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Electrical Machines

Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

 either GNA or MNA
None of these
 GNA
 MNA

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Electrical Machines
The slot edges in a DC machine are made of

 Mild steel.
 Silicon steel.
 Cast iron.
  Fibre.

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Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 V²
 V
 f
 f²

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Electrical Machines
Inter pole winding is connected in-------------------------- ?

 parallel with armature
 series with armature
 series with main poles
 parallel with main poles

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Electrical Machines
If the excitation of the synchronous generator fails, it acts as a/an

 induction motor.
 synchronous generator.
  induction generator.
 synchronous motor.

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Electrical Machines
Oil is provided in an oil filled transformer for

 cooling.
 lubrication.
  both cooling and insulation.
  insulating.

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