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Synchronous Motors
A synchronous motor can be used as a synchronous capacitor when it is
Over excited
Over loaded
Under excited
Under loaded
Over excited
Over loaded
Under excited
Under loaded
Answer
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Related Question
Synchronous Motors
The standard full-load power factor ratings for synchronous motors are
unity or 0.8 leading
unity or 0.8 lagging
zero or 0.8 leading
unity or zero
unity or 0.8 leading
unity or 0.8 lagging
zero or 0.8 leading
unity or zero
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 stator current will be very small
the stator current will be very high
the stator current will be zero
the back e.m.f. will be more than the supply voltage
the stator current will be very small
the stator current will be very high
the stator current will be zero
the back e.m.f. will be more than the supply voltage
Answer
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Synchronous Motors
The rotor of a synchronous motor is
Identical to that of a dc motor
Salient pole type
Nonsalient pole type
None of the listed here
Identical to that of a dc motor
Salient pole type
Nonsalient pole type
None of the listed here
Answer
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Synchronous Motors
A synchronous motor can develop synchronous torque
below or above synchronous speed
only at synchronous speed
while over-excited
when under loaded
below or above synchronous speed
only at synchronous speed
while over-excited
when under loaded
Answer
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Synchronous Motors
A synchronous motor will always stop when
Load in motor varies
Supply voltage frequency changes
Excitation winding gets disconnected
Supply voltage fluctuates
Load in motor varies
Supply voltage frequency changes
Excitation winding gets disconnected
Supply voltage fluctuates
Answer
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