MID SEM TEST SYLLABUS
SUBJECT : A C MACHINES
MID TEST SYLLABUS
SUBJECT CODE : 2140906
SEMESTER : 4TH
Ch-1
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Poly-phase Induction Motor:
Construction, Types of motor,
Working principle, Rotating magnetic field.
Operating parameters at
different load, No-load & blocked rotor test, Equivalent circuit, Phasor
diagram, Circle diagram, Efficiency and slip scale with the help of circle
diagram, Effect of rotor resistance on performance of motor, Double cage
motor and its equivalent circuit, Introduction to machine dynamics. Starters
of poly-phase induction motor including soft starter, Methods of speed
control of 3- phase motor, Schematic diagram and advantages of Variable
Voltage Variable Frequency drive. Electrical transients in induction machine,
Magnetic levitation : Principle, advantages and application of linear
induction motor. Effect of harmonics, Harmonic torques, Cogging &
Crawling, Effect of unbalanced voltages on performance of motor. Performance
of motor with variable voltage and frequency. Testing of induction motor as per
IS, Energy efficient motors.
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Ch-2 Synchronous Machines:
Construction, Types,
Applications, Working principle.
Equation of induced emf with and without harmonics in MMF,
pitch factor and distribution factor, MMF of distributed windings, Torque
equation, Machine efficiency, Armature reaction and its compensation, Short
circuit ratio, Effect of change in excitation, Effect of change in torque and
speed, Voltage regulation, Determination of voltage regulation by Synchronous
impedance method, MMF method, ZPF method and AIEE method, Synchronization :
Importance and Methods of synchronization. Operating characteristic, Load angle
and Power flow equations, Capability curves, Two reaction model of Salient pole
machines, Parallel operation, Load sharing between parallel connected
generators, Effect of unequal voltages & unequal percentage impedance,
Governor characteristics, Introduction to single phase generators, Slip test
for measurement of direct axis and quadrature axis reactance for salient pole
machine, Sudden short circuit of Synchronous machine, Hunting of synchronous
machines and its prevention.
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