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Synchronous Motors
In a synchronous motor, the rotor copper loss are met by ______
Dc source
Supply lines
Armature input
Motor input
Dc source
Supply lines
Armature input
Motor input
Answer
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Related Question
Synchronous Motors
The mechanical power developed by a synchronous motor is ______ stator voltage.
Invesely proportional to
Independent of
Directly proportional to
Directly proportional to square of
Invesely proportional to
Independent of
Directly proportional to
Directly proportional to square of
Answer
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Synchronous Motors
The duration of sudden short-circuit test on a synchronous motor is usually about
one hour
one minute
None of these
one second
one hour
one minute
None of these
one second
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 stator current will be zero
the back e.m.f. will be more than the supply voltage
the stator current will be very high
the stator current will be very small
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
Small synchronous motors are started by _______
Damper winding
Variable frequency source
None of the listed here
Pony motor
Damper winding
Variable frequency source
None of the listed here
Pony motor
Answer
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Synchronous Motors
A synchronous motor with large air gap has
A higher synchronizing power which makes the machine less sensitive to load variations
All of the listed here
A small value of inherent regulation
A higher value of stability limit
A higher synchronizing power which makes the machine less sensitive to load variations
All of the listed here
A small value of inherent regulation
A higher value of stability limit
Answer
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