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Synchronous Motors
A synchronous motor can be started by
All of the listed here
Pony motor
Provinding damper winding
Dc compound motor
All of the listed here
Pony motor
Provinding damper winding
Dc compound motor
Answer
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Related Question
Synchronous Motors
For the same active power consumed, the stator current of a synchronous motor is ______ that of a 3 phase induction motor.
The same as
Less than
None of the listed here
More than
The same as
Less than
None of the listed here
More than
Answer
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Synchronous Motors
The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as
pull-in torque
pull-out torque
None of these
pull-up torque
pull-in torque
pull-out torque
None of these
pull-up torque
Answer
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Synchronous Motors
In a synchronous motor, the forced vibrations will be maximum when driving
A centrifugal blower
A reciprocating air compressor
A centrifugal pump
Any of the listed here
A centrifugal blower
A reciprocating air compressor
A centrifugal pump
Any of the listed here
Answer
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Synchronous Motors
When a synchronous motor is on no load, the torque angle is about ________
90° electrical
45° electrical
30° electrical
0° electrical
90° electrical
45° electrical
30° electrical
0° electrical
Answer
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Synchronous Motors
In a synchronous motor it the back e.m.f. generated in the armature at noload is approximately equal to the applied voltage, then
the excitation is said to be zero per cent
the torque generated is maximum
the motor is said to be fully loaded
the excitation is said to be hundred per cent
the excitation is said to be zero per cent
the torque generated is maximum
the motor is said to be fully loaded
the excitation is said to be hundred per cent
Answer
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