Exam Pattern
Total Questions-200
Part-I consists of 140 MCQ of the discipline.
Part-II consists of 30 MCQ on GK+C.A
Part-III of 30 MCQ Reasoning
Total Time-3 Hours
Negative Marking-0.25
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Basic concepts: Concepts of resistance, inductance, capacitance, and various factors affecting
them. Concepts of current, voltage, power, energy and their units.
Circuit law: Kirchhoff’s law, Simple Circuit solution using network theorems.
Magnetic Circuit: Concepts of flux, mmf, reluctance, Different kinds of magnetic materials,
Magnetic calculations for conductors of different configuration e.g. straight, circular,
solenoidal, etc. Electromagnetic induction, self and mutual induction.
AC Fundamentals: Instantaneous, peak, R.M.S. and average values of alternating waves,
Representation of sinusoidal wave form, simple series and parallel AC Circuits consisting of
R.L. and C, Resonance, Tank Circuit. Poly Phase system – star and delta connection, 3 phase
power, DC and sinusoidal response of R-Land R-C circuit.
Measurement and measuring instruments: Measurement of power (1 phase and 3 phase,
both active and re-active) and energy, 2 wattmeter method of 3 phase power measurement.
Measurement of frequency and phase angle. Ammeter and voltmeter (both moving oil and
moving iron type), extension of range wattmeter, Multimeters, Megger, Energy meter AC
Bridges. Use of CRO, Signal Generator, CT, PT and their uses. Earth Fault detection.
Electrical Machines: (a) D.C. Machine – Construction, Basic Principles of D.C. motors and
generators, their characteristics, speed control and starting of D.C. Motors. Method of braking
motor, Losses and efficiency of D.C. Machines. (b) 1 phase and 3 phase transformers –
Construction, Principles of operation, equivalent circuit, voltage regulation, O.C. and S.C.
Tests, Losses and efficiency. Effect of voltage, frequency and wave form on losses. Parallel
operation of 1 phase /3 phase transformers. Auto transformers. (c) 3 phase induction motors,
rotating magnetic field, principle of operation, equivalent circuit, torque-speed
characteristics, starting and speed control of 3 phase induction motors. Methods of braking,
effect of voltage and frequency variation on torque speed characteristics.
Fractional Kilowatt Motors and Single Phase Induction Motors: Characteristics and
applications.
Synchronous Machines – Generation of 3-phase e.m.f. armature reaction, voltage regulation,
parallel operation of two alternators, synchronizing, control of active and reactive power.
Starting and applications of synchronous motors.
Generation, Transmission and Distribution – Different types of power stations, Load factor,
diversity factor, demand factor, cost of generation, inter-connection of power stations. Power
factor improvement, various types of tariffs, types of faults, short circuit current for
symmetrical faults. Switchgears – rating of circuit breakers, Principles of arc extinction by oil
and air, H.R.C. Fuses, Protection against earth leakage / over current, etc. Buchholtz relay,
Merz-Price system of protection of generators & transformers, protection of feeders and bus
bars. Lightning arresters, various transmission and distribution system, comparison of
conductor materials, efficiency of different system. Cable – Different type of cables, cable
rating and derating factor.
Estimation and costing: Estimation of lighting scheme, electric installation of machines and
relevant IE rules. Earthing practices and IE Rules.
Utilization of Electrical Energy: Illumination, Electric heating, Electric welding, Electroplating,
Electric drives and motors.
Basic Electronics : Working of various electronic devices e.g. P N Junction diodes, Transistors
(NPN and PNP type), BJT and JFET. Simple circuits using these devices
