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Synchronous Motors

Synchronous Motors
A three phase synchronous motor will have

One slip rings
Two slip rings
Three slip rings
No slip rings

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Synchronous Motors
A synchronous motor develops maximum power when load angle is

45°
120°
90°
60°

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Synchronous Motors
In a synchronous motor it the back e.m.f. generated in the armature at noload is approximately equal to the applied voltage, then

the excitation is said to be hundred per cent
the excitation is said to be zero per cent
the motor is said to be fully loaded
the torque generated is maximum

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Synchronous Motors
A rotary converter can also be run as a

Dc shunt generator
Synchronous motor
Dc series generator
Dc compound generator

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Synchronous Motors
The pull out torque of a synchronous motor will ______ as the field excitation is increased.

Decrease
Remain unchanged
Increase
None of the listed here

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

Flux density
Rotor speed
None of the listed here
Rotor excitation

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