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Electrical Machines

Electrical Machines
A 3-phase, 50Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor output power?

 1450W
 1920W
 1820W
 2000W

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Electrical Machines
Total core loss is also called as -------------?

 Hysteresis loss
 Copper loss
 Magnetic loss
 Eddy current loss

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Electrical Machines
In travelling cranes for hoisting and lowering which type of motor is preferred?

  Synchronous motor.
  Single phase induction motor.
  AC slip ring motor.
  DC series motor.

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Electrical Machines
Series booster is a

 permanent magnet DC generator.
 shunt wound DC generator.
  series wound DC generator.
 separately excited DC generator.

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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.
 180.
 160.
 170.

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Electrical Machines
Skewing of cage rotors offers the following advantages

  locking tendency is reduced.
  uniform torque.
  less noise.
  all of below.

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