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Synchronous Motors
In a synchronous motor which loss varies with load ?
Windage loss
Core loss
Bearing friction loss
Copper loss
Windage loss
Core loss
Bearing friction loss
Copper loss
Answer
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Related Question
Synchronous Motors
The duration of sudden short-circuit test on a synchronous motor is usually about
one hour
one second
one minute
None of these
one hour
one second
one minute
None of these
Answer
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Synchronous Motors
The speed of a synchronous motor
Decreases as the load decreases
None of the listed here
Always remains constant
Increases as the load increases
Decreases as the load decreases
None of the listed here
Always remains constant
Increases as the load increases
Answer
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Synchronous Motors
The back e.m.f. of a synchronous motor depends on
All of these
load
load angle
speed
All of these
load
load angle
speed
Answer
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Synchronous Motors
In order to to reverse the direction of a synchronous motor, _______
Reduce dc field excitation to zero
Change supply frequency
Interchange any two stator lines
None of the listed here
Reduce dc field excitation to zero
Change supply frequency
Interchange any two stator lines
None of the listed here
Answer
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Synchronous Motors
If one phase of a 3 phase synchronous motor is short circuited, motor
Will refused ro start
Will not come upto speed
Will overheat in spots
Will fail to pull into step
Will refused ro start
Will not come upto speed
Will overheat in spots
Will fail to pull into step
Answer
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