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Synchronous Motors
If one phase of a 3 phase synchronous motor is short circuited, motor
Will overheat in spots
Will not come upto speed
Will fail to pull into step
Will refused ro start
Will overheat in spots
Will not come upto speed
Will fail to pull into step
Will refused ro start
Answer
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Related Question
Synchronous Motors
A synchronous motor develops maximum power when load angle is
90°
120°
60°
45°
90°
120°
60°
45°
Answer
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Synchronous Motors
When load on a synchronous motor is increased, its armature current is increased provided, it is ______
Under-excited
Normally excited
Over-excited
All of these
Under-excited
Normally excited
Over-excited
All of these
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
using brakes
changing frequency
changing the load
changing the supply voltage
using brakes
changing frequency
changing the load
Answer
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Synchronous Motors
A synchronous motor can be used as a synchronous capacitor when it is
Under loaded
Over excited
Under excited
Over loaded
Under loaded
Over excited
Under excited
Over loaded
Answer
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Synchronous Motors
In a synchronous motor it the back e.m.f. generated in the armature at noload is approximately equal to the applied voltage, then
the motor is said to be fully loaded
the excitation is said to be hundred per cent
the excitation is said to be zero per cent
the torque generated is maximum
the motor is said to be fully loaded
the excitation is said to be hundred per cent
the excitation is said to be zero per cent
the torque generated is maximum
Answer
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