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Electrical Machines

Electrical Machines
Slip rings of an induction motors are made of

  stainless steel.
  carbon.
  phosphor bronze.
  aluminium.

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Electrical Machines
At slip s = 1 torque developed in machine is

  none.
  electromagnetic torque.
  starting torque.
  maximum torque.

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Electrical Machines
In a DC generator, the ripples in the direct emf generated are reduced by employing

  carbon brushes.
  commutator with large number of segments.
 graphite brushes.
  equalizer rings.

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Electrical Machines
In a DC compound motor the field regulator is provided to

 limit the armature current.
 demagnetize the field partially.
 control the field flux.
 control the armature flux.

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Electrical Machines
The interpoles in dc machines have a tapering shape in order to

 reduce the overall weight
 increase the acceleration of commutation
 economise on the material required for interpoles and their windings
 reduce the saturation in the interpole

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Electrical Machines
The wattage rating of a ceiling fan motor will be

 250 - 500 W.
  50 - 150 W.
 200 - 250 W.
 10 - 20 W.

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MORE MCQ ON Electrical Machines

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