Staff Selection Commission (SSC) Recruitment 2012
Electrical Engineering
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 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.
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.
Mechanical Engineering
Theory of Machines and Machine Design
Concept of simple machine, Four bar linkage and link motion, Flywheels and fluctuation of
energy, Power transmission by belts – V-belts and Flat belts, Clutches – Plate and Conical
clutch, Gears – Type of gears, gear profile and gear ratio calculation, Governors – Principles
Engineering Mechanics and Strength of Materials
Equilibrium of Forces, Law of motion, Friction, Concepts of stress and strain, Elastic limit and
elastic constants, Bending moments and shear force diagram, Stress in composite bars,
Torsion of circular shafts, Buckling of columns – Euler's and Rankin's theories, Thin walled
pressure vessels
Thermal Engineering
Properties of Pure Substances : p-v & P-T diagrams of pure substance like H2O,
Introduction of steam table with respect to steam generation process; definition of saturation,
wet & superheated status. Definition of dryness fraction of steam, degree of superheat of
steam. h-s chart of steam (Mollier's Chart).
1st Law of Thermodynamics : Definition of stored energy & internal energy, 1st Law of
Thermodynamics for cyclic process, Non Flow Energy Equation, Flow Energy & Definition of
Enthalpy, Conditions for Steady State Steady Flow; Steady State Steady Flow Energy
Equation.
2nd Law of Thermodynamics : Definition of Sink, Source Reservoir of Heat, Heat Engine,
Heat Pump & Refrigerator; Thermal Efficiency of Heat Engines & co-efficient of performance
of Refrigerators, Kelvin – Planck & Clausius Statements of 2nd Law of Thermodynamics,
Absolute or Thermodynamic Scale of temperature, Clausius Integral, Entropy, Entropy
change calculation for ideal gas processes. Carnot Cycle & Carnot Efficiency, PMM-2;
definition & its impossibility.
Air standard Cycles for IC engines : Otto cycle; plot on P-V, T-S Planes; Thermal
Efficiency, Diesel Cycle; Plot on P-V, T-S planes; Thermal efficiency.
IC Engine Performance, IC Engine Combustion, IC Engine Cooling & Lubrication.
Rankine cycle of steam : Simple Rankine cycle plot on P-V, T-S, h-s planes, Rankine cycle
efficiency with & without pump work.
Boilers; Classification; Specification; Fittings & Accessories : Fire Tube & Water Tube
Boilers.
Air Compressors & their cycles; Refrigeration cycles; Principle of a Refrigeration
Plant; Nozzles & Steam Turbines
Fluid Mechanics & Machinery
Properties & Classification of Fluids : ideal & real fluids, Newton's law of viscosity,
Newtonian and Non-Newtonian fluids, compressible and incompressible fluids.
Fluid Statics : Pressure at a point.
Measurement of Fluid Pressure : Manometers, U-tube, Inclined tube.
Fluid Kinematics : Stream line, laminar & turbulent flow, external & internal flow,
continuity equation.
Dynamics of ideal fluids : Bernoulli's equation, Total head; Velocity head; Pressure head;
Application of Bernoulli's equitation.
Measurement of Flow rate Basic Principles : Venturimeter, Pilot tube, Orifice meter.
Hydraulic Turbines: Classifications, Principles.
Centrifugal Pumps : Classifications, Principles, Performance.
Production Engineering
Classification of Steels : mild steal & alloy steel, Heat treatment of steel, Welding – Arc
Welding, Gas Welding, Resistance Welding, Special Welding Techniques i.e. TIG, MIG, etc.
(Brazing & Soldering), Welding Defects & Testing; NDT, Foundry & Casting – methods,
defects, different casting processes, Forging, Extrusion, etc, Metal cutting principles, cutting
tools, Basic Principles of machining with (i) Lathe (ii) Milling (iii) Drilling (iv) Shaping (v)
Grinding, Machines, tools & manufacturing processes.
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