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Synchronous Motors

Synchronous Motors
A synchronous motor can be started by

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

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Synchronous Motors
Leading power factor synchronous motors cost ______ the unity pf motors.

More than
None of the listed here
About the same as
Less than

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

90°
45°
60°
120°

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Synchronous Motors
Power factor of a synchronous motor is unity when

The armature current is maximum
The armature current is minimum
The armature current is zero
None of the listed here

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Synchronous Motors
The speed of a synchronous motor

Increases as the load increases
Always remains constant
None of the listed here
Decreases as the load decreases

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Synchronous Motors
A synchronous motor is cheaper than 3-phase induction motor for _____

High speed, low output
Low speed, high output
None of the listed here
High speed, high output

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