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Electrical Machines

Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

 1.1.
  0.905.
 20.
  0.05.

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Electrical Machines
What is the function of inter pole in DC generator?

 To serve the economical aspects.
  Both option B and C.
 To get a superior commutation.
 To neutralize the distortion of main field flux due to armature reaction.

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Electrical Machines
When operating, two or more transformers in parallel, % impedance of these transformers should be

 inversely proportional to MVA rating of transformers.
  same.
 such that actual impedance of all transformers would be same.
 proportionate to MVA rating of transformers.

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Electrical Machines
A 3- phase synchronous motor can operate over a wide range of power factors i.e. from lagging to leading power factor. This is achieved by

 changing the load.
 varying the speed.
 changing the field excitation.
 varying the applied voltage.

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Electrical Machines
Which of the following voltage regulator is preferred for providing large values of load current?

  Zener diode shunt regulator.
  Transistor shunt regulator.
  Transistor series regulator.
None of these

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Electrical Machines
During no load test, an induction motor draws power

  only for the small copper loss.
  for core loss and copper loss.
  for core loss and windage and friction loss.
  for copper loss and windage friction loss.

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