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Electrical Machines

Electrical Machines
Hysteresis loop represents the area of

 copper loss
 eddy current loss
 total iron losses
 hysteresis loss

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Electrical Machines
Which of the following induction motor has maximum speed?

 6 pole.
 4 pole.
 8 pole.
  2 pole.

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Electrical Machines
The size of inter poles is small as compared to main poles. What is the reason?

 In order to get saturated.
All of these
 In order to get more flux.
 In order to not to get saturated.

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Electrical Machines
A load of 900 lbs is to be raised with a lift car weighting 855 lbs at a speed of 110 feet per minute, the over balance being 40 % and percentage efficiency 45 %. Find the horse power of the motor without counterweight

  150.
 160.
 170.
 180.

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Electrical Machines
A three phase 400 V, 6 pole, 50 Hz, squirrel cage induction motor is running at a slip of 5%. The speed of stator magnetic field with respect to rotor magnetic field and speed of rotor w.r.t stator magnetic field are

 zero, 950 rpm.
 zero , - 50 rpm.
 1000 rpm, - 50 rpm.
 1000 rpm, 950 rpm.

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Electrical Machines
What does happen if tripled harmonics given to induction motor?

  Will results in open circuit.
  Nothing will happen.
  Will results in short circuit.
  Fail to start.

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MORE MCQ ON Electrical Machines

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