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# Electrical Engineering

BI 1478

New

According to New Revised 'G' Scheme

# Electrical Engineering

Author: Mangesh Gokhale, Animesh Prabhugaonkar

Book Id: 1478

ISBN No: 9789350161791

Second Year Diploma, Sem III

Electronics Group

Solved Questions Papers upto Winter 2015

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Contents

1. AC Fundamentals

1. Introduction

2. Difference between AC and DC quantity

2.1 Alternating Current

2.2 Direct Current

3. Advantages of AC Supply over DC

4.  Waveform of Sinusoidal AC Cycle

5. Generation of Single Phase AC by Elementary Alternator

5.1 Construction

5.2 Working Principle

6. Definitions related to Alternating current

6.1 Peak Factor (Crest Factor)

6.2 Form Factor

6.3 Equation of a Sinusoidal Waveform

Solved Examples

7. Vector Representation of Sinusoidal AC Quantity

7.1 Phasor Algebra

7.2 Conversion from Add to Polar and vice versa

Solved Examples

8. Concept of Phase

8.1 Concept of Lagging and Leading

8.2 Mathematical Equations of Phasors

Solved Examples

8.3 Single Phase AC circuit

9. Purely Resistive AC Circuit

Solved Example

10. Purely Inductive AC Circuit

10.1 Inductive Reactance (XL)

10.2 Power in Purely Inductive Circuit

Solved Example

11. Purely Capacitive AC circuit

11.1 Capacitive Reactance (XC)

11.2 Power in Purely Capacitive Circuit

Solved Example

11.3 Comparison between Pure R, Pure L and Pure C, AC Circuit

12. Concept of Impedance and Impedance Triangle

13. Power in AC Series Circuits

14. Power Factor

15. R-L Series Circuit

16. R-C Series Circuit

17. R-L-C Series Circuit

17.1 Resonance in R-L-C Series Circuit

17.2 Resonance in Parallel Circuits

17.3 Comparison between Series and Parallel Resonance Circuit

Solved Example

2. Polyphase Circuits

1. Introduction

2. Advantages of 3-Phase System over Single Phase System

3. Principle of 3-Phase EMF Generation and its Waveform

4. Concept of Phase Sequence

6. Relations between Phase and Line Values

6.1 Relationships between Line and Phase Values in STAR Connection

6.2 Relationship between Line and Phase Values in DELTA Connection (D)

Solved Example

3. Electromagnetic Induction

1. Introduction

2. Relation between Magnetism and Electricity

3. Production of Induced EMF and Current

4. Faradays Law of Electromagnetic Induction

5. Fleming's Right Hand Rule

6. Lenz Law

7. Induced EMF

8. Energy stored in Magnetic Field

4. Single Phase Transformer

1. Introduction

1.1 Principle of Working

1.2 Construction of Transformer3

1.3 Classification of Transformer

1.4 Brief Description of Types of Transformers

2. EMF Equation of a Transformer

3. Voltage Ratio, Current Ratio and Transformation Ratio

4. kVA Rating of a Transformer

5. Losses in a Transformer

6. Efficiency of a Transformer

7. Auto Transformer

8. Applications of Transformer

Solved Example

5. Three Phase Induction Motor

1. Introduction

2. Classification of Motors

3. Three Phase Induction Motor

3.1 Principle of Working

3.2 Construction of 3-Phase Induction Motor

4. Types of Induction Motor

4.1 Squirrel Cage Induction Motor

4.2 Slip Ring or Wound Induction Motor

5. Synchronous Speed and Slip

5.1 Synchronous Speed

5.2 Slip

5.3 Rotor Frequency

6. Torque - Speed Characteristics

7. Necessity of starter

8. Speed Control Methods

8.1 Frequency Control Method

8.2 Pole Control Method

8.3 Slip, i.e., Voltage Control Methods

8.4 Speed Control of 3-Phase Induction Motor by using Silicon Controlled Rectifire / (V/f Control)/ Thyristor Control

9. Reversal of Rotation

10. Applications of Induction Motor

Solved Example

6. Fractional Horse Power Motors

1. Introduction

2. Classification of Motors

3. Single Phase Induction Motors

3.1 Schematic Representation of Single Phase Induction Motors

3.2 Principle of Operation of Single Phase Induction Motor

3.3 Types of Single Phase Induction Motors

3.4 Application of Single Phase Induction Motors

4. Universal Motor

4.1 Construction of Universal Motor

4.2 Types of Universal Motor

4.3 Principle of Operation

4.4 Speed - Torque Characteristics

4.5 Reversal of Direction of Rotation

4.7 Applications of Universal Motor

5. Stepper Motor

5.1 Types of Stepper Motor

5.2 Characteristics of Stepper Motor

5.3 Applications of Stepper Motor

6. Servo Motor

6.1 Characteristics of Servo Motor

6.2 Types of Servo Motors

6.3 Applications of Servo Motors

7. Electrical Safety

1. Importance of Safety Devices

2. Types of Safety Devices

2.1 Fuses

2.2 MCCB - Moulded Case Circuit Breaker

2.3 Earth Leakage Circuit Breaker

2.4 Cables

3. Megger

3.1 Constructional Parts

3.2 Working

3.3 Use of Megger as an Earth Tester

4. Necessity of Earthing and its Types

4.1 Importance of Earthing

4.2 Classification of Earthing

4.3 Factors affecting the Value of Earth Resistance

4.4 Types of Earthing

5. Electrical Safety

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