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Electrical Machines

Electrical Machines
In single phase rotary converter the number of slip rings will be

 three.
 two.
 six.
 four.

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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
The no load current in a transformer lags the applied voltage by

  about 75°.
 90°.
 about 115°.
 0°.

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Electrical Machines
The reduced air gap results in an increase

  power factor.
  cost of operation.
  starting torque.
  breaking torque.

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Electrical Machines
_____________ types of induction motor are widely used.

  Three phase IM.
  Slip ring IM.
  Squirrel cage IM.
  Single phase IM.

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Electrical Machines
In which of the following, voltage regulation may be zero or negative

All of these
 lagging power factor
 unity power factor
 leading power factor

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