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Synchronous Motors
The power factor correction capability of a loaded synchronous motor _____ with the increases in mechanical load.
Remains unchanged
None of the listed here
Increases
Decreases
Remains unchanged
None of the listed here
Increases
Decreases
Answer
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Related Question
Synchronous Motors
In a synchronous motor it the back e.m.f. generated in the armature at noload is approximately equal to the applied voltage, then
the excitation is said to be zero per cent
the motor is said to be fully loaded
the excitation is said to be hundred per cent
the torque generated is maximum
the excitation is said to be zero per cent
the motor is said to be fully loaded
the excitation is said to be hundred per cent
the torque generated is maximum
Answer
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Synchronous Motors
A synchronous motor with large air gap has
A higher value of stability limit
All of the listed here
A small value of inherent regulation
A higher synchronizing power which makes the machine less sensitive to load variations
A higher value of stability limit
All of the listed here
A small value of inherent regulation
A higher synchronizing power which makes the machine less sensitive to load variations
Answer
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Synchronous Motors
Damper winding in a synchronous motor________
Increases hunting of the motor
Serves to start the motor
Reduces windage losses
Improve pf of the motor
Increases hunting of the motor
Serves to start the motor
Reduces windage losses
Improve pf of the motor
Answer
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Synchronous Motors
The capacity of a synchronous capacitor is generally in the range of
kVAR
MVAR
None of the listed here
VAR
kVAR
MVAR
None of the listed here
VAR
Answer
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Synchronous Motors
If the field circuit of an unloaded salientpole synchronous motor gets suddenly open-circuited, then
it runs at a slower speed
it runs at a very high speed
the motor stops
it continues to run at the same speed
it runs at a slower speed
it runs at a very high speed
the motor stops
it continues to run at the same speed
Answer
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