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Synchronous Motors
When a unity pf synchronous motor is operated at a leading pf, it results in _______
Less than rated horsepower output
More than rated rotor current
More than rated horseppwer output
None of the listed here
Less than rated horsepower output
More than rated rotor current
More than rated horseppwer output
None of the listed here
Answer
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Related Question
Synchronous Motors
By which of the following methods the constant speed of a synchronous motor can be changed to new fixed value ?
By interchanging any two phases
By changing the applied voltage
By changing the load
By changing the supply frequency
By interchanging any two phases
By changing the applied voltage
By changing the load
By changing the supply frequency
Answer
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Synchronous Motors
The speed of a synchronous motor can be changed by varying _______
Mechanical load
Supply frequency
None of the listed here
Field excitation
Mechanical load
Supply frequency
None of the listed here
Field excitation
Answer
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Synchronous Motors
In a synchronous motor which loss varies with load ?
Core loss
Windage loss
Copper loss
Bearing friction loss
Core loss
Windage loss
Copper loss
Bearing friction loss
Answer
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Synchronous Motors
The maximum speed variation in a 3 phase synchronous motor is
Zero
2 percent
10 percent
4 percent
Zero
2 percent
10 percent
4 percent
Answer
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Synchronous Motors
A 50 Hz synchronous motor runs at 200 rpm. The number of salient poles on the rotor are______
16
36
None of the listed here
30
16
36
None of the listed here
30
Answer
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