bee cse course file

Basic Electrical and Electronics Engineering

BASIC ELECTRICAL AND ELECTRONICS ENGINEERING

(CSE)

Objective:

The overall objective of teaching this one year course on Basic Electrical Engineering is

to give the Under Graduate Engineer a through grounding of the fundamentals of

electrical engineering irrespective of the stream he/she belongs to.

This subject basically comprises of five units.

Unit-I deals with basics of electricity, electrical quantities and elements & deals

with basics of network theory, type of sources, network conversions, network

theorems.

Unit-II deals with theory of magnetic circuits, magnetic quantities, and analogy

between electrical and magnetic circuits. Transformers & tests on it.

Unit-III deals with DC machines, torque production, emf equation, its operation

as motor and generator. AC machines: Principle of operation ,slip & torque

equations.

Unit-IV deals with P-N Junction Diode Characteristics, Volt-ampere characteristics , Zener diode characteristics, Rectifiers : Half ,Full wave & bridge rectifiers with & without filters. Transistor : PNP & NPN junction transistor , SCR characteristics

Unit-V deals with Principles & applications of CRT , Oscillators: Condition for oscillations, RC-phase shift oscillators with transistor, Colpitts, Hartley oscillators, wein bridge oscillators.

Before commencement of the subject the student should have knowledge of:

Vector calculus

Complex arithmetic

Various functions like trigonometric and exponential etc.

Knowledge about solution of Differential equations in time domain

Differentiation and Integration of different functions.

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Course outcome:

At the end of the second year first semester the student would develop an in depth

knowledge of Basic circuit elements and their functioning when networked .Equipped

with this knowledge the student would be able to analyze many engineering problems by

tracing the various elements in the set processes in terms of the electrical equivalents and

they will get knowledge on semiconductor devices and measuring instruments.

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UNIT -I

Objective:

The objective of this unit is to make the students familiar with the basic fundamentals of

electrical circuits and introduce him/her in the following topics:

Electric field, intensity, potential, potential difference emf etc.,

Different circuit elements and their characteristics

Electromagnetism related laws

Kirchhoff’s laws applied to electrical circuit

Types of sources

Basic circuit elements

Network simplification techniques

Network theorems

Outcome: After Completion of this unit the students will get a knowledge on basic

circit elements and the laws used to solve the different electrical circuits. Students can

understand the basic fundamentals & the students will understand the fundamentals of

sources and types of elements which are used to solve the network problems. They will

have a good knowledge on network theorems and their use.

Subjective Questions:

1. State and explain Kirchhoff’s laws.

2. Explain Faraday’s Laws of electromagnetic induction.

3. What are electromagnetisms related laws?

4. State and explain different types of induced emf’s.

5. State and explain Ohm’s law.

6. Explain about different Active and Passive elements with their voltage current

relationships.

7. State and explain Thevenin’s Theorem.

8. State and explain Maximum Power Transfer theorem.

9. State and explain Superposition theorem.

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Objective type questions:

1.Whenever the magnetic flux changes w.r.t an electrical conductor/coil an EMF is

induced in the conductor is Faraday’s_______law.

2. A capacitor is a device that can store energy in the form of _______________3.The work done per unit charge is known as _____________ 4. The magnitude of force is given by ______________5. Charge is measured in _____________6. If n equal resistors are connected in series then equivalent resistance is _____________

7. If n equal resistors are connected in parallel then equivalent resistance is

_____________

8. If n equal capacitors are connected in series then equivalent capacitance is

_____________

9. If n equal capacitors are connected in parallel then equivalent capacitance is

_____________

10. If n equal inductors are connected in series then equivalent inductance is

_____________

11. If n equal inductors are connected in parallel then equivalent inductance is

_____________

12. Any closed path formed by the branches in a network is called a ________

Multiple Choice Questions

1. Resistance is always measured in ( ) (a)ohms (b)coulombs (c)amperes (d)henrys

2. The force acting between two oppositely charged bodies is ( ) (a)chemical force (b)magnetic force (c)electrostatic force (d)none of the above

Problems :

1.Find the equivalent resistance between the terminals A & B in the following network.

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R11k R11k

R11k

R11k

R11k5

R11k

R11k R11k

3

3 3

3

1

1

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2. Determine the current I in the network by using Thevenin’s theorem. as shown in fig

UNIT-II

Objective:

The main objective of this unit is to give the student a brief knowledge of magnetic

circuits, and various quantities associated with it and the concept of electromagnetism

and to impart knowledge on Transformers.

Outcome:

At the end of this unit the students will get a good knowledge on magnetic circuits and

the concept of Electromagnetism. They will get a good knowledge on transformers and

there constructional details and the best use of transformers in the industry.

Subjective Questions:

1. A 200Kva, 2000/440V,50Hz single phase transformer gave the following test results:

O. C Test: 2kv,1.75 kw,1.8 A S C Test: 13V, 1kw, 300A

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Find (a) parameters of equivalent circuit as referred to H V side.(b) regulation and

efficiency at full load, 0.8 pf lag

2. Give the relationship between MMF, Flux and Reluctance.

3. Give the constructional details of a transformer.

4. Define a magnetic circuit.

5. Compare the electric & magnetic circuits.

Objective Type Questions:

1. The core in a large power transformer is built ofA) cast iron B) mild steel C) Ferrite D) Silicon steel

2. A transformer transformsA) frequency B) voltage C) current D) voltage & current

3. The main purpose of using core in a transformer is toA) decrease iron losses B)prevent eddy current lossesC) eliminate magnetic hysterisesD) decrease the reluctance of the common magnetic circuit.

4. A step up transformer increasesA) voltage B) current C) power D) frequency

5. The primary and secondary windings of an ordinary 2 winding transformer always haveA) different number of turns B) separate magnetic circuits C) a common magnetic circuit D) same size of copper wire

Objective type Questions

1. Unit of magnetic field intensity is ________

2. Unit of flux is ________

3. Unit of magnetic field intensity is ________

4. Unit of flux is ________

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5. Magnetic circuits obey _____________ laws.

UNIT - III

OBJECTIVE:

The aim of this unit is to become familiar with the D.C. generator. To define a D.C. Generator. To study the construction of a D.C. generator. To study the armature winding of a D.C. generator. To derive the generator e.m.f equation. To derive the torque equation in D.C. motor. To understand the concept of slip & torque characteristics of A.C.machines

OUTCOME:

The students will have good concept of DC machines both as a generator and Motor and their application .They will have a good knowledge on their construction details ,EMF production, Torque production and the types of both AC & DC machines. At the end of this unit they will get awareness on both AC & DC machines.

SUBJECTIVE QUESTIONS:

1. Explain constructional features and working principles of DC generator. 2. Derive the expression of induced emf of dc generator.3. Explain the torque equation in a AC machine

OBJECTIVE QUESTIONS: (1) Rotating part in D.C. generator known as

A. Pole B. Stator C. Armature D. Brush

(2) Why is the air gap between the yoke and armature of a machine kept smaller A. To achieve stranger B. To avoid over heating of machine

C. To make station easier D. None

(3) The function of commutation is A. To change A.C to D.C. B. To speed controlC. To improve commutation D. None

(4) The function of carbon brushes A. Stable operation B. Provide a path for flow of current C. Prevent overheating D. None

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(5) The induced e.m.f depends on A. Commutation B. Speed C. Frequency D. None

(6) In any D.C. generator the e.m.f generated in the armature is maximum when A. Rate of change of flux linkage is minimum B. Rate of change of flux linkage is maximum C. Flux is maximum D. Flux is minimum

FILL IN THE BLANKS:

1 Inter poles are used in __________________________ wound machines.

2 For providing proper commutation it is advisable to use ______________ commutation.

3 In D.C. generator, e.m.f commutation can be achieved by __________________.

4 A D.C. generator has 6 poles. A shift of 6 degrees of mechanical degrees means a brush shift of _______________________ electrical degrees.

5 Equation for induced e.m.f (Eq) _____________________

6 Relation between electrical, mechanical degrees and no. of poles is _______________

UNIT-IV

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Objective

The main objective of this unit to give a knowledge on semiconductor devices and to give understaning on PN junction diode and the current flow through the PN junction.Application of PN junction Diode as a Rectifier. Characteristics of PN junction Diode and to impart knowledge on different types of semiconductor devices like Zener Diode. Transistors and transistors as an amplifier,SCR characteristics

OutcomeAt the end of this unit the students will have a good knowledge on Semiconductor devices and how a semiconductor is used as an PN Junction Diode , characteristics of PN Junction Diode and there energy band Diagrams. They will get a good knowledge on Zener-Diode,Transistors and transistors as an amplifier,SCR characteristics & will gain the knowledge in application point of view.

Subjective Questions

1. Explain the operation of the PN junction diode and V-I characteristics.2. Explain the Characteristics of Zener diode3. Explain the working of a half-wave rectifier4. Explain the working of a bridge-wave rectifier with & without filters5. Explain operation of NPN and PNP Transistors?6. Explain the characteristics of SCR?

MULTIPLE CHOICES1. Pentavalent impurities are _________ ( )

A) Germanium B) Antimony C)SiliconD) All of the above

2. Acceptor impurities are of ( )A) N-type materialB) P-type material C) Both D) None

3. The peak inverse voltage (PIV) across a non-conducting diode in a bridge rectifier is equal to ( )

A) Half the peak secondary voltage B) twice the peak secondary voltage C) the peak secondary voltage D) four time peak secondary voltage

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4. The Efficiency of a Half Wave Rectifier is ………. ( ) A) 40.6 B) 55 C)65 D)81.2

Fill in the Blanks

1. Zener diode is designed to be operated in the ______________________

condition

2. Diode is in Forward biased when the depletion layer voltage is……………..then

the applied voltage.

3. The advantage of Bridge Rectifier …………………

4. The Ripple Factor of Full Wave Rectifier is…………

UNIT-V

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Objective:

The main objective of this unit is to give a knowledge on Cathode ray oscilloscope, electrostatic & magnetic deflection, oscillators : RC phase shift oscillators with transistor to have a good knowledge of RC, Colpitts ,Hartley Oscillators & wein-bridge oscillators.

Outcome:At the end of this unit students will get knowledge on oscillators with Transistors .They will have good understanding on Hartley and Colpitts oscillators ,Weinbridge Oscillators, RC –phase shift oscillators.

Subjective Questions :

1. Describe the construction of RC-Phase shift oscillator and explain its working?

2. Draw the circuit diagram of Wien-bridge oscillator and explain its operation?

3. Draw the circuit diagram of hartely oscillators?

4. Draw the circuit diagram of colpitts oscillators?

5. Explain the condition for oscillators?

6. Draw the construction of the RC Feedback amplifier ?

MULTIPLE CHOICES

1. An oscillator converts….

( )A) AC power to DC power B) DC power to AC powerC) Mechanical power to AC power D)None

2. An Oscillator produces……….Oscillations

( )A) Damped B)Un damped C) Modulated D)None

3. Hartley Oscillator is commonly used in ………..

( )

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A) Radio receivers B) Radio transmitters C) TV receivers D) None4. In a phase shift Oscillator, we use……….RC sections

( )A) Two B) Three C) Four D) None

5. A Wien bridge Oscillator uses ……..

( )A) Only +ve B) Only –ve C) Both +ve and –ve D) None

Fill in the Blanks

1. One condition for Oscillations………………………2. The operating frequency of a Wien bridge Oscillator is given by……………….3. ………………….is a fixed frequency oscillator4. An Oscillator differs from an amplifier because it……………….

5. The signal generator generally used in the laboratories is ……………Oscillator

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