[ITI] Electrician Theory I, II Year 2021 Edition (English)

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Basics of the Trades;

Industrial Training Institutes (ITI)

The Electrician Trade

International System (SI) of Units

Electrical Symbols According to BIS

Occupational Safety and Health

Occupational Safety and Health Act (OSHA)

Importance of Occupational Safety and Health


Personal Protection

Various Safety Measures Used in the Industry

Safety Signs

Electrical Injuries

Basic First Aid

Elementary First Aid

Hazard Identification

Hazard Avoidance

Fire Extinguisher

Types of Fire Extinguishers

Using Fire Extinguishers

Soft Skills

5S Concept

Concept of Standard

Visit and Observation of Sections

Workshop Tools

Electrician Tools

Fitting Tools

Safety Precautions used in Fitting Trade

Carpentry Tools

Drilling Tools

Taps and Dies


Thread Gauge

Sheet Metal Work

Sheet Metal Tools


Fundamentals of Electricity

The Electron Theory

Nature of Electricity

Unit of Charge

The Electron

Energy of an Electron

Free Electrons

Fundamental Terms and Definitions

Fundamental Quantities and SI Units

Effects of Electric Current

Conductors, Semiconductors and Insulators

Passive Devices


Properties of Resistors


Ohm’s Law

Resistors in Combination

Kirchhoff’s Law

Temperature Coefficient of Resistance

Measurement of Resistance



Soldering and Soldering Flux

Soldering Techniques


Wires and Cables

National Electrical Code (NEC)


Permissible Temperature Rise


Types of Wires

Specifications of Wires


Current Rating and Fusing Current of Cable

Electrical Wiring Cable

Power Cables

Selection of Cables

Cable Insulation

Voltage Grade of Cable

Standard Wire Gauge

Cable Jointing (Splicing)

Precautions used in Various Types of Cables

Common Electrical Wiring Accessories

Electrical Accessories

Domestic Electrical Circuit

Simple Alarm Circuit

Fire Alarm

Miniature Circuit Breaker (MCB)

Earth Leakage Circuit Breaker (ELCB)

Molded Case Circuit Breaker (MCCB)

Specifications of Common Electrical Accessories with NEC 2011

Chemical Effect of Current


Principle of Electrolysis

Terms Associated with Electrolysis

Faraday’s Law of Electrolysis

Applications of Elecrolysis



Cathodic Protection

Grouping of Cells

Power and Capacity of Cell

Efficiency of Cell/Batteries

Care and Maintenance of Cells



UPS : Uninterruptible Power Supply

Solar Battery



Comparison between Permanent Magnet and Electromagnet

Methods of Magnetization

Magnetic Substances

Magnetic Field

Important Definitions Related to Magnetism


Determination of the Force in Current Carrying Conductor

Faraday’s Law of Electro Magnetic Induction


Eddy Current

Alternating Current

Direct Current (DC)

Alternating Current (AC)

Comparison between DC and AC


Generation of Sine Wave

Inductive Reactance

Capacitive Reactance

Active and Reactive Power

Power Factor

Power Consumption in Series Circuit

Power Consumption in Parallel Circuit

Single Phase System

Three Phase System

Three Phase Star Connection

Three Phase Delta Connection

Unbalanced Load Circuits



Earth Leakage Circuit Breaker (ELCB)

Importance of Earthing

Improving Earth Resistance

Specifications Required for Earthing as per ISI

BIS Provision for Earthing (It is Recommended to Follow IPC 60364 Guidelines)

Basic Electronics

Semiconductor Materials

Energy Bands and Levels

Atomic Structure

P-N Junction

Working of Junction Diode

Classification of Diodes

Specifications of Diodes

Heat Sink

Peak Inverse Voltage


Filter Circuits

Oscilloscopes, Transistors and Power Amplifiers

Cathode Ray Oscilloscope

Working Principle of CRO

Uses of CRO


Working of a Transistor

Transistor Configurations

Relationship between a, b and g

Specification and Rating of Transistors

Transistor as an Amplifier

Comparison between CB, CE and CC Configuration

Classification of Amplifiers

Power Amplifier

Classification of Power Amplifier

Oscillators and Multivibrators


Barkhausen Criterion for Oscillation

Tank Circuit

Types of Oscillators


Power Electronics Devices

Integrated Circuits

Classification of ICs

Advantages of Integrated Circuits

Disadvantages of Integrated Circuits

Field Effect Transistors

Silicon Controlled Rectifier (SCR)



Unijunction Transistor (UJT)

Gate Turn-Off (GTO) Thyristors

Insulated Gate Bipolar Transistor (IGBTs)

Digital Electronics

Binary Number System

Octal Number System

Hexadecimal Number System

Arithmetic Operations

Logic Gates

Basic Logic Gates

Combination of Basic Logic Gates

Tabular Summary

Combinational Circuit

Classification of Combinational Circuits

Electrical Wiring

Electrical Wiring System

Domestic Wiring

Industrial Wiring

Wiring of Entertainment Systems

Control Wiring

Information Communication Wiring

Domestic Wiring Layout

Types of Domestic and Industrial Wiring

The Conduit Accessories

Grading of Cables

Current Rating and Fusing Current of Cable

Voltage Drop Concept

Testing Wiring Installation using a Megger

Specification for Wiring

Data Sheet Preparation

I.E. Rules :- Please Refer to the Appendix

Fuses, Relays and Circuit Breakers



Electromagnetic Relay

Thermal Relay

Miniature Circuit Breaker (MCB)

Earth Leakage Circuit Breaker (ELCB)

DC Machines

Direct Current (DC) Generators

Types of DC Generators

E.M.F. Equation of DC Generator

Armature Reaction

Losses in DC Generator

Efficiency of DC Generator



Applications of DC Generators

Characteristics of DC Generator

Parallel Operation of DC Generator

Care and Maintenance of a DC Generator

DC Motor

Back E.M.F. in DC Motor

Torque in DC Motor

Speed of a DC Motor

Types of DC Motor

Starters Used in DC Motors

Characteristics of a DC Motor

Applications of DC Motor

Losses and Efficiency

Speed Control of DC Motors

AC-DC, DC-DC Control

Care and Maintenance of a DC Motor


Working Principle of Transformer

Construction of a Transformer

Classification of Transformers

Core-Type Transformer

Shell-Type Transformer

Instrument Transformer


Dry Type Transformer

Power Transformer

Isolation Transformer

Single Phase Transformers

Three Phase Transformers

EMF Equation of a Transformer

Parallel Operation of Transformers

Connections of 3-phase Transformers

Voltage Regulation of Transformer

Losses in a Transformer


Transformer Oil

Cooling Methods of Transformer

Tap Changing Transformer

Specifications of a Transformer

Electrical Measuring Instruments

Types of Electrical Measuring Instruments

Torques of an Indicating Instruments

Permanent Magnet Moving Coil Instrument (PMMC)

Moving Iron Instruments (MI Instruments)



Extension of Ammeter Range

Extension of Voltmeter Range



Energy Meter


Frequency Meter

Phase Sequence Indicators

Power Factor Meter

Tong Tester

Earth Tester


Three-Phase Induction Motors

Production of Rotating Magnetic Field

Principle of Operation of a Three-Phase Induction Motor

Construction of Induction Motor

Symbolic Representation

Types of Induction Motor

Comparison Between Squirrel-Cage and Slip-Ring Induction Motor

Slip and Rotor Speed

Torque Production

Torque-slip Characteristic

Advantages and Disadvantages of Three-Phase Induction Motor

Necessity of Starter

Control and Power Circuit for Three-Phase Induction Motor

Speed Control of Induction Motor

Single Phasing Preventer

Losses in Induction Motors

Power Flow Diagram and Efficiency

Applications of Three-Phase Induction Motor

Maintenance of Induction Motor

Single-Phase Motors

Single-Phase Induction Motor

Double Revolving Field Theory

Starting Methods of Single-Phase Induction Motor

Universal Motor (Single-Phase Series Motors)

Fractional Horse Power (FHP) Motors

Single-Phase Synchronous Motors

Stepper Motors

Repulsion Motor

Applications of Various Types of Single-Phase Motors

Braking of Single-Phase Motors


Principle of Operation

Prime-movers for Synchronous Generators

Construction of an Alternator

E.M.F. Equation of an Alternator

Speed and Frequency

Synchronous Speed

Alternator Efficiency

Voltage Regulation

Phase Sequence

Parallel Operation of Alternators

Synchronizing Procedure

Alternator Specifications

Brushless Alternators

Effect of Change of Excitation and Mechanical Input

Power Factor Corrections

Synchronous Motor

Construction of a Synchronous Motor

Operating Principle

Making the Synchronous Motor Self-starting

Operation of Synchronous Motor on Variable Load

Operation of Synchronous Motor at Constant Load Variable Excitation

V-Curve and Inverted V-Curve

Causes of Low Power Factor

Power Factor Improvement

Power Factor Improvement Equipment

Applications of Synchronous Motor

Comparison of Synchronous Motor and Induction Motor


Types of Converter on the Basis of Input and Output Power

Rotary Converter


Motor-generator Set

Solid State Controllers

Solid State Inverter

Transformer Winding

Position of Winding

Design of Transformer Winding

Different Winding Techniques

Range of Different Types of Windings

DC and AC Machine Winding

DC Machine Winding

Terms Used in DC Armature Winding

Types of DC Armature Winding

Coil Connection

Connected Armature Winding

Developed Winding Diagram


Electrical Conducting Materials and Their Characteristics

Insulating Materials

Major Insulation Materials and their use in Electrical Machines

Definition Related to AC Armature/Stator Winding

Connected Armature Winding

Different Types of AC Windings

Drawing Winding Diagram for Single Phase and Three Phase Induction Motor


Nature of the Light

Terms Used in Illumination

Laws of Illumination

Types of Illumination

Types of Lamps

Photoelectric Cells

Solar Lamps

Decorative Lamp Circuits with Drum Switches

Important Points to be Considered in the Designing of a Lighting Scheme

Method of Lighting Calculations

Calculation of Illumination

Estimating Light and Fan Circuit

Wiring Installation and Circuit Breakers

Industrial Wiring

Industrial Code and Relevant Span

Domestic Wiring

Domestic Wiring Layout

Wiring of a Building

Simple Circuits

Wiring of Electric Motor

Wiring of Control Panel

Splitting Outlets

Fault Finding and Troubleshooting

Circuit Breaker

Agricultural Appliances

Controlling Devices

Operational Instructions

Troubleshooting in Pumps

Domestic Appliances

Machine Control Panel

Machine Control Panel

Construction of Control Panel

Machine Control Panel Layout

Machine Control Panel Wiring

Control and Power Circuit of Machine

Control Elements

Wiring Accessories

Raceways/Cable Channel

DIN Rail

Terminal Connectors

Thimbles or Lugs


Cable Tie or Cable Binding Strap



Cable Clips


Domestic Electric Appliances

Electric Iron

Electric Heater

Hot Plate

Electric Oven

Electric Kettle

Electric Bell


Fire Alarm

Burglar Alarm

Electric Geyser

Cooking Range

Mixer Grinder

Washing Machine

Concept of Neutral and Earth

Motor Pump

Emergency Light

Jet Pump

Submersible Pump

Energy Resources for Power Generation

Energy Sources

Classification of Energy Resources

Comparison of Energy Sources


Advantages of Liquid Fuels over Solid Fuels

Advantages of Solid Fuels over Liquid Fuels

Comparison of Solid, Liquid and Gaseous Fuels

Thermal Power Plant and Turbines

Constituents of Thermal Power Plant

Coal and Steam Turbines

Hydraulic Turbine

Gas Turbine

Diesel Turbine

Hydroelectric Power Plant

Site Selection for Hydroelectric Power Plants

Schematic Arrangement of a Hydroelectric Power Plants

Constituents of Hydroelectric Plant

Types of Hydroelectric Power Stations

Advantages and Disadvantages of Hydroelectric Power Plant

Applications of Hydroelectric Power Plants

Nuclear Power Plant

Schematic Arrangement of Nuclear Power Station

Composition of an Atomic Nucleus

Advantages of Nuclear Power Plant

Disadvantages of Nuclear Power Plant

Comparison between Hydroelectric Power Plant, Nuclear Power Plant and Thermal Power Plant

Non-Conventional Energy Sources

Solar Energy

Biogas Energy

Wind Energy

Ocean Energy

Micro-hydel Power

Transmission of Electrical Power and Underground Cables

Electric Supply System

Flow of Power System

Transmission System

AC and DC Transmission System

Advantages of High Voltage Transmission

Various Systems of Power Transmission

Overhead Lines

Types of Power Lines

Underground Cables

Cable Faults and Their Location

Distribution of Power

Distribution System

Classification of Distribution System



Bus-Bar Arrangement

Short Circuit

Faults in a Power System

Lightning Arresters

Circuit Breaker

Electrical Drives

Electrical Drives

AC Drives

DC Drives

Speed Control of a 3-phase Induction Motor using Variable Voltage Variable Frequency Control System

or AC Drives

Speed Control of a DC Motor Using DC Drives

Comparison between DC Drives and AC Drives

Power Electronic Devices and Maintenance of Electric Machines

Power Thyristor

Power Transistor

Maintenance of Electrical Machines

UPS (Uninterruptible Power Supply)

Voltage Stabilizer

Bipolar Junction Transistor (BJT)/Transistor



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