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Synchronous Motors
The pull out torque of a synchronous motor will ______ as the field excitation is increased.
None of the listed here
Decrease
Increase
Remain unchanged
None of the listed here
Decrease
Increase
Remain unchanged
Answer
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Related Question
Synchronous Motors
A synchronous motor working at leading power factor can be used as
Voltage booster
Noise generator
Phase advancer
Mechanical synchronizer
Voltage booster
Noise generator
Phase advancer
Mechanical synchronizer
Answer
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Synchronous Motors
When a unity pf synchronous motor is operated at a leading pf, it results in _______
None of the listed here
More than rated horseppwer output
More than rated rotor current
Less than rated horsepower output
None of the listed here
More than rated horseppwer output
More than rated rotor current
Less than rated horsepower output
Answer
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Synchronous Motors
The maximum speed variation in a 3 phase synchronous motor is
2 percent
Zero
4 percent
10 percent
2 percent
Zero
4 percent
10 percent
Answer
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Synchronous Motors
In order to to reverse the direction of a synchronous motor, _______
Reduce dc field excitation to zero
Change supply frequency
Interchange any two stator lines
None of the listed here
Reduce dc field excitation to zero
Change supply frequency
Interchange any two stator lines
None of the listed here
Answer
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Synchronous Motors
The angle between the rotor poles and stator poles, in a synchronous motor, is known as
Synchronising angle
Torque angle
Angle of retardation
Power factor angle
Synchronising angle
Torque angle
Angle of retardation
Power factor angle
Answer
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