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Electrical Machines

Electrical Machines
Iron losses in a DC machine are independent of variation in

 speed.
  voltage.
  speed and voltage.
  load.

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Electrical Machines
The synchronous speed of an induction motor will be increased by

  speed can not be increased.
  increasing of frequency.
  increasing number of poles.
  decreasing of frequency.

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Electrical Machines
On switching a DC motor to DC supply mains, it is found to rotate in the direction opposite to that for which it is designed. The DC motor is

 Cummulative compound.
  Differentical compound.
 Series shunt.
 have an equal number of electrons and protons.

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Electrical Machines
In DC machine shape of main field flux distribution is?

 triangular
 peaky in nature
 flat tapped or trapezoidal
 saddle shape

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Electrical Machines
Stray losses in transformer occurs in

 paper insulation in transformers.
 steel core.
 transformer insulating oil.
  winding conductors and steel structures of transformer.

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Electrical Machines
For P pole machine relation between electrical degrees and mechanical degrees is

 θelec = 2/P*θmech
 θelec = θmech
 θelec = P/2*θmech
 θelec = 4/P*θmech

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MORE MCQ ON Electrical Machines

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