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Electrical Machines

Electrical Machines
Hysteresis loss is proportional to

 f1.5.
 f2.
  f.
 f3.

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency?

 94%
 96%
 95%
 92%

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Electrical Machines
Which of the following is minimized by laminating the core of a transformer?

 Stray loss.
 Copper loss.
 Eddy current loss.
 Hysteresis loss.

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Electrical Machines
For a standard frequency the machine operates at a particular speed known as

 slip speed.
 normal speed.
 any of the above.
 synchronous speed.

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Electrical Machines
Series booster is a

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

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Electrical Machines
How can the synchronous speed of a 3 - Φ IM be varied?

  By varying number of poles.
  By varying supply voltage.
  By varying the supply frequency.
  Both (A) and (B).

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