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Synchronous Motors
The standard full-load power factor ratings for synchronous motors are
zero or 0.8 leading
unity or zero
unity or 0.8 leading
unity or 0.8 lagging
zero or 0.8 leading
unity or zero
unity or 0.8 leading
unity or 0.8 lagging
Answer
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Related Question
Synchronous Motors
In order to to reverse the direction of a synchronous motor, _______
Change supply frequency
Interchange any two stator lines
Reduce dc field excitation to zero
None of the listed here
Change supply frequency
Interchange any two stator lines
Reduce dc field excitation to zero
None of the listed here
Answer
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Synchronous Motors
The back e.m.f. of a synchronous motor depends on
load angle
speed
All of these
load
load angle
speed
All of these
load
Answer
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Synchronous Motors
A synchronous motor with large air gap has
A higher synchronizing power which makes the machine less sensitive to load variations
All of the listed here
A small value of inherent regulation
A higher value of stability limit
A higher synchronizing power which makes the machine less sensitive to load variations
All of the listed here
A small value of inherent regulation
A higher value of stability limit
Answer
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Synchronous Motors
The induced e.m.f. in a synchronous motor working on leading power factor will be
more than the supply voltage
None of these
equal to the supply voltage
less than the supply voltage
more than the supply voltage
None of these
equal to the supply voltage
less than the supply voltage
Answer
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Synchronous Motors
Change of D.C. excitation of a synchronous motor changes
Power factor of power drawn by the motor
Applied voltage of the motor
Any of the above
Motor speed
Power factor of power drawn by the motor
Applied voltage of the motor
Any of the above
Motor speed
Answer
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