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Synchronous Motors
Dust and dirt accumulation on motor winding will result in
Eddy current flow
Rise in winding temperature
Shorting of coils
Increased core losses
Eddy current flow
Rise in winding temperature
Shorting of coils
Increased core losses
Answer
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Related Question
Synchronous Motors
A synchronous motor can be used as a synchronous capacitor when it is
Over excited
Over loaded
Under excited
Under loaded
Over excited
Over loaded
Under excited
Under loaded
Answer
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Synchronous Motors
Synchronous motors are generally used in application requiring _______
Sudden application of heavy loads
Frequent stopping
Variable speed
Infrequent starting
Sudden application of heavy loads
Frequent stopping
Variable speed
Infrequent starting
Answer
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Synchronous Motors
In a synchronous motor which loss varies with load ?
Copper loss
Bearing friction loss
Windage loss
Core loss
Copper loss
Bearing friction loss
Windage loss
Core loss
Answer
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Synchronous Motors
The duration of sudden short circuit test on synchronous motor is usually about
One minute
None of the listed here
One hour
One second
One minute
None of the listed here
One hour
One second
Answer
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Synchronous Motors
When load on an over-excited or under excited synchronous motor is increased, rate of change of its armature current as compared with that of power factor is
less
twice
more
equal
less
twice
more
equal
Answer
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