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Synchronous Motors
A synchronous motor is cheaper than 3-phase induction motor for _____
None of the listed here
High speed, high output
High speed, low output
Low speed, high output
None of the listed here
High speed, high output
High speed, low output
Low speed, high output
Answer
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Related Question
Synchronous Motors
The duration of sudden short circuit test on synchronous motor is usually about
One minute
One second
One hour
None of the listed here
One minute
One second
One hour
None of the listed here
Answer
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Synchronous Motors
While starting a salient pole synchronous motor by induction motor action and connecting field discharge resistance across field, starting and accelerting torque is produced by
induction motor torque in damper winding
eddy current and hysteresis torque in pole faces
induction motor torque in field winding
All of the listed here
induction motor torque in damper winding
eddy current and hysteresis torque in pole faces
induction motor torque in field winding
All 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 fail to pull into step
Will overheat in spots
Will refused ro start
Will not come upto speed
Will fail to pull into step
Will overheat in spots
Will refused ro start
Will not come upto speed
Answer
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Synchronous Motors
A synchronous machine with large air gap has
all of the listed here
a higher synchronizing power which makes the machine less sensitive to load variations
a higher value of stability limit
a small value of inherent regulation
all of the listed here
a higher synchronizing power which makes the machine less sensitive to load variations
a higher value of stability limit
a small value of inherent regulation
Answer
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Synchronous Motors
A 50 Hz synchronous motor runs at 200 rpm. The number of salient poles on the rotor are______
16
36
30
None of the listed here
16
36
30
None of the listed here
Answer
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