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Synchronous Motors
While running, a synchronous motor is compelled to run at synchronous speed because of _______
Induced emf in rotor field winding by stator flux
Damper winding in its pole faces
Compulsion due to lenz's law
Magnetic locking between stator and rotor poles
Induced emf in rotor field winding by stator flux
Damper winding in its pole faces
Compulsion due to lenz's law
Magnetic locking between stator and rotor poles
Answer
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Related Question
Synchronous Motors
Dust and dirt accumulation on motor winding will result in
Shorting of coils
Rise in winding temperature
Eddy current flow
Increased core losses
Shorting of coils
Rise in winding temperature
Eddy current flow
Increased core losses
Answer
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Synchronous Motors
In a synchronous motor, the maximum power developed depends on all of the following except
rotor excitation
direction of rotation
maximum value of coupling angle
supply voltage
rotor excitation
direction of rotation
maximum value of coupling angle
supply voltage
Answer
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Synchronous Motors
A synchronous motor will always stop when
Supply voltage frequency changes
Load in motor varies
Excitation winding gets disconnected
Supply voltage fluctuates
Supply voltage frequency changes
Load in motor varies
Excitation winding gets disconnected
Supply voltage fluctuates
Answer
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Synchronous Motors
Mostly, synchronous motors are of
Smooth cylindrical type machines
Salient pole type machines
Induction type machines
Alternator type machines
Smooth cylindrical type machines
Salient pole type machines
Induction type machines
Alternator type machines
Answer
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Synchronous Motors
When pull-out torque occurs in a synchronous motor, the poles of the rotor are _______
Mid way between N and S poles of stator
None of the listed here
45° (electrical) behind stator poles
Coincident with statorbpoles
Mid way between N and S poles of stator
None of the listed here
45° (electrical) behind stator poles
Coincident with statorbpoles
Answer
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