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Electrical Machines

Electrical Machines
In a transformer zero voltage regulation is achieved at a load power factor which is

 zero
 leading
 unity
 lagging

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Electrical Machines
The material used for commutator brushes is mostly

 cast iron.
 copper.
  carbon.
 mica.

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Electrical Machines
If the excitation is increased, the power factor is

 lagging power factor
 unity power factor
 leading power factor
None of these

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Electrical Machines
For small value armature current Ia the torque developed by a DC series motor is proportional to

  Ia2.
  1/Ia.
  √Ia.
  Ia.

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Electrical Machines
Under operating conditions the rotor conductor should be _________________ in induction motor.

  semi closed or semi opened.
  always closed.
  always opened.
  none.

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Electrical Machines
Armature resistance control method is used for the _______ ?

 above rated speed
 both 1 and 2
None of these
 below rated speed

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MORE MCQ ON Electrical Machines

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