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Electrical Machines

Electrical Machines
Hysteresis loss is proportional to

 f3.
  f.
 f2.
 f1.5.

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Electrical Machines
DC machine windings are

 full pitched
 either of these
 short pitched
None of these

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Electrical Machines
A large series motor is never started without some mechanical on it because otherwise it will

  Develop excessive speed and damage itself.
 Produce sparking at brushes.
 Open fuse or circuit breaker.
 Draw too much current.

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Electrical Machines
In dc motors, under leading pole tips flux density will--------?

 either increase or decrease
 decrease
None of these
 increase

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Electrical Machines
In a DC generator in case the brushes are moved so as to bring them in magnetic neutral axis, then, there will be

  cross-magnetisation.
  cross-magnetization as well as demagnetization.
 demagnetisation.
  none of above.

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Electrical Machines
Two DC series motors are connected in series and are driving the same mechanical load. If the motors are now connected in parallel the speed will become

 double.
 one fourth.
 4 times.
 half.

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MORE MCQ ON Electrical Machines

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