR

(b) Design an input offset voltage compensating network for the inverting

amplifier with R1 = 100Ω and RF = 4.7 kΩ. The op-amp is LM307 with

Vio = 10 mV and supply voltages ± 10V.

07

Q.3 (a) Explain with necessary diagrams the working of Absolute value output

circuit.

07

(b) Explain the following application of op-amp.

(1) Small signal Half wave rectifier

(2) Peak Detector

07

OR

Q.3 (a) Explain the application of op-amp as a positive and negative clipper

circuit.

07

(b) Explain how op-amp can be used as a differentiator. Discuss the

sources of error. Draw and explain practical differentiator circuit.

07

Q.4 (a) Explain working of astable multivibrator using IC 555. Design the

same for the output frequency of 10 kHz with a duty cycle of 25%.

07

(b) Draw and explain square wave generator using op-amp. 07 OR

2

Q.4 (a) Using the LM 317, design an adjustable voltage regulator to satisfy the

following specifications: output voltage Vo = 10 to 12V and Io = 200

mA. For LM 317, IADJ = 100 µA. Draw the complete schematic

diagram of the designed regulator.

07

(b) Describe the working principle of phase-locked loop with basic blocks.

Discuss its application as a frequency multiplier.

07

Q.5 (a) Write short note on Sallen key circuit. 07

(b) Design a Biquard bandpass filter with a center frequency of wo = 1000

rad/s and a bandwidth of 200 rad/s. The midband gain H = 1.

07

OR

Q.5 (a) For the following set of Butterworth LPF specifications.

αmax = 0.5 dB , αmin = 20 dB,

Wp =1000 rad/sec, Ws = 2000 rad/sec

Determine :

(1) Order of Butterworth LPF

(2) Pole locations and corresponding Qs

(3) Half Power frequency

07

(b) List the applications of Operational tranconductance amplifier. Explain

its application as a current controlled Integrator.

07

*************

1





Subject Name: Integrated Circuits and Applications


Instructions:




Q.1 (a) Explain all the three open loop Op-Amp configurations. 06

(b) Consider the Sallen Key low pass circuit for gain K=1, which is to be

designed to realize a pair of poles at the angles ±Ψ with respect to negative

real axis of S plane. If R1=R2=1, show that 2

1

C

CψCos = .

04

( c) Draw the high frequency model of an Op-Amp and Obtain the expression

for the open loop gain as a function of frequency.

04

Q.2 (a) Define slew rate of an Op-Amp .What are its causes? 03

(b) Derive the expression for the closed loop voltage gain, input resistance and

output resistance of voltage series feedback amplifier.

07

OR

(b) Implement an integrator using Op-Amp. Obtain the expression for the

output voltage V0.Sketch the output waveform for an input square

waveform. Show the frequency response of an ideal and a practical

integrators

07

(d) Define the following parameters of Op-Amp:

(i) Input bias current

(ii) Common Mode Rejection ratio

(iii) Supply Voltage rejection ratio.

(iv) Output offset voltage

04

Q.3 (a) Explain the working of a Voltage to Current converter with floating load.

Illustrate the application of this circuit as a Zener diode tester. 07

(b) Show how Op-Amp can be used as an averaging,summing amplifiers using

noninverting configuration.

04

(c) State the properties of Butterworth filter 03

OR

Q.3 (a) Explain the application of Op-Amp as :

(i) Peaking Amplifier (ii) Schmitt Trigger

07

(b) Explain the operating principle of a Phase Locked Loop. 07

Q.4 (a) Explain with a neat circuit diagram and waveforms,the operation of a

monostable multivibrator using 555 timer .

04

(b) Determine the following for the low pass specifications below:

αmax=0.5 dB,αmin= 30 dB.ωp=1000 rad/s,ωs=2330 rad/s.

(a) The order of the filter ‘n’

(b) S plane location of the poles

(c) Q of each pole.

(d) ω0

08

( c) Name the different types of voltage regulators 02

2

OR

Q.4 (a) Draw the circuit diagram of triangular waveform generator and explain the

operation with necessary equations and waveforms.

07

(b) Show how four Op-Amp Biquad circuit can be used as a universal filter.

Derive the expression for the transfer function, and plot the magnitude

response,pole-zero locations for all types of filter.

07

Q.5 (a) Draw and explain the block diagrams of (i) Operational amplifier (ii) 555

timer

08

(b) For an astable multivibrator using 555 Timer, RA=4.7KΩ, RB=1KΩ,and

C=.05µF,determine the positive pulse width, negative pulse width and the

free running frequency.

06

Q.5 (a) Using LM 317, design an adjustable voltage regulator to satisfy the

specifications :V0=10 to 15 volts,I0=0.5A,Choose R1=200Ω.Neglect IAdj

04

(b) Draw the Deliannnis –Friend circuit and derive the transfer function.

Express ω0 ,bandwidth and Q in terms of circuit parameters.

06

( c) Discuss the attenuation characteristics of ideal and practical low pass and

bandpass filters

04

*********************

1



Subject code: 151003 Date: 12-01-2013 Subject Name: Integrated Circuits and Applications Time: 02:30 pm to 05:00 pm Total Marks: 70 Instructions:


Q.1 (a) What is the difference between active and passive filters? Classify filters

based on roll off factors, operating range, and frequency response. 07

(b) Draw block diagram of XR 2206 function generator IC and describe function of internal blocks. Also state its applications.

07

Q.2 (a) Explain the requirement of Instrumentation amplifier along with its

advantage and discuss one of its applications in detail. 07

(b) Prove that output is the integral of input for the given Fig.1

Fig.1

07

OR (b) What is the limitation of the basic differentiator circuit? Discuss practical

differentiator circuit with necessary derivations and frequency response. 07

Q.3 (a) What is the limitation of basic log amplifier? Explain the remedy for the

same and prove it. 07

(b) Derive Vo=K1+(a+b) R1/R(V2-V1) for the Fig.2 shown below.

Fig.2

07

ORQ.3 (a) Explain Schimitt trigger circuit along with circuit diagram and necessary

waveforms. State its advantages and applications. 07

(b) For the given Fig.3 prove that IL=-2V1/R1 if R1+R2=R1’ 07

2

Fig.3

Q.4 (a) Design a 1.5 KHz low pass second order butterworth filter. Use the Sallen

and Key equal component model. Assume the damping factor to be 1.414 07

(b) Explain triangular wave generator circuit. 07 OR

Q.4 (a) Analyze second order butterworth High Pass filter. Draw its frequency response and state design procedure.

07

Q.4 (b) Design a circuit shown in Fig.4 to work as positive full wave rectifier.

Fig.4

07

Q.5 (a) Draw and explain Monostable multivibrator using 555 timer IC. 07

(b) Discuss magnitude and frequency scaling in filter design. 07 OR

Q.5 (a) Write a short note on PLL 07 (b) Design an astable multivibrator for an output frequency of 5 KHz and

duty cycle 40%.Consider C=0.047 µF. 07

*************

1



Subject Code: 151003 Date: 16-05-2013 Subject Name: Integrated Circuits and Applications Time: 10.30 am - 01.00 pm Total Marks: 70 Instructions:


Q.1 (a) 1. Draw block diagram of a typical op-amp and explain functions of each block.

2. Define followings for an op-amp: (i) input offset current (ii) CMRR (iii) Differential input resistance.

04 03

(b) What type of feedback is present in the non-inverting amplifier? Derive expression for voltage gain, input resistance, output resistance and bandwidth of a non-inverting amplifier using a non ideal op-amp.

07

Q.2 (a) 1. Draw inverting amplifier. Determine the maximum output offset voltage

due to (i) input offset voltage Vio and (ii) input bias current IB. Take Vio max = 6 mV dc, IB max = 500 ηA dc, Vs = ± 15 V, RF = 47 kΩ and R1 = 470 Ω.

2. What is slew rate? List causes of slew rate. Also explain its significance in applications.

04 03

(b) Draw peaking amplifier specify the value of all components to provide a gain of 10 at a peak frequency of 16 KHz. Take L = 10 mH with internal resistance of 30 Ω.

07

OR (b) What is an instrumentation amplifier? Explain with the help of neat

diagram the operation of an instrumentation amplifier employing three basic op-amps and with provision for variation in the voltage gain.

07

Q.3 (a) Draw the non-inverting Schmitt trigger comparator circuit and explain the

threshold levels and hysteresis. 07

(b) Draw asymmetrical square-wave generator circuit using op-amp. Specify suitable component value for the following specification: TON = 1 sec. TOFF = 2 sec. Assume value of ß = 0.1 and C = 100 µF.

07

OR Q.3 (a) Explain in detail operation of full-wave precision rectifier with neat

diagram and waveform. 07

(b) Draw basic log amplifier using a transistor. Derive the expression for output voltage. Also state disadvantages of circuit.

07

Q.4 (a) Design second order Butterworth low pass filter with – 3 dB

frequency of 10 KHz. Choose C = 1 ηF. ( Use equal component KRC filter circuit)

07

(b) With the help of a circuit diagram explain the operation of first order high-pass filter.

07

OR

2

Q.4 (a) Design a wide-band band pass filter using a single op-amp for fL = 100 Hz, fH = 1 KHz and pass band gain of 4. Also calculate the value its quality factor Q.

07

Q.4 (b) Derive the expression for filter transfer function of a first order low-pass filter and draw its frequency response characteristics.

07

Q.5 (a) Design a free running ramp generator using IC 555 for Vcc=10 V, C=

0.1µF and period T= 2 ms. Take transistor with ß = 100. Explain its working.

07

(b) Draw block diagram of the PLL system and explain function of each block. State the applications of PLL.

07

OR Q.5 (a) Draw circuit diagram of an astable multivibrator using IC 555 and explain

its operation. Derive expression for frequency of operation and duty cycle. 07

(b) Draw block diagram of a basic SMPS and explain it. Also state advantages and disadvantages of SMPS.

07

*************




Subject code: 151004 Subject Name: Electronic Communication Date: 18 /12 /2010 Time: 03.00 pm - 05.30 pm

Total Marks: 70

Instructions: 1. Attempt all questions. 2. Make suitable assumptions wherever necessary. 3. Figures to the right indicate full marks.

Q.1 (a) What is modulation? Why modulation is required? Describe in detail. 07

(b) What is Phase Locked Loop? Draw the block diagram of Frequency Synthesizer

using PLL and explain its operation in detail. 07

Q.2 (a) Draw the block diagram of super heterodyne AM receiver and explain its

operation in detail 07

(b) Draw the block diagram of super heterodyne FM receiver and explain its

operation in detail. 07

OR

(b) What do you mean by AGC? Draw the circuit diagram of delayed AGC and

explain its operation. What are the advantages of delayed AGC? 07

Q.3 (a) Draw parallel tuned circuit and derive the equation for resonant frequency and

Q factor. 07

(b) Draw the circuit diagram of high frequency Transformer and derive the

equation for transfer impedance. 07

OR

Q.3 (a) Draw the circuit diagram of low frequency Transformer and derive the equation

for reflected load. 07

(b) Describe briefly shot noise, partition noise and flicker noise. Why they are

generated? 07

Q.4 (a) Two resistors 10 kΩ and 25 kΩ are at room temperature (290K) for a

bandwidth of 150kHz.Calculate thermal noise for each resistor, if two resistors

are in series and if two resistors are in parallel.

07

(b) Draw the block diagram of Tuned Radio Frequency (TRF) Receiver and

explain its operation. Describe the problems in TRF receiver. 07

OR

Q.4 (a) The RF amplifier working at 10 MHz has a bandwidth of 200 kHz. The input

resistance of the stage is 1 kΩ with an equivalent shot noise resistance of 2

kilo-ohms. The receiver is connected to a 10 µV,75Ωsource.Calculate

(1)equivalent noise voltage (2) Noise figure of the stage.

07

(b) With respect to receivers explain Image rejection and double spotting in detail. 07

Q.5 (a) Describe the following properties of Fourier transform:

(1)Time scaling(2)Frequency shifting 07

(b) With figures explain Bandwidth efficient AM (SSB-SC). 07

OR

Q.5 (a) What do you mean by Tracking? Explain with figures: Padder Tracking,

trimmer tracking and Three points tracking. 07

(b) The frequency span to be received by a receiver is from 525 kHz to 1650 kHz.

If Cmin of tuning circuit is limited to 50 pF, Calculate the value of padder

capacitor, if the maximum value of variable capacitor is 450 pF. The IF used is

465 kHz.

07

*************

1




Subject Name: Electronic communication Date:27/06/2011 Time: 10:30 am – 01:00 pm

Total Marks: 70




Q-1 (a) Draw block diagram of superheterodyne receiver and explain function of each block. 07

(b) Explain Armstrong method of FM generation with neat diagram. 07

Q-2 (a) State and prove any three properties of Fourier transform. 07

(b) Explain different types of noise related to communication. 07

OR

(b) Discuss Noise factor. Derive expression for noise factor of amplifier connected in

cascade.

07

Q-3 (a) Explain Tracking and Adjacent channel selectivity. 07

(b) Explain double conversion superheterodyne receiver with neat diagram. 07

OR

Q-3 (a) What do you understand by image frequency and its rejection?

For a receiver with IF and RF frequency of 455 KHz & 950 KHz respectively

determine:

(i) local oscillator frequency

(ii) image frequency

(iii) image frequency rejection ratio. take Q=70.

07

(b) Explain AGC and discuss difference between simple AGC and Delayed AGC. 07

Q-4 (a) Draw and discuss schematic diagram for FDM system to combine 4 voice channels

each occupies a bandwidth of 6KHz. The common voice channel has a bandwidth of

24 KHz. (Band- 200 to 224 KHz).

07

(b) Explain phase locked loop and vestigial sideband transmission. 07

OR

Q-4 (a) Derive the expression for AM wave. AM modulating signal 8sin (2π x 900t) is used to

modulate a carrier signal 18 sin (2π x 15000t). Find modulation index, percentage

modulation, frequencies of sideband components and their amplitude. Draw the

spectrum of AM wave.

07

(b) Discuss the following:

(i) Energy spectral density

(ii) Power spectral density

(iii) Essential bandwidth of a signal

07

Q-5 (a) Discuss basic principle of FM detection and Explain foster seeley discriminator with

neat diagram.

07

(b) For the periodic signal shown in fig. 1. Find compact trigonometric fourier series and

sketch amplitude spectra.

07

2

OR

Q-5 (a) Give comparison of FM and PM systems.

In FM system, the modulating frequency is 500Hz & modulating voltage is 3.6V with

modulating index 65. Calculate maximum frequency deviation. What will be the

modulation index when modulating frequency is 235Hz and modulation voltage is 5V?

07

b) Find Fourier transform of following:

(i) rect (t/τ)

(ii) e-7|t|

07

*************

1




Subject Name: Electronic Communication

Time: 02.30 am-05.00 pm Total marks: 70

Instructions:




Q.1 (a) Explain channel effect in detail with their resources. Also explain

nyquist information rate and channel capacity in detail

07

(b) Give classification of electronics communication system by every

aspects and explain them in short.

07

Q.2 (a) Draw and explain parallel tuned circuits in detail. Also derived

equation for Resonance frequency and Q-factor for the parallel tuned

circuits.

07

(b) A coil has a series resistance of 5ῼ, a self capacitance of 7 pF, and an

inductance of 1µH. Determine the effective inductance and effective

Q-factor when coil forms part of series tuned circuits resonant at 25

MHz.

07

OR

(b) The equivalent noise resistance of an amplifier is 300 ῼ and

equivalent shot noise current is 5µA. The amplifier is fed from 150 ῼ

and 10µV rms sinusoidal signal source. Calculate the individual noise

voltage at the input and the input Signal to Noise ratio in decibels.

The noise bandwidth is 10 MHz.

07

Q.3 (a) What is Signal to Noise ratio ? Derived equation for Signal to noise

ratio for amplifier.

07

(b) What is Noise temperature and Noise factor ? Also derived the

equation for Noise factor of amplifier in the cascading stages

07

OR

Q.3 (a) Draw the block diagram of a double conversion receiver and explain

each blocks in detail. Also list the additional circuits used to improve

performance of communication receiver.

07

(b) List the standard continuous time and discrete time signal and explain

them with neat sketches.

07

Q.4 (a) List the properties of Fourier transform and prove any two of them in

detail

07

(b) A carrier current is 8A but it is increase to 8.93A when it is

modulated Find,

(A) percentage modulation Index

(B) Antenna current when modulation index changes

To 0.8

07

OR

2

Q.4 (a) Explain Amplitude Modulation with required waveforms. Also give

mathematical representation of Amplitude modulated Wave.

07

(b) A FM voltage is represented by v=12sin(6 x 108 t + 5cos 1250t)

Find

Carrier Frequency, Modulating Frequency, Modulation Index,

Maximum Deviation, Power dissipation across 10ῼ.

07

Q.5 (a) List different types of Amplitude Modulated Signal and explain them

in detail.

07

(b) What are the complexity remains in SSB ? List the methods of

generation of SSB signal and explain any two of them.

07

OR

Q.5 (a) What is FM ? Give relation between FM and PM. Also give

difference between AM and PM.

07

(b) List all the basic FM demodulators, Draw and explain Foster seeley

discriminator in detail.

07

*************

1





Subject Name: Electronics Communication


Instructions:




Q.1 Answer the following

(i) Draw the block diagram of the basic

communication system

(ii) What is modulation and why modulation is required

in communication?

(iii)Define : Amplitude modulation

Frequency modulation

(iv) Explain briefly : Noise factor

Signal to Noise ratio

(v) Define : Figure of merit ( Q- factor )

Resonance frequency

(vi) Why IF is generated at receiver? List the factors

influencing the choice of IF for radio receiver.

(vii) Write difference between FM and AM receivers

14

Q.2 (a) Draw and explain block diagram of the Superhetrodyne

Receiver with necessary waveforms

07

(b) Draw and explain working of parallel tuned circuit. Derive

expression for resonance frequency, Q-factor and

impedance of parallel tuned circuit.

07

OR

(b) A high frequency transformer has identical primary and

secondary circuits for which Lp = Ls = 150 µH , Cp = Cs =

470 pF and the Q-factor for each circuit alone is 85. The

co-efficient of coupling is 0.001.The load resistance is

5000Ω and the constant current source feeding the

transformer has an internal resistance of 75Ω. Calculate the

transformer impedance at resonance.

07

Q.3 (a) What are the natural sources of noise? Explain Shot noise,

Partition noise and Flicker noise. 07

(b) Two resistance of 20KΩ and 50 KΩ are at room

temperature (290K). For a bandwidth of 100 kHz ,calculate

the Thermal noise voltage generated by (i) each resistor

(ii) the two resistors in series (iii) the two resistors in

parallel

07

2

OR

Q.3 (a) What tracking means in a superhetrodyne receiver? Explain

three points tracking in radio receiver. 07

(b) What is image frequency? An AM broadcast receiver has

an IF of 465 kHz and tuned to 1000 kHz and the RF stage

has one tuned circuit with Q of 50. Calculate image

frequency and image rejection in decibels.

07

Q.4 (a) (i)What advantages are of transform techniques? Write

properties of Fourier Transform with their equations. (03)

(ii) Explain briefly : (04)

signal energy and energy spectral density

signal power and power spectral density

07

(b) Draw and explain block diagram of double conversion

superhetrodyne receiver with RF and IF stage response

curve

07

OR

Q.4 (a) Compare DSB and VSB techniques for amplitude

modulation with necessary waveforms and derivations. 07

(b) What are the different methods for generation of SSB

signals? Explain SSB generation by phase shift method

with necessary block diagram and derivations.

07

Q.5 (a) Compare and Contrast following :

Wideband and narrowband FM

Frequency modulation and phase modulation

07

(b) Draw only block diagram of Armstrong indirect FM

transmitter and discuss the nature of distortion inherent in

Armstrong indirect FM generator.

07

OR

Q.5 (a) (i) Define following for FM : (02)

Frequency deviation , Modulation index

Deviation ratio , Percentage modulation

(ii) An angle-modulated signal with carrier frequency

ωc = 2π × 105 is describe by the equation (05)

φEM (t) = 10Cos(ωct + 5 Sin3000t +10 Sin2000πt)

Calculate power of the modulated signal , frequency

deviation , deviation ratio , phase deviation ratio and

estimate the bandwidth of φEM (t)

07

(b) (i) Sketch φEM (t)

for modulation indices µ = 0.5,

m(t) = BCos ωmt. Determine η and percentage of total

power carried by sidebands of the AM waves for tone

modulation

(ii) Draw and explain circuit of envelope detector for AM.

07

.

**********

1

Seat No.: ________ Enrolment No._________ GUJARAT TECHNOLOGICAL UNIVERSITY

BE – SEMESTER V • EXAMINATION – WINTER - 2012 Subject code: 151004 Date: 16-01-2013 Subject Name: Electronic Communication Time: 02:30 pm to 05:00 pm Total Marks: 70 Instructions:


Q.1 (a) An FM wave is given by e(t) = 20sin (6 × 108 t + 7sin1250 t).

Determine (i) The carrier frequency (ii) Modulating frequency (iii) The modulation index (iv) The maximum deviation.

07

(b) The noise figure of a receiver is 20dB and it is fed by a LNA which has a gain of 40dB and noise temperature of 80 oK. Calculate the overall noise temperature of the receiver system and the noise temperature of the receiver.

07

Q.2 (a) Define Superhetrodyne principal. Draw the superhetrodyne receiver block diagram with signal spectra and briefly explain each block.

07

(b) With related to Amplitude modulation discuss following parameters (i) Modulation index (ii) Modulation depth (iii) Bandwidth requirement

(iv) Power distribution in sidebands and carrier

07

OR (b) A series tuned circuit has a Q of 130 and a tuning capacitance of 250pF and is

resonant at 450kHz. Determine (i) the impedance at resonance, and (ii) the relative response of circuit at a frequency of 400 kHz.

07

Q.3 (a) List the methods used to generate SSB modulation signal. Discuss any one method in detail.

07

(b) Explain the working of amplitude demodulator circuit with the remedy for avoiding diagonal peak clipping and negative peak clipping.

07

ORQ.3 (a) Define noise factor. Drive the Friis’s formula for noise factor when amplifiers

are in cascade connection. 07

(b) Define the energy spectral density. Estimate the essential bandwidth W rad/s of the signal e –at u(t) if the essential band is required to contain 97% of the signal energy.

07

Q.4 (a) Define the unit impulse signal. Find the Fourier transform of unit impulse signal and sinusoidal signal cos 2πfo

07

(b) Write a short note on Automatic Gain control in Superhetrodyne receiver. 07 OR

Q.4 (a) Discuss the importance of Pre-emphasis and De-emphasis circuits in FM broadcasting..

07

Q.4 (b) Discuss the basic principal of FM detection and explain Foster-seeeley Discriminator.

07

Q.5 (a) Find the equation for resonant frequency and -3db bandwidth in parallel tuned circuit.

07

(b) State the Parseval’s theorem. Prove it for the signal : g(t) = e –at u(t) (a > 0). 07 OR

Q.5 (a) State and prove the following Fourier transform properties (i) Time-Scaling property, (ii) Time integration property.

07

(b) Explain briefly what is meant by skin effect and why it is undesirable. What steps may be taken to reduce skin effect in inductors?

07

*************

1



Subject Code: 151004 Date: 20-05-2013 Subject Name: Electronic Communication Time: 10.30 am - 01.00 pm Total Marks: 70 Instructions:


Q.1 (a) Derive Friiss formula for noise factor of cascaded amplifier.

07

(b) Prove that ESD of any signal g(t) is the fourier transform of the autocorrelation function Rg(ح).

07

Q.2 (a) Draw the circuit diagram of capacitive tap and derive the equation for

transfer impedance.

07

(b) Explain Double-conversion superhetrodyne receiver using block diagram. 07 OR

(b) Explain Automatic Gain Control using necessary circuit diagram. 07

Q.3 (a) With the help of neat diagram and waveform explain the operation of envelop detector.

07

(b) Explain the indirect method of FM generation. (Armstrong method). 07 OR

Q.3 (a) Draw the circuit diagram of ring modulator using diode and explain its operation.

07

(b) Explain FM detection using PLL.

07

Q.4 (a) state and prove the following properties of Fourier transform:

(1) Time shifting (2) Frequency shifting 07

(b) An audio signal 15sin2ᴨ (1500t) amplitude modulates a carrier 60 sin2ᴨ (100,000t). i) Sketch the audio signal. ii) Sketch the carrier. iii) Construct the modulated wave. iv) Determine the modulation index and percentage modulation. v) What are the frequencies of the audio signal and the carrier?

07

OR

2

Q.4 (a) Determine the fourier transform of rectangular pulse shown below.

07

Q.4 (b) A 107.6 MHz carrier is frequency modulated by a 7 KHz sine wave. The resultant FM signal has a frequency deviation of 50 KHz. i) Find the carrier swing of the FM signal.

ii) Determine the highest and lowest frequencies attained by the modulated signal.

iii) What is the modulation index of the FM wave?

07

Q.5 (a) Write a short note on self-capacitance of a coil.

07

(b) Two resistors of 20 and 50 kΩ are at room temperature. For a bandwidth of 100 kHz, calculate the thermal noise voltage generated by (a) each resister, (b) the two resistors in series, and (c) the two resisters in parallel.

07

OR Q.5 (a) A series circuit consisting of a coil and a variable capacitance having

reactance Xc. The coil has resistance of 10Ω, inductive reactance of 20Ω. It is observed that at certain value of capacitance current in the circuit is maximum, find (i)the value of capacitance (ii) impedance of the circuit (iii) power factor (iv)current, if applied voltage is 100V,50Hz.

07

(b) Define thermal noise and describe its relationship to temperature and bandwidth.

07

*************




Subject code: 151006 Subject Name: Applied Electronics Date: 21 /12 /2010 Time: 03.00 pm - 05.30 pm

Total Marks: 70

Instructions: 1. Attempt all questions. 2. Make suitable assumptions wherever necessary.


Q.1 (a) What is regulated power supply ? Draw and explain block diagram of SMPS.

Also write advantage of SMPS. 07

(b) Draw and explain the operational amplifier’s closed loop configuration with

necessary equation and compare all. 07

Q.2 (a) Draw and explain block diagram of IC 555. Also explain the Pin connection of

IC 555 07

(b) Design a astable multivibrator using IC 555 and draw its circuit diagram which

generate output signal with frequency of 1kHz and duty cycle of 75%. 07

OR

(b) Design monostable mutivibrator using IC 555 and draw the circuit diagram

which gives output of pulse width of 10 µs. What voltage must be applied to the

CONTROL pin to stretch pulse width from

(i) 10 µs to 20 µs. (ii) 10 µs to 5 µs.

07

Q.3 (a) Give detail classification of the transducer and explain each of them in detail. 07

(b) What is LVDT ? Explain principle and operation of LVDT. Also list the

advantage and application of LVDT. 07

OR

Q.3 (a) What is LCD? List the types of Liquid crystal and explain any two of them. 07

(b) What is SCR? With required figure explain the operation and I-V characteristics

of SCR. 07

Q.4 (a) What is LASCR? Draw and explain construction and characteristics of LASCR

in detail. 07

(b) What is storage oscilloscope? Explain principle and working of storage

oscilloscope. Also write the advantages and disadvantages of storage

oscilloscope compare to CRO.

07

OR

Q.4 (a) What is multimeter ? Draw and explain the block diagram of Digital Multimeter.

Give comparison of analog and digital mutimeter. 07

(b) With necessary figure, Explain block diagram, operation, and future of washing

machine. 07

Q.5 (a) What is universal Gate ? Explain NOR and NAND gate as a universal Gate.

07

(b) Obtain minimal Sum Of Product for the function F(A,B,C,D,E)

=0,2,4,6,9,11,13,15,17,,21,25,27,29,31. 07

OR

Q.5 (a) Draw the block diagram of CD player and explain each blocks in detail. 07

(b) Find out the Boolean expression of the Full Adder sum and carry. Using by same

expression give realization of Full adder circuits. 07

*************

1




Subject Name: Applied Electronics Date:30/06/2011 Time: 10:30 am – 01:00 pm Total Marks: 70




Q.1 (a) Draw the block diagram of a regulated d.c. power supply and explain

briefly the function of each block. 07

(b) Draw the block diagram of an OP-AMP and explain the function of each

block. 07

Q.2 (a) Explain the operation of an astable multivibrator using IC 555. Draw its

circuit diagram and waveforms. 07

(b) Define the following parameters.

1) Common Mode Rejection Ration ( CMRR )

2) Latching current ( IL ) of an SCR.

3) Trace period and retrace period of C.R.T.

07

OR

(b) With the help of the block diagram, explain the operation of a single trace

Cathod Ray Oscilloscope. ( CRO ) 07

Q.3 (a) Derive the expression of OP-AMP for non-inverting closed loop voltage

gain. ( Avf ) 07

(b) Explain the construction and operating principle of a semiconductor strain

gauge. State its advantages and applications. 07

OR

Q.3 (a) Define intrinsic stand off ratio ( η ) of UJT and explain its use as relaxation

oscillator. Draw the relevant waveforms. 07

(b) Explain construction and principle of operation of photoconductive cell. 07

Q.4 (a) Explain in detail the half adder and full adder circuit using logic diagram. 07

(b) Design a monostable 555 timer circuit to produce an output pulse 165 msec

wide. Draw the circuit diagram. Determine the value of external component

RA if C=1 µF

04

(c) Compare RTD and Thermocouple. 03 OR

Q.4 (a) Draw the block diagram of 8051 microcontroller. Explain each block

briefly. 07

(b) Differentiate between microprocessor and microcontroller. 04

(c) Explain Read Only Memory ( ROM ) 03

Q.5 Write a short note. ( ANY TWO ) 14

(a) Linear Variable differential Transformer ( LVDT )

(b) Phase measurement with the help of the Lissajous figures.

(c) Successive Approximation Analog –To- Digital conversion.

(d) 1) I-Pod 2) RFID. **************

1




Subject Name: Applied Electronics

Time: 02.30 pm-05.00 pm Total marks: 70 Instructions:




Q.1 (a) Justify load current variation with change in load for a practical current

source. Classify dependent sources and explain each of them with the help

of figures.

07

(b) Explain any four characteristics of a practical Operational Amplifier.

Design a unity gain circuit of an operational amplifier that has only one

input at the non-inverting terminal.

07

Q.2 (a) Draw the block diagram of an LVDT and plot its characteristics. The

output of an LVDT is connected to a 5V voltmeter through an amplifier

whose amplification factor is 250. An output of 2 mV appears across the

terminals of LVDT when the core moves through a distance of 0.5 mm.

The milli voltmeter scale has 100 divisions. Draw the block diagram of

the whole set up. Calculate the sensitivity of the LVDT and that of the

whole set up. Calculate the resolution of the instrument in mm.

07

(b) Explain the application of astable multivibrator as a square wave

oscillator using a diode.

07

OR

(b) Draw the block diagram of IC 555 and discuss the function of trigger and

control voltage pins.

07

Q.3 (a) Write a short note on strain gauge transducers. 07

(b) How are decimal points indicated in a 7 segment display? Compare

among PN junction diode, LED and LCD.

07

OR

Q.3 (a) Define secondary emission. List comparison among LDR, photodiode and

phototransistor.

07

(b) What is an optocoupler/optoisolator? Explain any one application of the

same.

07

Q.4 (a) Explain alt/chop method. Differentiate among CRO, digital storage

oscilloscope and mesh storage CRT.

07

(b) Chart the VI characteristics of the 4 layer diode. Explain the rate effect for

a p-n-p-n diode.

07

OR

Q.4 (a) Draw the equivalent circuit of UJT and plot its characteristics. 07

(b) Write a short note on bar code scanner and decoder. 07

Q.5 (a) Evaluate [1] (A+ B'+AB)(A+B')(A'B)

Prove De Morgan’s laws.

07

2

(b) Design a combinational logic circuit whose output is high only when

majority of inputs (A,B,C,D) are low. Obtain the expression and

implement it.

07

OR

Q.5 (a) Write a short note on edge triggered toggle flip flop. 07

(b) Compare the microcontroller with a microprocessor. 07

*************

1





Subject Name: Applied Electronics


Instructions:




Q.1 (a) Define following terms:

(i) Ideal Voltage source (ii) Ideal current source (iii) Dependent Voltage source

(iv) Dependent current source (v) Load side regulation (vi) Line side regulation

(vii) Regulated power supply.

07

(b) Discuss any one closed – Loop op-amp configurations in detail. 07

Q.2 (a) How to use 555 as monostable multivibrator? 07

(b) Explain working of Linear variable differential transformer in detail. 07

OR

(b) Explain the working of photoconductive sensors and photovoltaic sensors in detail. 07

Q.3 (a) Discuss following:

(i) Electrical strain gauge (ii) Thermocouple (iii) thermistor

07

(b) For the inverting amplifier with feedback, R1 = 500 Ω and RF = 4.7 KΩ. Assume

that A = 200000, Ri = 2 MΩ, Ro = 75 Ω, fo = 5Hz, Supply voltages = ± 15V,

Output voltage swing = ± 13V. Calculate the values of AF, RiF, RoF , fF, and VooT.

07

OR

Q.3 (a) Explain following operational amplifier parameters.

(i) Input offset voltage (ii) Input offset voltage (iii) Input bias current (iv) Input

capacitance (v) Slew rate (vi) SVRR (vii) CMRR

07

(b) Design a square wave generator at 1KHz using 555 timer IC. 07

Q.4 (a) Explain construction and working of SCR using two transistor model. 07

(b) Write short note on CRO. 07 OR

Q.4 (a) Explain construction and working of UJT. Also explain UJT as relaxation oscillator. 07

(b) Write short note on Digital Multimeter. 07

Q.5 (a) Write short note on Washing Machine. 07

(b) Simplify the following function using karnaugh map method. Also implement it using any

two non-degenerate form.

F(w,x,y,z) = Σ (1,4,6,7,8,9,10,11,15)

07

OR

Q.5 (a) Write short note on Photocopier machine. 07

(b) Explain following Flip-Flop with necessary diagrams.

(i) Clocked R-S flip-flop (ii) JK flip-flop 07

*************

1



Subject code: 151006 Date: 23-01-2013 Subject Name: Applied Electronics Time: 02:30 pm to 05:00 pm Total Marks: 70 Instructions:


Q.1 (a) Draw and explain block diagram of Switched Mode Power Supply

(S.M.P.S.) 07

(b) Draw and Explain block diagram of of IC 555 07

Q.2 (a) Draw and Explain close loop OP-AMP configurations with equations. 07 (b) Explain working of Astable Multivibrator using IC 555 with the help of

neat circuit diagram and waveforms 07

OR (b) Briefly explain (1) Slew Rate (2) Input Offset Voltage

(3) C.M.R.R. (4) Intrinsic Stand off ratio(η) 07

Q.3 (a) Discuss the principal and working of L.V.D.T. with necessary figures.

What are the advantages and disadvantages of L.V.D.T.? 07

(b) Briefly explain Optocoupler with it’s application. Compare Photovoltaic Sensors with Photoconductive sensors.

07

ORQ.3 (a) Explain the principal and working of Thermocouple. Compare it with

RTD. 07

(b) Explain Liquid Crystal Display with necessary figures. 07

Q.4 (a) Draw and explain Characteristic , Construction and working of SCR . 07 (b) Draw and Explain block diagram and working of C.R.O. 07 OR

Q.4 (a) Explain characteristic of UJT . Discuss UJT as a Relaxation Oscillator with circuit and waveforms.

07

Q.4 (b) Write a short note on Digital Multimeter 07

Q.5 (a) Explain architecture of 8051 with block diagram. 07 (b) Write a short note on RFID 07 OR

Q.5 (a) Explain NAND gate as a universal gate. Compare Microprocessor with Microcontroller.

07

(b) Explain R-2R ladder type D/A converter with circuit Diagram and full scale voltage calculation. Why it is better then Binary Weighted Resistor type D/A converter?

07

*************

1/2



Subject Code: 151006 Date: 23-05-2013 Subject Name: Applied Electronics Time: 10:30 pm to 01:00 pm Total Marks: 70 Instructions:


Q.1 (a) What is Ideal Voltage source? Also explain factors affecting the voltage regulation with block diagram of Shunt voltage regulator.

07

(b) What is Switch Mode Power Supply? Also Draw and Explain the working of SMPS with required block diagram circuits and wave forms.

07

Q.2 (a) What is Operational amplifier? Draw and explain the block diagram of an Opamp. Also explain the ideal characteristics of an Opamp.

07

(b) List all types of closed loop connections of an Opamp and explain any two of them in detail.

07

OR (b) What is 555 timer circuits? List all application of 555 timer circuits and explain

any one of them in detail. 07

Q.3 (a) What is transducer? Give characteristics of transducer and explain it. Also List the factors affecting the selection of transducer and explain it.

07

(b) Reduce the following (1) ((A+(BC)’)’(AB’+ABC) (2) AB’C+B+BD’+ABD’+A’C

07

OR Q.3 (a) What is LVDT? Draw and Explain the operations of LVDT? Also state the

advantages and disadvantages of LVDT. 07

(b) Minimize the following output function using K-map (1) f1(A,B,C,D)=∑ m(1,2,3,5,7,8,9)+d(12,14) (2) f2(A,B,C,D)= ∑ m(0,1,2,3,4,6,8,9)+d(10,11)

07

Q.4 (a) What is Liquid Crystal Display? Draw and Explain the functionality of LCD with required figure.

07

(b) What is TRIAC? Draw and explain the construction of of TRIAC? Also explain its operation with required figure.

07

OR Q.4 (a) What is Light Activated SCR? Draw and explain the construction and

characteristics of LASCR in detail. 07

(b) Draw and Explain the block diagram of Cathode Ray Oscilloscope. Also state their advantages.

07

Q.5 (a) What is Digital Multi Meter? Draw and Explain the block diagram of DMM. Also state the advantages of DMM.

07

(b) What is Piezoelectric transducer? Draw and explain the operations of piezoelectric transducer. Also state their advantages, disadvantages and applications of it.

07

OR

Q.5 (a) What is Washing Machine? Properly explain the concept of fuzzy logic used in washing machine.

07

2/2

(b) What is Bar Code Scanner? Draw and explain the operation of Bar Code Scanner with required figure.

07

*************

gujarat technological university · (b) define manpower planning discuss importance and objectives...

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