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Synchronous Motors

Synchronous Motors
The percentage slip in case of a synchronous motor is

0.005
zero
1
0.01

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Synchronous Motors
A synchronous motor can develop synchronous torque

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

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Synchronous Motors
The pull out torque of a synchronous motor is generally ______ times its full-load torque.

0.5
5 to 10
6 to 9
1.25 to 3.5

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Synchronous Motors
When a synchronous motor is pulled out of synchronism, the stator current ________

Is increased too much
Become zero
Remains unchanged
Is decreased too much

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Synchronous Motors
A synchronous machine with large air gap has

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

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Synchronous Motors
Change of D.C. excitation of a synchronous motor changes

Any of the above
Motor speed
Power factor of power drawn by the motor
Applied voltage of the motor

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MORE MCQ ON Synchronous Motors

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