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Electrical Machines

Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be

 500 rpm
 2000 rpm
 250 rpm
 1000 rpm

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Electrical Machines
The total core loss of a 400 V, 50 Hz transformer is 2400W, when it is supplied by 200 V, 25 Hz loss is 800W. Calculate eddy current loss and hysteresis loss?

 800W, 1600W
 1000W , 1400W
 1600W, 800W
 1400W, 1000W

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Electrical Machines
The rotor electromotive force of the IM is observed to make 100 complete alterations per minute, calculated slip

 0 .001 %.
  3.33 %.
None of these
 3 %.

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Electrical Machines
Generator works on the principle of production

 dynamically induced emf.
None of these
 static induced emf.
 both A and B.

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Electrical Machines
The synchronous speed of an induction motor will be increased by

  speed can not be increased.
  increasing number of poles.
  increasing of frequency.
  decreasing of frequency.

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Electrical Machines
In most condition which frame of motor will be preferred?

 Drip proof.
 Splash proof.
 Open type.
  Totally enclosed fan coiled.

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