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Synchronous Motors
When pull-out torque occurs in a synchronous motor, the poles of the rotor are _______
45° (electrical) behind stator poles
None of the listed here
Coincident with statorbpoles
Mid way between N and S poles of stator
45° (electrical) behind stator poles
None of the listed here
Coincident with statorbpoles
Mid way between N and S poles of stator
Answer
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Related Question
Synchronous Motors
A synchronous motor runs at only one speed because it ______
Has a damper winding
Is a doubly fed machine
None of the listed here
Has no losses
Has a damper winding
Is a doubly fed machine
None of the listed here
Has no losses
Answer
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Synchronous Motors
In a synchronous motor, the rotor copper loss are met by ______
Armature input
Supply lines
Dc source
Motor input
Armature input
Supply lines
Dc source
Motor input
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 higher synchronizing power which makes the machine less sensitive to load variations
A small value of inherent regulation
A higher value of stability limit
All of the listed here
A higher synchronizing power which makes the machine less sensitive to load variations
A small value of inherent regulation
Answer
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Synchronous Motors
The speed of a synchronous motor can be changed by varying _______
Mechanical load
None of the listed here
Field excitation
Supply frequency
Mechanical load
None of the listed here
Field excitation
Supply frequency
Answer
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Synchronous Motors
The ratio of starting torque to running torque in a synchronous motor is
Infinity
One
Zero
Two
Infinity
One
Zero
Two
Answer
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