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Synchronous Motors

Synchronous Motors
If the field of a synchronous motor is underexcited, the power factor will be

unity
zero
leading
lagging

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Synchronous Motors
A synchronous motor is a ______ motor.

Variable speed
Variable pf
None of the listed here
Singly fed

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

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

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Synchronous Motors
Mostly, synchronous motors are of

Salient pole type machines
Induction type machines
Smooth cylindrical type machines
Alternator type machines

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Synchronous Motors
For power factor correction, synchronous motors operate at

no-load and greatly over-excited fields
normal load with minimum excitation
no-load and under-excited fields
normal load with zero excitation

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Synchronous Motors
When a unity pf synchronous motor is operated at a leading pf, it results in _______

None of the listed here
More than rated horseppwer output
More than rated rotor current
Less than rated horsepower output

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