AC Machines — Winter 2020

Explain two bright one dark lamp method of synchronization.

What do you mean by auto synchronous motor?

Explain the phenomena of crawling and cogging in induction motor

iDnedsuccrtiiboen tmheo teofrf.e ct of armature reaction with zero lagging power factor in case of a synchronous generator

Derive the equation of electromagnetic torque for a three phase induction motor with usual notations from first principles.

Drive the expression for electromagnetic torque for three phase induction motor with usual notations from first principals

Define the voltage regulation of alternator

Explain the construction of a salient pole synchronous machine.

Explain the parallel operation of two alternators.

Define pitch factor and distribution factor of alternator

Drive the emf equation of alternator

List the methods of determination of voltage regulation of an alternator. Describe any one of them in detail.

What is harmonic torque

Discuss the procedure to perform no load and blocked rotor tests on a three phase induction motor.

Explain the procedure to construct the circle diagram of induction motor. Also describe the method to determine losses, efficiency and slip at full load condition using circle diagram.

What is synchronization

Briefly explain V-curves of synchronous motor.

Explain with reason why synchronous motor is not self-starting. Discuss the methods of starting the synchronous motor.

Draw the schematic diagram and explain the principle of induction generator

Explain the construction and working of universal motor.

Why single phase motor is not self-starting? explain the double field revolving theory in relation to single phase AC motors

Briefly describe the construction and working of linear induction motor.

Explain hunting in synchronous machine

Draw the schematic diagram and explain the construction and working of shaded pole single phase motor. .