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Synchronous Motors

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

Flux density
Rotor excitation
None of the listed here
Rotor speed

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

45°
0°
30°
75°

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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 can develop synchronous torque

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

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Synchronous Motors
A rotary converter can also be run as a

Dc series generator
Synchronous motor
Dc compound generator
Dc shunt generator

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

unity
zero
leading
lagging

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