MID SEM-2 SYLLABUS SUBJECT : A C MACHINES (2140906) SEMESTER : 4TH

MID SEMESTER TEST SYLLABUS

SUBJECT : A C  MACHINES  (2140906)

SEMESTER : 4^TH                                     

Ch-1  : 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,  Starters of poly-phase induction motor  including soft starter, Methods of speed control of 3- phase motor,  Effect of harmonics, Harmonic torques, Cogging & Crawling, Ch-2 Single phase A. C. motors: Double field revolving theory, Starting & running performance of 1-phase induction Motor, Equivalent circuit of 1phase induction motor, Types of single phase motors, Principle and operation of split phase, Resistance start, Capacitor start and capacitor start & run induction   motor, Shaded pole induction motor, Fractional horse power motors.

Ch-3 : Synchronous Generator:

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,

Ch-4 : Synchronous Motor:

Methods of starting of synchronous motors, Different torques in

Synchronous motor, Stability, Synchronous condenser, Synchronous

 phase modifiers, V-curves and O-curves of Synchronous motors,