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Electrical Machines

Electrical Machines
Which of the following is not a part of transformer?

 Tap changer.
 Radiator.
 Conservator tank.
  Commutator.

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Electrical Machines
Hunting in a synchronous cannot be due to

  variable frequency.
  windage friction.
  variable supply voltage.
  variable load.

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Electrical Machines
A slip ring Induction motor runs at 290 rpm at full load, when connected to 50 Hz supply. Determine the number of poles and slip.

  P = 20, s = 3.33 %.
  P = 50, s = 4.43 %.
  P = 40, s = 5.79 %.
  P = 60, s = 0.96 %.

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Electrical Machines
The short circuit test on a transformer is conducted to obtain

  copper losses.
 core loses only.
 eddy current loss.
 hysteresis loss.

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Electrical Machines
In a DC generator sparking between brushes and commutator surface may be due to

  any of the above.
  too rapid reversal of current.
  under commutation.
 over commutation.

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Electrical Machines
A three phase induction motor has a synchronous speed of 1500 rpm the machine runs at 1460 rpm at a particular load. The slip at this load is ___________.

 5 %.
  2.67 %.
  30 %.
 1.5 %.

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