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Electrical Machines

Electrical Machines
The material used for commutator brushes is mostly

 cast iron.
  carbon.
 copper.
 mica.

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Electrical Machines
Transformer cooling and insulating oil must be of

 low BDV.
  low viscosity.
 low resistivity.
 high viscosity.

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Electrical Machines
In an auto-transformer, power is transferred through

 both A and B.
None of these
 conduction process only.
 induction process only.

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Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  1.0.
  0.1.
  0.5.
  0.05.

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Electrical Machines
Commonly used starters of cage motor is

  both A and B.
  star delta.
None of these
  DOL.

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Electrical Machines
Tertiary winding in a transformer is mostly

 zig - zag star connected.
  delta connected.
 zig - zag delta connected.
 star connected.

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MORE MCQ ON Electrical Machines

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