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Synchronous Motors

Synchronous Motors
In a synchronous motor which loss varies with load ?

Copper loss
Bearing friction loss
Core loss
Windage loss

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

Two
Zero
One
Infinity

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Synchronous Motors
A synchronous motor runs at only one speed because it ______

None of the listed here
Has no losses
Has a damper winding
Is a doubly fed machine

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

60°
45°
90°
120°

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Synchronous Motors
A synchronous motor will always stop when

Supply voltage fluctuates
Load in motor varies
Supply voltage frequency changes
Excitation winding gets disconnected

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

45°
60°
120°
90°

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