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Synchronous Motors
The rotor of synchronous motor is excited with direct current when the motor _____
None of the listed here
Approches half synchronous speed
Is at standstill
Approches synchronous speed
None of the listed here
Approches half synchronous speed
Is at standstill
Approches synchronous speed
Answer
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Related Question
Synchronous Motors
The direction of rotation of a synchronous motor can be reversed by reversing,
Polarity of rotor poles
Supply phase sequence
Current to field winding
None of the listed here
Polarity of rotor poles
Supply phase sequence
Current to field winding
None of the listed here
Answer
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Synchronous Motors
An important advantage of a synchronous motor over wound round induction motor is that
None of these
its speed may be controlled more easily
its power factor may be varied at will
its speed is independent of supply frequency
None of these
its speed may be controlled more easily
its power factor may be varied at will
its speed is independent of supply frequency
Answer
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Synchronous Motors
For power factor correction, synchronous motors operate at
normal load with minimum excitation
no-load and under-excited fields
no-load and greatly over-excited fields
normal load with zero excitation
normal load with minimum excitation
no-load and under-excited fields
no-load and greatly over-excited fields
normal load with zero excitation
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 small value of inherent regulation
a higher value of stability limit
all of the listed here
a higher synchronizing power which makes the machine less sensitive to load variations
a small value of inherent regulation
a higher value of stability limit
Answer
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Synchronous Motors
In a synchronous motor, the forced vibrations will be maximum when driving
A centrifugal pump
A reciprocating air compressor
A centrifugal blower
Any of the listed here
A centrifugal pump
A reciprocating air compressor
A centrifugal blower
Any of the listed here
Answer
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