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Synchronous Motors

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

Infinity
One
Two
Zero

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

75°
45°
0°
30°

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

Windage loss
Bearing friction loss
Copper loss
Core loss

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Synchronous Motors
The rotor of synchronous motor is excited with direct current when the motor _____

None of the listed here
Is at standstill
Approches half synchronous speed
Approches synchronous speed

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Synchronous Motors
The standard full-load power factor ratings for synchronous motors are

unity or zero
zero or 0.8 leading
unity or 0.8 leading
unity or 0.8 lagging

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Synchronous Motors
The duration of sudden short-circuit test on a synchronous motor is usually about

one hour
None of these
one second
one minute

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