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Electrical Machines

Electrical Machines
The material used for commutator brushes is mostly

  carbon.
 cast iron.
 copper.
 mica.

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Electrical Machines
In DC generators, the residual magnetism is of the order of

 10 %.
  20 %.
  15 %.
  2.5 %.

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Electrical Machines
A transformer core is made up of a silicon steel laminations which has maximum flux density 1 Tesla. If it was cold rolled grain oriented its flux density increases to 1.6 Tesla. What is the saving in core size or area due to cold rolled grain oriented process?

 60%
 40%
 38%
 68%

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Electrical Machines
The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

  16.67 Hz.
  25 Hz.
  60 Hz.
  50 Hz.

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

None of these
 GNA
 either GNA or MNA
 MNA

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Electrical Machines
Which of the following induction motor has the highest starting torque?

 Same in both induction motors.
 Squirrel cage induction motor.
 Slip ring induction motor.
None of these

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