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Synchronous Motors
In a synchronous motor, the forced vibrations will be maximum when driving
Any of the listed here
A reciprocating air compressor
A centrifugal pump
A centrifugal blower
Any of the listed here
A reciprocating air compressor
A centrifugal pump
A centrifugal blower
Answer
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Related Question
Synchronous Motors
When the field of a synchronous motor is under-excited, the power factor will be
zero
unity
leading
lagging
zero
unity
leading
lagging
Answer
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Synchronous Motors
The efficiency of a properly designed synchronous motor will usually fall in range
75 to 80%
60 to 70%
99 to 99.5%
85 to 95%
75 to 80%
60 to 70%
99 to 99.5%
85 to 95%
Answer
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Synchronous Motors
An over excited synchronous motor is used for
Power factor corrections
Low torque loads
Fluctuating loads
Variable speed loads
Power factor corrections
Low torque loads
Fluctuating loads
Variable speed loads
Answer
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Synchronous Motors
When load on an over-excited or under excited synchronous motor is increased, rate of change of its armature current as compared with that of power factor is
less
equal
twice
more
less
equal
twice
more
Answer
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Synchronous Motors
For the same active power consumed, the stator current of a synchronous motor is ______ that of a 3 phase induction motor.
Less than
None of the listed here
The same as
More than
Less than
None of the listed here
The same as
More than
Answer
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