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Synchronous Motors
A synchronous motor runs at only one speed because it ______
Is a doubly fed machine
Has no losses
None of the listed here
Has a damper winding
Is a doubly fed machine
Has no losses
None of the listed here
Has a damper winding
Answer
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Related Question
Synchronous Motors
When a synchronous motor is on no load, the torque angle is about ________
30° electrical
90° electrical
45° electrical
0° electrical
30° electrical
90° electrical
45° electrical
0° electrical
Answer
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Synchronous Motors
The pull out torque of a synchronous motor is generally ______ times its full-load torque.
5 to 10
1.25 to 3.5
0.5
6 to 9
5 to 10
1.25 to 3.5
0.5
6 to 9
Answer
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Synchronous Motors
A synchronous motor will always stop when
Supply voltage fluctuates
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
Answer
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Synchronous Motors
By which of the following methods the constant speed of a synchronous motor can be changed to new fixed value ?
By changing the supply frequency
By changing the applied voltage
By changing the load
By interchanging any two phases
By changing the supply frequency
By changing the applied voltage
By changing the load
By interchanging any two phases
Answer
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Synchronous Motors
The power factor of a synchronous motor is better than that of induction motor because
synchronous motor runs at synchronous speed
stator supply is relieved of responsibility of producing magnetic field
synchronous motor has large air gap
mechanical load on the motor can be adjusted
synchronous motor runs at synchronous speed
stator supply is relieved of responsibility of producing magnetic field
synchronous motor has large air gap
mechanical load on the motor can be adjusted
Answer
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