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Synchronous Motors

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

Over loaded
Under loaded
Under excited
Over excited

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Synchronous Motors
Damper winding in a synchronous motor________

Increases hunting of the motor
Reduces windage losses
Serves to start the motor
Improve pf of the motor

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Synchronous Motors
The duration of sudden short circuit test on synchronous motor is usually about

One hour
One second
None of the listed here
One minute

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

1
zero
0.01
0.005

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Synchronous Motors
A synchronous motor runs at speed ranging from ______

150 to 1800 rpm
1800 to 3600 rpm
3600 to 6000 rpm
None of the listed here

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Synchronous Motors
Slip rings in a synchronous motor carry

Alternating current
No current
All of the listed here
Direct current

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