Sources of energy, Power generation: steam, hydel, gas, wind & nuclear; Power generation in Indian context.

General structure of electrical power system; power transmission & voltage levels; power distribution through overhead lines & underground cables.

D.C Networks:

Basic concepts; concepts of linear, nonlinear, active, passive, unilateral and bilateral elements; ideal and practical voltage & current sources – conversion from one from the other.

Kirchoff’s laws – statements & explanation with example. Mesh current method – definition of mesh & loop, advantage; illustrative example.

Node voltage method – Definition of a node, formation of equations, advantage & illustrative example. Delta-Star & Star-Delta conversion; necessity, equivalence & relations; illustration with example.

Superposition principle – statement, limitations; explanation & illustration with examples; practical verification. Thevenin’s theorem – statement, advantages in case of complex networks; explanation & illustration with examples.

Nonlinear circuits – d.c circuits with one nonlinear element; its solution with example.

D.C. Transients: R-L & R-C transients – solution for current , voltage or charge as a function of time; time constants; R-L-C transients – under damped, over damped and critically damped conditions.

Single Phase A.C. Circuits:

Generation of single phase a.c. voltage and determination of average (mean) and RMS (effective) values of voltage and current with special reference to sinusoidal waveforms; Form factor and peak factor for various waves.

Representation of sinusoidal time varying quantities as phasors; concepts of reactance, impedance and their representation in complex forms using j operator.

Steady state analysis of series R-L-C circuit & its phasor diagram.

Concept of power & power factor; expression of power in complex notation.

Concept of admittance, susceptance in parallel circuits; calculation of branch currents in parallel circuits.

Analysis of series parallel circuits & phasor diagrams.

Resonance in series and parallel circuits.

Three phase A.C. Circuits:

Generation of 3-phase balanced sinusoidal voltage; star & delta connections; line & phase quantities (current & voltage).

Solution of 3-phase star/delta circuits with balanced supply voltage and balanced load; phasor diagram; 3-phase, 4-wire circuits.

Measurement of three phase power by two wattmeter method; phasor diagram with balanced load and determination of load power factor from wattmeter readings.

Magnetic Circuit:

Ampere circuital law; magnetic circuit & its similarity with electric circuits; solution of series, parallel & series parallel magnetic circuits.

Iron losses – hysteresis & eddy current losses; relationship between B-H loop & hysteresis loss.

Energy stored in a magnetic field and force of attraction between pole faces.

Transformer:

Constructional features and principle of operation; concept of ideal transformer under no load & loaded conditions; its equivalent circuit. Practical transformer rating & its equivalent circuit.

Regulation – definition & importance; derivation of expression for it: Losses & efficiency, condition for maximum efficiency.

O.C & S.C. tests and determination of equivalent circuit parameters. Various types of three phase connections of transformers.

Autotransformer – principle of operation & relative advantages & disadvantages over a two winding transformer.

Rotating Machines:

Introduction of general constructional features (stator, rotor & air gap); conditions for production of steady electromagnetic torque.

Multi polar machine & concept of mechanical & electrical angle and their relation; importance of the relation n = 2f/p.

Expression for generated emf in a coil rotating relative to a field.

Three phase induction motor:

Elementary balanced 3-phase distributed winding & production of revolving magnetic field; comment on its strength, speed and direction of rotation.

Constructional features and principle of operation; types of induction motors; definition of slip and its importance; relation between stator & rotor frequencies.

Per phase equivalent circuit; relation between air gap power, rotor copper loss and mechanical power developed; expression for electromagnetic torque developed.

Torque-slip characteristic, stable & unstable zones; modification of torque-slip characteristic for supply voltage, rotor resistance and frequency variation.

Basic principles of starting induction motor by direct on line, reactor, autotransformer, star-delta and rotor resistance starters.

D.C. Machines:

Constructional features; elementary lap & wave windings; parallel paths in armature circuit.

EMF & torque expressions and their uses in both generating & motoring modes.

Classification of d.c. generators; characteristics of shunt, separately and compound generator; armature reaction & its effect.

Classification of d.c motors; characteristics of shunt & series motors. Starting of d.c shunt motor; 3-point starter for shunt motor.

Speed control of shunt and series motors; field of applications.

Measuring Instruments:

DC PMMC instruments – constructional feature and principle of operation; moving iron meters – construction and principle of operation.

Dynamometer type wattmeter; induction type energy meter construction & principle of operation.