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Synchronous Motors

Synchronous Motors
The pull out torque of a synchronous motor is generally ______ times its full-load torque.

5 to 10
0.5
6 to 9
1.25 to 3.5

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

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

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Synchronous Motors
When the field of a synchronous motor is under-excited, the power factor will be

leading
lagging
unity
zero

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Synchronous Motors
The power factor correction capability of a loaded synchronous motor _____ with the increases in mechanical load.

Decreases
Increases
Remains unchanged
None of the listed here

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Synchronous Motors
A synchronous motor is a ______ motor.

Variable speed
None of the listed here
Singly fed
Variable pf

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