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Electrical Machines

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

  starting torque.
  electromagnetic torque.
  none.
  maximum torque.

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Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

 0.649.
  0.573.
 0.512.
 0.443.

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Electrical Machines
Lamination of core are generally made of

 stainless steel.
 cast iron.
 silicon steel.
 carbon.

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Electrical Machines
Which of following components of a DC generator plays vital role for providing direct electric current of a DC generator?

 Eye bolt.
 Equalizer rings.
 Dummy coils.
 Commutator.

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Electrical Machines
In DC generator, lap winding is used in

  high current and low voltage applications.
 high voltage and low current applications.
 where greater load is connected.
 where constant speed is required.

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Electrical Machines
If any two leads from slip rings are interchanged in a 3 - Φ induction motor, the motor will

  get damaged.
  not run.
  run in a direction opposite to previous one.
  continue running in the same direction as before.

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MORE MCQ ON Electrical Machines

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