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Synchronous Motors
When load on a synchronous motor is increased, its armature current is increased provided, it is ______
Under-excited
All of these
Over-excited
Normally excited
Under-excited
All of these
Over-excited
Normally excited
Answer
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Related Question
Synchronous Motors
In a synchronous motor, the magnitude of stator back emf depends on _____
Speed of the rotor
Dc excitation only
Both the speed and rotor flux
Load on the motor
Speed of the rotor
Dc excitation only
Both the speed and rotor flux
Load on the motor
Answer
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Synchronous Motors
The ratio of starting torque to running torque in a synchronous motor is
One
Infinity
Zero
Two
One
Infinity
Zero
Two
Answer
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Synchronous Motors
In a synchronous motor, the forced vibrations will be maximum when driving
A reciprocating air compressor
A centrifugal blower
A centrifugal pump
Any of the listed here
A reciprocating air compressor
A centrifugal blower
A centrifugal pump
Any of the listed here
Answer
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Synchronous Motors
The operating speed of a synchronous motor can be changed to new fixed value by
changing the supply voltage
changing frequency
using brakes
changing the load
changing the supply voltage
changing frequency
using brakes
changing the load
Answer
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Synchronous Motors
A synchronous motor can develop synchronous torque
below or above synchronous speed
while over-excited
when under loaded
only at synchronous speed
below or above synchronous speed
while over-excited
when under loaded
only at synchronous speed
Answer
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