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Electrical Machines

Electrical Machines
The wattage rating of a ceiling fan motor will be

 10 - 20 W.
 250 - 500 W.
  50 - 150 W.
 200 - 250 W.

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Electrical Machines
A short circuit test on a transformer gives

  copper loss at any load.
 copper loss at half load.
 copper loss at over load.
 copper loss at full load.

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Electrical Machines
Maximum power developed depends on

 reactance
 load angle
 both 1and 2
 voltage

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Electrical Machines
A DC series motor has which of the following characteristics?

 Has a almost constant speed.
 Can be started easily without load.
 Has a poor torque.
 Has its field winding consinting of thick wire and less no of turns.

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Electrical Machines
The no load current in a transformer lags the applied voltage by

  about 75°.
 90°.
 0°.
 about 115°.

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Electrical Machines
Ward Leonard control is provides speed control

  Below rated speed.
  Above rated speed.
  In one direction only.
  In both direction.

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MORE MCQ ON Electrical Machines

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