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Synchronous Motors

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

6 to 9
5 to 10
1.25 to 3.5
0.5

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Synchronous Motors
In case one phase of a three-phase synchronous motor is short-circuited the motor will

take less than the rated load
run at 2/3 of synchronous speed
not start
run with excessive vibrations

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Synchronous Motors
A synchronous motor can be started by

All of the listed here
Provinding damper winding
Dc compound motor
Pony motor

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

1
0.005
0.01
zero

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Synchronous Motors
The mechanical power developed by a synchronous motor is independent of _________.

Field excitation
Torque angle
Speed
Applied stator voltage

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

one hour
one minute
one second
None of these

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