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Synchronous Motors
Small synchronous motors are started by _______
None of the listed here
Pony motor
Damper winding
Variable frequency source
None of the listed here
Pony motor
Damper winding
Variable frequency source
Answer
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Related Question
Synchronous Motors
Mostly, synchronous motors are of
Smooth cylindrical type machines
Salient pole type machines
Alternator type machines
Induction type machines
Smooth cylindrical type machines
Salient pole type machines
Alternator type machines
Induction type machines
Answer
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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
Remain unchanged
Decrease
Increase
None of the listed here
Remain unchanged
Decrease
Increase
Answer
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Synchronous Motors
The pull out torque of a practical synchronous motor will occur when the torque angle is about _____
45°
0°
75°
30°
45°
0°
75°
30°
Answer
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Synchronous Motors
If the field of a synchronous motor is underexcited, the power factor will be
leading
zero
unity
lagging
leading
zero
unity
lagging
Answer
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Synchronous Motors
If one phase of a 3 phase synchronous motor is short circuited, motor
Will refused ro start
Will not come upto speed
Will overheat in spots
Will fail to pull into step
Will refused ro start
Will not come upto speed
Will overheat in spots
Will fail to pull into step
Answer
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