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Electrical Machines

Electrical Machines
The armature resistance of the dc motor is generally of the range

  0.5 ohm.
 100 ohm.
 50 ohm.
  0.1 ohm.

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Electrical Machines
Winding conductors of an electrical power transformer are mainly insulated by

  paper insulation.
 rubber insulation.
 cotton insulation.
 wooden insulation.

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Electrical Machines
If Ke is eddy current constant, Kf is form factor, f is supply frequency, Bm maximum flux density in core of transformer, the expression of eddy current loss in transformer, is given by

 KefKf2Bm2.
  Kef2Kf2Bm2.
 Kef2Kf2Bm.
 Kef2KfBm2.

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Electrical Machines
The magnetic field which initially induces emf in the armature in a self excited DC generator is because of

 armature reaction.
None of these
  residual magnetism.
  permanent magnets.

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Electrical Machines
Which single phase motor is used for a refrigerator?

  Capacitor run.
  Repulsion.
  Universal.
  Split phase.

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Electrical Machines
Unbalanced supply voltage given to a 3 - φ, delta connected induction motor will cause

  negative sequence current.
  less heating of the rotor.
  less heating of the rotor.
  all of these.

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