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Synchronous Motors

Synchronous Motors
A synchronous motor delivers reactive power when ______

Under excited
Normally excited
Over excited
None of the listed here

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Synchronous Motors
If the field of a synchronous motor is underexcited, the power factor will be

unity
zero
leading
lagging

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Synchronous Motors
In a synchronous motor, the forced vibrations will be maximum when driving

A centrifugal blower
A reciprocating air compressor
Any of the listed here
A centrifugal pump

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Synchronous Motors
A synchronous motor can develop synchronous torque

only at synchronous speed
when under loaded
below or above synchronous speed
while over-excited

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Synchronous Motors
Mostly, synchronous motors are of

Salient pole type machines
Smooth cylindrical type machines
Induction type machines
Alternator type machines

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Synchronous Motors
In order to to reverse the direction of a synchronous motor, _______

Change supply frequency
None of the listed here
Reduce dc field excitation to zero
Interchange any two stator lines

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