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Synchronous Motors
A synchronous motor delivers reactive power when ______
Under excited
Over excited
Normally excited
None of the listed here
Under excited
Over excited
Normally excited
None of the listed here
Answer
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Related Question
Synchronous Motors
If the synchronous motor, properly synchronised to the supply is running on no load and is having negligible loss then
the back e.m.f. will be more than the supply voltage
the stator current will be zero
the stator current will be very small
the stator current will be very high
the back e.m.f. will be more than the supply voltage
the stator current will be zero
the stator current will be very small
the stator current will be very high
Answer
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Synchronous Motors
In order to to reverse the direction of a synchronous motor, _______
Change supply frequency
None of the listed here
Reduce dc field excitation to zero
Interchange any two stator lines
Change supply frequency
None of the listed here
Reduce dc field excitation to zero
Interchange any two stator lines
Answer
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Synchronous Motors
A synchronous motor runs at only one speed because it ______
Has a damper winding
None of the listed here
Has no losses
Is a doubly fed machine
Has a damper winding
None of the listed here
Has no losses
Is a doubly fed machine
Answer
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Synchronous Motors
When a synchronous motor is pulled out of synchronism, the stator current ________
Remains unchanged
Is increased too much
Is decreased too much
Become zero
Remains unchanged
Is increased too much
Is decreased too much
Become zero
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 overheat in spots
Will fail to pull into step
Will not come upto speed
Will refused ro start
Will overheat in spots
Will fail to pull into step
Will not come upto speed
Answer
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