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Synchronous Motors
A synchronous motor connected to infinite bus-bars has at constant full load, 100% excitation and unity power factor. On changing the excitation only, the armature current will have
no change of power factor
leading power factor with over-excitation
leading power factor with under-excitation
lagging power factor with over-excitation
no change of power factor
leading power factor with over-excitation
leading power factor with under-excitation
lagging power factor with over-excitation
Answer
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Related Question
Synchronous Motors
In order to to reverse the direction of a synchronous motor, _______
Reduce dc field excitation to zero
Change supply frequency
None of the listed here
Interchange any two stator lines
Reduce dc field excitation to zero
Change supply frequency
None of the listed here
Interchange any two stator lines
Answer
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Synchronous Motors
In a synchronous motor which loss varies with load ?
Bearing friction loss
Windage loss
Core loss
Copper loss
Bearing friction loss
Windage loss
Core loss
Copper loss
Answer
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Synchronous Motors
Synchronous motors are generally used in application requiring _______
Frequent stopping
Sudden application of heavy loads
Infrequent starting
Variable speed
Frequent stopping
Sudden application of heavy loads
Infrequent starting
Variable speed
Answer
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Synchronous Motors
The percentage slip in case of a synchronous motor is
zero
0.005
0.01
1
zero
0.005
0.01
1
Answer
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Synchronous Motors
A synchronous motor develop maximum power when load angle is
120°
60°
45°
90°
120°
60°
45°
90°
Answer
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