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Synchronous Motors

Synchronous Motors
A synchronous motor can be started by

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

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Synchronous Motors
When the field of a synchronous motor is under-excited, the power factor will be

leading
zero
unity
lagging

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Synchronous Motors
The pull out torque of a practical synchronous motor will occur when the torque angle is about _____

75°
0°
30°
45°

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Synchronous Motors
The speed regulation of a synchronous motor is always

1%
Zero
Positive
0.5%

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Synchronous Motors
In a synchronous motor, the maximum power developed depends on all of the following except

supply voltage
direction of rotation
maximum value of coupling angle
rotor excitation

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Synchronous Motors
The rotor of a synchronous motor is

None of the listed here
Salient pole type
Nonsalient pole type
Identical to that of a dc motor

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