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Synchronous Motors

Synchronous Motors
A synchronous motor is a ______ motor.

Singly fed
Variable pf
Variable speed
None of the listed here

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Synchronous Motors
For power factor correction, synchronous motors operate at

normal load with zero excitation
no-load and greatly over-excited fields
normal load with minimum excitation
no-load and under-excited fields

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Synchronous Motors
A synchronous motor with large air gap has

All of the listed here
A higher value of stability limit
A small value of inherent regulation
A higher synchronizing power which makes the machine less sensitive to load variations

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

Voltage booster
Noise generator
Phase advancer
Mechanical synchronizer

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

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

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Synchronous Motors
When a synchronous motor is on no load, the torque angle is about ________

45° electrical
0° electrical
90° electrical
30° electrical

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