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Electrical Machines
A 440 V, 3-phase, 10 pole and 50 HZ synchronous motor delivering a torque of 50 N-m, delivers a power of
3000W
100W
1000W
500W
3000W
100W
1000W
500W
Answer
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Related Question
Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM is running at a full load speed of 980 rpm. If it delivers an air gap power of 98000 Watt, calculate the rotor ohmic loss?
1920 Watt.
1960 Watt.
980 Watt.
1800 Watt.
1920 Watt.
1960 Watt.
980 Watt.
1800 Watt.
Answer
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Electrical Machines
When an electric train is moving down a hill, the DC motor will operate as
DC series generator.
DC shunt generator.
DC shunt motor.
DC series motor.
DC series generator.
DC shunt generator.
DC shunt motor.
DC series motor.
Answer
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Electrical Machines
If field current is decreased in shunt dc motor, the speed of the motor
decreases.
None of these
increases.
remains same.
decreases.
None of these
increases.
remains same.
Answer
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Electrical Machines
In a three phase star - delta transformer, what is the angle difference between primary and secondary phase voltages?
Delta side leads by 30°.
Delta side lags by -30°.
Star side lags by -30°.
Star side leads by 30°.
Delta side leads by 30°.
Delta side lags by -30°.
Star side lags by -30°.
Star side leads by 30°.
Answer
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Electrical Machines
No load primary current in a transformer
leads the applied voltage by exactly 90Â&
leads the applied voltage somewhat less than 90Ã&
lags behind applied voltage somewhat less than 90Ã
lags behind applied voltage by exactly 90Â&am
leads the applied voltage by exactly 90Â&
leads the applied voltage somewhat less than 90Ã&
lags behind applied voltage somewhat less than 90Ã
lags behind applied voltage by exactly 90Â&am
Answer
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