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Electrical Machines

Electrical Machines
The output power of a dc motor is given by

  none of these.
  EbIa2.
  EIa.
  EbIa.

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Electrical Machines
Generator works on the principle of production

 static induced emf.
None of these
 dynamically induced emf.
 both A and B.

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Electrical Machines
Thin laminations are used in a machine in order to reduce

 Hysteresis losses
 Copper losses
 Both 1 and 2
 Eddy current losses

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Electrical Machines
In DC generator, full form of MNA is what?

 Magnetic no-load axis.
 Magnetically no-load armature co-ordinate.
  Magnetic neutral axis.
 Magnetic neutral armature co-ordinate.

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Electrical Machines
The armature reaction mmf in a DC machines has a form of

 trapezoidal.
 sinusoidal.
 rectangular.
  triangular.

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Electrical Machines
At what power factor, the voltage regulation of a transformer can be zero ?

 Lagging power factor.
 Unity power factor.
 Zero power factor.
  Leading power factor.

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