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

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dnone of the above

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View Answer the motor stops

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


a under-loaded

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bover-loaded

✖


cunder-excited

✖


dover-excited

✓


View Answer over-excited

Mostly, synchronous motors are of_____________?


aalternator type machines

✖


b induction type machines

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c salient pole type machines

✓


dsmooth cylindrical type machines

✖



The working of a synchronous motor is similar to_____________?


agear train arrangement

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btransmission of mechanical power by shaft

✓


cdistribution transformer

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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

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bdamper winding on stator

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cdamper winding on stator as well as rotor poles

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dnone of the above

✓


View Answer none of the above

The shaft of synchronous motor is made of____________?


amild steel

✓


bchrome steel

✖


calnico

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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

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cchanging frequency

✓


dusing brakes

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View Answer changing frequency

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


a30°

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b 60°

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c90°

✓


d180°

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View Answer 90°

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