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SYNCHRONOUS MOTORS

Synchronous Motors
Hunting in a synchronous motor can not be due to

Variable supply frequency
Variable frequency
Windage friction
Variable load

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Synchronous Motors
Which of the following motors is non self starting?

Dc series motor
Wound rotor induction motor
Synchronous motor
Squirrel cage induction motor

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Synchronous Motors
The ratio of starting torque to running torque in a synchronous motor is

Two
One
Zero
Infinity

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Synchronous Motors
The magnitude of field flux in a 3-phase synchronous motor

Varies with power factor
Varies with the load
Varies with speed
Remains constant at all loads

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Synchronous Motors
A rotary converter can also be run as a

Dc compound generator
Synchronous motor
Dc shunt generator
Dc series generator

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