RRB JE ELECTRICAL & ALLIED ENGINEERING PREVIOUS YEAR QUESTIONS

Syllabus for Electrical & Allied Engineering Exam Group-JE
SI. No. Subject
1. Basic concepts: Concepts of resistance, inductance, capacitance, and various factors affecting them.
Concepts of current, voltage, power, energy and their units.
2. Circuit law: Kirchhoff’s law, Simple circuit solution using network theorems.
3. 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.
4. 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-L and R-C circuit.
5. 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 coil 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.
6. 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 of 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.
7. 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.
8. 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 and Protection: Rating of circuit breakers, Principles of arc extinction by oil and air,
H.R.C. Fuses, Protection against earth leakage/over current, etc Buchholz 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.
9. Estimation and costing: Estimation of lighting scheme, electric installation of machines and relevant IE
rules. Earthing practices and IE Rules.
10 Utilization of Electrical Energy: Illumination, Electric heating, Electric welding, Electroplating,
Electric drives and motors.
11. 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.