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Synchronous Motors
Synchronous Motors
For power factor correction, synchronous motors operate at
no-load and under-excited fields
normal load with minimum excitation
no-load and greatly over-excited fields
normal load with zero excitation
no-load and under-excited fields
normal load with minimum excitation
no-load and greatly over-excited fields
normal load with zero excitation
Answer
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Synchronous Motors
The rotor copper losses, in a synchronous motor, are met by
motor input
c. source
armature input
supply lines
motor input
c. source
armature input
supply lines
Answer
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Synchronous Motors
In case one phase of a three-phase synchronous motor is short-circuited the motor will
run at 2/3 of synchronous speed
take less than the rated load
not start
run with excessive vibrations
run at 2/3 of synchronous speed
take less than the rated load
not start
run with excessive vibrations
Answer
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Synchronous Motors
An important advantage of a synchronous motor over wound round induction motor is that
None of these
its speed is independent of supply frequency
its speed may be controlled more easily
its power factor may be varied at will
None of these
its speed is independent of supply frequency
its speed may be controlled more easily
its power factor may be varied at will
Answer
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Synchronous Motors
The power factor of a synchronous motor is better than that of induction motor because
synchronous motor has large air gap
mechanical load on the motor can be adjusted
stator supply is relieved of responsibility of producing magnetic field
synchronous motor runs at synchronous speed
synchronous motor has large air gap
mechanical load on the motor can be adjusted
stator supply is relieved of responsibility of producing magnetic field
synchronous motor runs at synchronous speed
Answer
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