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Electrical Machines

Electrical Machines
The material used for commutator brushes is mostly

 cast iron.
 copper.
 mica.
  carbon.

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Electrical Machines
Which of the following rotor requires damper winding?

 Salient pole rotor.
 Both type rotor.
None of these
 Cylindrical rotor.

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Electrical Machines
Which of the following is/are not a self starting motor?

 both 1 and 2
None of these
 3-phase induction motor
 1-phase induction motor

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Electrical Machines
When a transformer is loaded, the secondary terminal voltage drops. That means power factor is

 zero.
 leading.
 unity.
  lagging.

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Electrical Machines
The slight curvature at the lower end of the OCC of a self excited DC generator is due to

  high speed.
  magnetic inertia.
  residual flux.
  high field resistance.

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Electrical Machines
The air gap between stator and the rotor of the 3 - φ induction motor is kept

  depends on the material of stator and the rotor.
  air gap does not matter.
  as wide as possible.
  as small as possible.

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MORE MCQ ON Electrical Machines

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