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Synchronous Motors
Leading power factor synchronous motors cost ______ the unity pf motors.
About the same as
Less than
More than
None of the listed here
About the same as
Less than
More than
None of the listed here
Answer
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Related Question
Synchronous Motors
While running, a synchronous motor is compelled to run at synchronous speed because of _______
Magnetic locking between stator and rotor poles
Induced emf in rotor field winding by stator flux
Damper winding in its pole faces
Compulsion due to lenz's law
Magnetic locking between stator and rotor poles
Induced emf in rotor field winding by stator flux
Damper winding in its pole faces
Compulsion due to lenz's law
Answer
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Synchronous Motors
A synchronous motor is a ______ motor.
Variable speed
Variable pf
Singly fed
None of the listed here
Variable speed
Variable pf
Singly fed
None of the listed here
Answer
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Synchronous Motors
A synchronous motor develop maximum power when load angle is
45°
120°
60°
90°
45°
120°
60°
90°
Answer
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Synchronous Motors
If the field of a synchronous motor is underexcited, the power factor will be
lagging
leading
zero
unity
lagging
leading
zero
unity
Answer
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Synchronous Motors
When load on an over-excited or under excited synchronous motor is increased, rate of change of its armature current as compared with that of power factor is
twice
less
more
equal
twice
less
more
equal
Answer
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