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Synchronous Motors
In a 3-phase synchronous motor, the negative phase sequence exists when the motor is
supplied with unbalanced voltage
under-loaded
over-loaded
None of these
supplied with unbalanced voltage
under-loaded
over-loaded
None of these
Answer
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Related Question
Synchronous Motors
When the synchronous motor runs at synchronous speed, the voltage induced in the damper winding is _____
Zero
Maximum
None of the listed here
minimum
Zero
Maximum
None of the listed here
minimum
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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Synchronous Motors
The mechanical power developed by a synchronous motor is independent of _________.
Torque angle
Applied stator voltage
Speed
Field excitation
Torque angle
Applied stator voltage
Speed
Field excitation
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
Coincident with statorbpoles
45° (electrical) behind stator poles
Mid way between N and S poles of stator
None of the listed here
Coincident with statorbpoles
45° (electrical) behind stator poles
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 interchanging any two phases
By changing the applied voltage
By changing the supply frequency
By changing the load
By interchanging any two phases
By changing the applied voltage
By changing the supply frequency
By changing the load
Answer
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