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SCORE CARD TIME MANAGEMENT QUESTIONS REPORT SOLUTION

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DIFFICULTY LEVEL TOPIC REPORTSolution Report For ANALOG ELECTRONICSRepresent whole test solution with correct and incorrect answers.

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Q.No

Question Status

Q.1

Consider the circuit shown below

If the input of the signal is 10 sinω0t then the output of the signal will be

a.

b.

c.

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Not Attempt Correct Ans. b Solution

d.

Q.2

Given a periodic square wave of period T as an input to the circuit shownbelow

Let T >> RC then the output of the above circuit will be

a.

b.

c.



Not Attempt Correct Ans. c Solution

d.

Q.3

In the circuit shown below, the three signals of figure are impressed onthe input terminals

If the diode are ideal then the voltage V0 is

a.

b.




c.

d.

Q.4


The resistivity of uniformly doped n type silicon sample is 0.5 Ωcm. If

the electron mobility (μn) is 1250 cm2/Vsec and the charge of an

electron is 1.6 × 10–19 coulomb, the donor concentration (ND) in the

sample is

a. 2 × 1016 /cm3

b. 1 × 1016 /cm3

c. 2.5 × 1015 /cm3

d. 2 × 1015/cm3

Q.5

Consider the following statements in connection with the CMOS inverterin the figure, where both the MOSFETS are of enhancement type andboth have a threshold voltage of 2 V.Statement 1: T1 conducts when Vi > 2 V

Statement 2: T1 is always in saturation when V0 = 0 V.



Not Attempt Correct Ans. a Solution

Which of the following is correct?

a. Only statement 1 is true

b. Only statement 2 is truec. Both the statements are trued. Both the statements are false

Q.6


Consider the Schmit Trigger circuit shown below,

A triangular wave which goes from –12 V to 12 V is applied to theinverting input of the opamp. Assume that the output of the opampswings from +15 V to –15 V. The voltage at the non inverting inputswitches between.

a. –12 V and +12 Vb. –7.5 V and +7.5 V

c. –5 V and +5 V

d. 0 V and 5 V

Q.7

In a practical RC phase shift oscillator(i) The phase shift provided by the oscillator’s amplifier should be 180°.(ii) The value of R and C in the circuit should be same for all thecapacitors and resistors involved.(iii) The value of gain of the amplifier AV should be equal to inverse of

the modulus of the feedback factor β.Which of the above conditions are necessary for the RC phase shiftoscillator with 3 capacitorfeedback circuits?




a. (i) only

b. (iii) onlyc. (i) and (iii)d. (i), (ii) and (iii)

Q.8


The drain current of a MOSFET in saturation is given by ID = K(VGS – VT)2

where K is a constant. The magnitude of the transconductance gm is

a.

b. 2K(VGS – VT)

c.

d.

Q.9

Not Attempt Correct Ans. d Solution

Consider the following statements S1 and S2.

S1: The β of a bipolar transistor reduces if the base width is increased.

S2: The β of a bipolar transistor increases if the doping concentration in

the base is increased.Which one of the following is correct?

a. S1 is FALSE and S2 is TRUE

b. Both S1 and S2 are TRUE

c. Both S1 and S2 are FALSE

d. S1 is TRUE and S2 is FALSE

Q.10

The i v characteristics of the diode in the circuit given below are




The current in the circuit is

a. 10 mAb. 9.3 mAc. 6.67 mA

d. 6.2 mA

Q.11


A zener diode regulator in the figure is to be designed to meet thespecifications: IL= 10 mA, V0 = 10 V and Vin varies from 30 V to 50 V. The

zener diode has Vz = 10 V and Izk (knee current) = 1 mA. For satisfactory

operation

a. R ≤ 1800 Ω

b. 2000 Ω ≤ R ≤ 2200 Ωc. 3700 Ω ≤ R ≤ 4000 Ωd. R > 4000 Ω

Q.12

The Si transistor shown below is biased for constant base current



Not Attempt Correct Ans. 490.98 (490.50 to 491.50) Solution

If β = 80, VCEQ= 8 V, RC = 3 kΩ and VCC = 15 V then the value of RB is

_________ kΩ.

Q.13

Not Attempt Correct Ans. 3 Solution

In the circuit given below

R1 = R2 = 1 kΩ, RF = R3 = 10 kΩ. If Vx = 2.7 V(P.P.) and Vy = 3 V(P.P.) sine

waves at 100 Hz frequency, the output voltage V0 = ________ V(P.P.)

sine wave.

Q.14

Consider the voltage feedback amplifier




Output voltage V0 is given by ________ V.

Q.15


Given a JFET with VP = 2 V and the maximum drain current IDSS equal

to 5 mA. If we want to operate the JFET at 3 mA then the value oftransconductance will be _____ mA/V.

Q.16


In the circuit shown below, assume β = 125.

The value of IC1= IC2= _____ mA

Q.17

In the figure shown below,

assuming the opamp to be an ideal opamp and Vin = Vm sin(ω0t ) then

the output of the circuit will be




a.

b.

c.

d.

Q.18


The circuit shown below implement a filter between the input current iiand output voltage V0. Assume the opamp is ideal. The filter

implemented is a

a. Low pass filterb. Band pass filterc. Band pass filter

d. High pass filter

Q.19

Consider the circuit shown below,




Assume that transistor to be in saturation region and VBE (sat) = 0.8 V

VCE = 0.2 and β = 100, the current i is

a. –0.3 mA

b. –0.6 mA

c. –0.26 mAd. –0.19 mA

Q.20


In the figure, assume that the forward voltage drops of the PN diode D1and Schotky diode D2 are 0.7 V and 0.3 V, respectively. If ON denotes

conducting state of the diode and OFF denotes non conducting state ofthe diode, then in the circuit.

a. Both D1 and D2 are ON

b. D1 is ON and D2 are OFF

c. Both D1 and D2 are OFF

d. D1 is OFF and D2 are ON

Q.21

In the circuit shown below,




The value of Drain source voltage (VDS) is

a. 4.12 Vb. 5.14 V

c. 4.75 V

d. 5.65 V

Q.22

Consider the opamp circuit shown in the figure,

the transfer function

a.

b.

c.

d.




Q.23


In the transistor amplifier circuit shown in the figure below, the transistorhas the following parameters:βDC = 60, VBE = 0.7 V, hie → ∞, hfe → ∞

the capacitance CC can be assumed to be infinite

Under the DC conditions, the collector to emitter voltage drop is

a. 6 V

b. 7 Vc. 8 Vd. 9 V

Q.24

In the circuit shown below, given rd = 20 kΩ, IDSS = 10 mA and VP = –8

then




the zi and z0 of the circuit are respectively

a. infinity and 2 MΩb. 2 MΩ and 2 kΩ

c. infinity and 20∕11 kΩ

d. 2 MΩ and 20∕11 k Ω

Q.25


In the figure shown

Assume that the transistors are identical and their respectivetransconductance is gm, then the net transconductance will be equal to

a. gm/2

b. 2gmc. (gm)2d. None of the above

Q.26

For the circuit shown in the following figure, transistors M1 and M2 are




identical NMOS transistors. Assume that M2 is in saturation and the

output is unloaded

The current Ix is related to Ibias as

a. Ix = Ibias + Is

b. Ix = Ibiasc. Ix = Ibias – Is

d.

Q.27


In the figure shown below,

If RA = RB then

a. Duty cycle of the output wave is greater than 50%.

b. Duty cycle of the output wave is 50%.c. RA and RB do not influence the duty cycle of the output.

d. Duty cycle is 50% irrespective of RA and RB values.

Q.28




In the basic differential amplifier shown below,

Given: VCC = VEE = 5 V; β0 = 200 and VBE = 0.7 V. For V1 = V2 = 0, the

common mode Rejection Ratio (CMRR) is ______ dB.

Q.29

Not Attempt Correct Ans. 1258 (1250 to 1270) Solution

Consider the common emitter amplifier shown below the following circuitparameters:β = 100, gm = 0.3861 A/V, r0 = ∞, rπ = 259 Ω, RS = 1 kΩ, RB = 93 kΩ, RC =

250 kΩ, RL = 1 kΩ, C1 = ∞ and C2 = 4.7 μF

The resistance seen by the source voltage VS is _______ Ω.



Q.30


In the circuit shown below

+V = 12 V, R2 = 1.5 kΩ, R1 = R3 = 10 kΩ and C1 = 0.001 μF.

The nominal frequency of the output waveform is _________ kHz.

Q.31


A half wave rectifier operates from 50 Hz supply and provides a peakoutput voltage of 60 V across the 600 Ω resistance. The peak to peakripple voltage across load is 15 V. It takes 1 m sec for the capacitor torecharge during each input cycle. The value of capacitance for thecapacitor filter is _______ μF.

Q.32

The current ib through the base of a silicon npn transistor is 1 + 0.1 cos

(10000 πt) mA. AT 300 K, the rπ in the small signal model of the

transistor is _________ Ω.




Q.33


The figure shown below is a Schmit trigger

then the width of the hysteresis loop will be _______ V.

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notattempt correctans

b solutiond

c solutiond

b solutionc

value of r

donor concentration

triangular wave

charge of anelectron