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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
run with excessive vibrations
take less than the rated load
not start
run at 2/3 of synchronous speed
run with excessive vibrations
take less than the rated load
not start
Answer
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Related Question
Synchronous Motors
A synchronous motor connected to infinite bus-bars has at constant full load, 100% excitation and unity power factor. On changing the excitation only, the armature current will have
no change of power factor
leading power factor with over-excitation
lagging power factor with over-excitation
leading power factor with under-excitation
no change of power factor
leading power factor with over-excitation
lagging power factor with over-excitation
leading power factor with under-excitation
Answer
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Synchronous Motors
If the synchronous motor, properly synchronised to the supply is running on no load and is having negligible loss then
the back e.m.f. will be more than the supply voltage
the stator current will be zero
the stator current will be very high
the stator current will be very small
the back e.m.f. will be more than the supply voltage
the stator current will be zero
the stator current will be very high
the stator current will be very small
Answer
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Synchronous Motors
The power factor correction capability of a loaded synchronous motor _____ with the increases in mechanical load.
Remains unchanged
None of the listed here
Increases
Decreases
Remains unchanged
None of the listed here
Increases
Decreases
Answer
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Synchronous Motors
An over excited synchronous motor behaves as _____
An inductor
A resistor
None of the listed here
A capacitor
An inductor
A resistor
None of the listed here
A capacitor
Answer
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Synchronous Motors
The efficiency of a properly designed synchronous motor will usually fall in range
75 to 80%
99 to 99.5%
85 to 95%
60 to 70%
75 to 80%
99 to 99.5%
85 to 95%
60 to 70%
Answer
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