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Synchronous Motors
The duration of sudden short-circuit test on a synchronous motor is usually about
one hour
one minute
None of these
one second
one hour
one minute
None of these
one second
Answer
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Related Question
Synchronous Motors
The shaft of synchronous motor is made of
Chrome steel
Alcino
Stainless steel
Mild steel
Chrome steel
Alcino
Stainless steel
Mild steel
Answer
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Synchronous Motors
The rotor of synchronous motor is excited with direct current when the motor _____
Is at standstill
Approches half synchronous speed
None of the listed here
Approches synchronous speed
Is at standstill
Approches half synchronous speed
None of the listed here
Approches synchronous speed
Answer
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Synchronous Motors
The pull out torque of a synchronous motor will ______ as the field excitation is increased.
Decrease
Increase
Remain unchanged
None of the listed here
Decrease
Increase
Remain unchanged
None of the listed here
Answer
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Synchronous Motors
In a synchronous motor, the forced vibrations will be maximum when driving
A centrifugal pump
Any of the listed here
A centrifugal blower
A reciprocating air compressor
A centrifugal pump
Any of the listed here
A centrifugal blower
A reciprocating air compressor
Answer
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Synchronous Motors
A synchronous machine with large air gap has
a higher value of stability limit
a small value of inherent regulation
a higher synchronizing power which makes the machine less sensitive to load variations
all of the listed here
a higher value of stability limit
a small value of inherent regulation
a higher synchronizing power which makes the machine less sensitive to load variations
all of the listed here
Answer
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