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Synchronous Motors
The back emf in the stator of a synchronous motor depends on
Flux density
Rotor excitation
None of the listed here
Rotor speed
Flux density
Rotor excitation
None of the listed here
Rotor speed
Answer
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Related Question
Synchronous Motors
The standard full-load power factor ratings for synchronous motors are
unity or zero
zero or 0.8 leading
unity or 0.8 lagging
unity or 0.8 leading
unity or zero
zero or 0.8 leading
unity or 0.8 lagging
unity or 0.8 leading
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 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
the back e.m.f. will be more than the supply voltage
the stator current will be zero
Answer
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Synchronous Motors
The construction of a synchronous motor resembles
an alternator
an induction motor
a rotary converter
a series motor
an alternator
an induction motor
a rotary converter
a series motor
Answer
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Synchronous Motors
The pull out torque of a synchronous motor is generally ______ times its full-load torque.
6 to 9
5 to 10
0.5
1.25 to 3.5
6 to 9
5 to 10
0.5
1.25 to 3.5
Answer
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Synchronous Motors
The pull out torque of a synchronous motor will ______ as the field excitation is increased.
Remain unchanged
Decrease
Increase
None of the listed here
Remain unchanged
Decrease
Increase
None of the listed here
Answer
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