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Synchronous Motors
If the field of a synchronous motor is underexcited, the power factor will be
unity
lagging
leading
zero
unity
lagging
leading
zero
Answer
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Related Question
Synchronous Motors
Hunting in a synchronous motor can not be due to
Variable supply frequency
Variable frequency
Windage friction
Variable load
Variable supply frequency
Variable frequency
Windage friction
Variable load
Answer
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Synchronous Motors
As the load is applied to a synchronous motor, the motor takes more armature current because
The back e.m.f. decreases causing an increase in motor current
The rotor by shifting its phase backward causes motor to take more current
The increased load has to take more current
The rotor strengthens the rotating field causing more motor current
The back e.m.f. decreases causing an increase in motor current
The rotor by shifting its phase backward causes motor to take more current
The increased load has to take more current
The rotor strengthens the rotating field causing more motor current
Answer
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Synchronous Motors
A synchronous machine with low value of short-circuit ratio has
good speed regulation
good voltage regulation
lower stability limit
high stability limit
good speed regulation
good voltage regulation
lower stability limit
high stability limit
Answer
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Synchronous Motors
The duration of sudden short circuit test on synchronous motor is usually about
One second
None of the listed here
One hour
One minute
One second
None of the listed here
One hour
One minute
Answer
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Synchronous Motors
The angle between the rotor poles and stator poles, in a synchronous motor, is known as
Angle of retardation
Synchronising angle
Torque angle
Power factor angle
Angle of retardation
Synchronising angle
Torque angle
Power factor angle
Answer
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