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Synchronous Motors

Synchronous Motors
A three phase synchronous motor will have

Three slip rings
No slip rings
Two slip rings
One slip rings

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Synchronous Motors
The efficiency of a properly designed synchronous motor will usually fall in range

60 to 70%
75 to 80%
99 to 99.5%
85 to 95%

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Synchronous Motors
By which of the following methods the constant speed of a synchronous motor can be changed to new fixed value ?

By changing the applied voltage
By changing the supply frequency
By interchanging any two phases
By changing the load

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

Copper loss
Windage loss
Bearing friction loss
Core loss

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Synchronous Motors
For power factor correction, synchronous motors operate at

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

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Synchronous Motors
The speed of a synchronous motor can be changed by varying _______

Supply frequency
Mechanical load
None of the listed here
Field excitation

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