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Electrical Machines

Electrical Machines
A generator may loose residual magnetism due to

  over excitation.
  vibrations.
  heating.
  any of these.

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Electrical Machines
In a 6 pole DC machine, 90 mechanical degrees correspond to which of the following electrical degree?

 30.
 45.
 180.
  270.

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Electrical Machines
The working principle of transformer depends on

 Coulombs law.
 Newtons law.
 Amperes law.
 Faradays law of electromagnetic induction.

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Electrical Machines
In DC generators, the cause of rapid brush wear may be

 imperfect contact.
 rough commutator surface.
 severe sparking.
 any of above.

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Electrical Machines
Which of the following rotor requires damper winding?

 Salient pole rotor.
None of these
 Both type rotor.
 Cylindrical rotor.

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Electrical Machines
Which motor used in Lathe machine?

None of these
  D.C . series motor.
  D.C. cumulative compound motor.
  D.C. shunt motor.

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MORE MCQ ON Electrical Machines

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