Electrical Engineering MCQs

Page No. 248

When the excitation of an unloaded salient pole synchronous motor suddenly gets disconnected______________?


athe motor stops


bit runs as a reluctance motor at the same speed


c it runs as a reluctance motor at a lower speed


dnone of the above


View Answer the motor stops

A synchronous motor can be used as a synchronous capacitor when it is____________?


a under-loaded


bover-loaded


cunder-excited


dover-excited


View Answer over-excited

Mostly, synchronous motors are of_____________?


aalternator type machines


b induction type machines


c salient pole type machines


dsmooth cylindrical type machines



The working of a synchronous motor is similar to_____________?


agear train arrangement


btransmission of mechanical power by shaft


cdistribution transformer


dturbine



In a synchronous motor, the magnitude of stator back e.m.f. & depends on_______________?


ad.c. excitation only


b speed of the motor


cload on the motor


dboth the speed and rotor flux


View Answer d.c. excitation only

The back e.m.f. of a synchronous motor depends on______________?


aspeed


b load


c load angle


dall of the above


View Answer load angle

A synchronous motor can be made self starting by providing?


adamper winding on rotor poles


bdamper winding on stator


cdamper winding on stator as well as rotor poles


dnone of the above


View Answer none of the above

The shaft of synchronous motor is made of____________?


amild steel


bchrome steel


calnico


dstainless steel


View Answer mild steel

The operating speed of a synchronous motor can be changed to new fixed value by___________?


achanging the load


bchanging the supply voltage


cchanging frequency


dusing brakes


View Answer changing frequency

The maximum power developed in a synchronous motor occurs at a coupling angle of____________?


a30°


b 60°


c90°


d180°


View Answer 90°

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