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Synchronous Motors
An over excited synchronous motor is used for
Power factor corrections
Fluctuating loads
Low torque loads
Variable speed loads
Power factor corrections
Fluctuating loads
Low torque loads
Variable speed loads
Answer
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Related Question
Synchronous Motors
While starting a salient pole synchronous motor by induction motor action and connecting field discharge resistance across field, starting and accelerting torque is produced by
eddy current and hysteresis torque in pole faces
induction motor torque in field winding
All of the listed here
induction motor torque in damper winding
eddy current and hysteresis torque in pole faces
induction motor torque in field winding
All of the listed here
induction motor torque in damper winding
Answer
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Synchronous Motors
If the synchronous motor, properly synchronised to the supply is running on no load and is having negligible loss then
the back e.m.f. will be more than the supply voltage
the stator current will be zero
the stator current will be very small
the stator current will be very high
the back e.m.f. will be more than the supply voltage
the stator current will be zero
the stator current will be very small
the stator current will be very high
Answer
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Synchronous Motors
Change of D.C. excitation of a synchronous motor changes
Any of the above
Power factor of power drawn by the motor
Motor speed
Applied voltage of the motor
Any of the above
Power factor of power drawn by the motor
Motor speed
Applied voltage of the motor
Answer
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Synchronous Motors
Dust and dirt accumulation on motor winding will result in
Eddy current flow
Rise in winding temperature
Increased core losses
Shorting of coils
Eddy current flow
Rise in winding temperature
Increased core losses
Shorting of coils
Answer
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Synchronous Motors
A synchronous machine with low value short circuit ratio has
Lower stability limit
High stability limit
Good voltage regulation
Good speed regulation
Lower stability limit
High stability limit
Good voltage regulation
Good speed regulation
Answer
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