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Synchronous Motors

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

Rotor excitation
None of the listed here
Rotor speed
Flux density

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Synchronous Motors
When load on a synchronous motor is increased, its armature current is increased provided, it is ______

Normally excited
Over-excited
Under-excited
All of these

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Synchronous Motors
A synchronous motor can be started by

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

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Synchronous Motors
An under excited synchronous motor behaves as_______

None of the listed here
A resistor
A capacitor
An inductor

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

one minute
one hour
None of these
one second

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

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

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