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Electrical Machines

Electrical Machines
The material used for commutator brushes is mostly

 mica.
  carbon.
 cast iron.
 copper.

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Electrical Machines
In case of a conductively compensated DC series motor, the compensating winding is provided

 In parallel with the field winding.
 In parallel with the armature winding.
  In series with the armature winding.
 As a separate unit.

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Electrical Machines
Essential conditions for two DC generators are connecting for parallel operation is/are

 rating of generators should be same.
 terminal voltage should be same.
 polarities should be same.
 both A and B.

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Electrical Machines
In a three phase star - delta transformer, what is the angle difference between primary and secondary phase voltages?

  Delta side lags by -30°.
 Star side lags by -30°.
 Star side leads by 30°.
 Delta side leads by 30°.

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Electrical Machines
In a 6 pole DC machine, 90 mechanical degrees correspond to which of the following electrical degree?

 45.
 180.
  270.
 30.

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Electrical Machines
A 220 V dc machine has an armature resistance of 1Ω.If the full-load current is 20 A, the differenc in the induced voltages when the machine is running as a motor and as a generator is

 20 V
 40 V
 50 V
 zero

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