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Synchronous Motors
When the field of a synchronous motor is under-excited, the power factor will be
unity
lagging
zero
leading
unity
lagging
zero
leading
Answer
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Related Question
Synchronous Motors
If the field of a synchronous motor is underexcited, the power factor will be
zero
lagging
leading
unity
zero
lagging
leading
unity
Answer
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Synchronous Motors
A synchronous machine with large air gap has
a small value of inherent regulation
all of the listed here
a higher synchronizing power which makes the machine less sensitive to load variations
a higher value of stability limit
a small value of inherent regulation
all of the listed here
a higher synchronizing power which makes the machine less sensitive to load variations
a higher value of stability limit
Answer
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Synchronous Motors
The rotor of synchronous motor is excited with direct current when the motor _____
Approches synchronous speed
Approches half synchronous speed
None of the listed here
Is at standstill
Approches synchronous speed
Approches half synchronous speed
None of the listed here
Is at standstill
Answer
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Synchronous Motors
The armature current of the synchronous motor has higher values for
Both higher and low excitation
Low excitation only
Higher excitation only
None of the listed here
Both higher and low excitation
Low excitation only
Higher excitation only
None of the listed here
Answer
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Synchronous Motors
The speed of a synchronous motor can be changed by varying _______
Field excitation
Supply frequency
None of the listed here
Mechanical load
Field excitation
Supply frequency
None of the listed here
Mechanical load
Answer
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