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Synchronous Motors

Synchronous Motors
A synchronous motor can be used as a synchronous capacitor when it is

Over loaded
Over excited
Under loaded
Under excited

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Synchronous Motors
When load on an over-excited or under excited synchronous motor is increased, rate of change of its armature current as compared with that of power factor is

less
more
twice
equal

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Synchronous Motors
If one phase of a 3 phase synchronous motor is short circuited, motor

Will fail to pull into step
Will refused ro start
Will not come upto speed
Will overheat in spots

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Synchronous Motors
A synchronous motor working at leading power factor can be used as

Phase advancer
Voltage booster
Noise generator
Mechanical synchronizer

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Synchronous Motors
The back emf in the stator of a synchronous motor depends on

Flux density
Rotor speed
None of the listed here
Rotor excitation

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Synchronous Motors
For the same active power consumed, the stator current of a synchronous motor is ______ that of a 3 phase induction motor.

None of the listed here
The same as
More than
Less than

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