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Electrical Machines

Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

 1.1.
  0.905.
 20.
  0.05.

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Electrical Machines
_____________ types of induction motor are widely used.

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

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Electrical Machines
Field winding of a DC series motor is usually provided with thick wire

 to reduce the insulation of materials.
 to provide large flux.
 as it carries large load current.
 in order to reduce eddy current to provide large flux.

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Electrical Machines
In induction motor especially the cage rotors slots are nearly parallel to shaft axis. This is called

  slip.
  crawling.
  skewing.
  cogging.

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Electrical Machines
Dynamic braking is employed to brake

 reversing drive
 both 1 and 2
 non reversing drive
None of these

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Electrical Machines
Which of following winding is connected in series with armature winding of DC machine?

 Compensating winding.
 Both Compensating and Commutating pole winding.
 Auxiliary winding.
 Commutating pole winding.

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