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Electrical Machines

Electrical Machines
The no load current in a transformer lags the applied voltage by

 about 115°.
  about 75°.
 90°.
 0°.

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Electrical Machines
In a synchronous motor hunting can be reduced to minimum possible by

  providing damper winding in the rotor pole faces.
  using a flywheel.
  any of above methods.
  designing the motor for adequate synchronizing power.

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Electrical Machines
Tap changer is generally provided in

 earthing transformer.
  power transformer.
 voltage transformer.
 current transformer.

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Electrical Machines
The armature of DC machine is made of silicon steel lamination to

 reduce both eddy current and hysteresis loss.
 reduce hysteresis loss only.
 reduce eddy current loss only.
 increase the permeability.

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Electrical Machines
To have sparkless commutation, the armature reaction effect in a DC machine is neutralized by

 fixing the brush axis inline with the pole axis.
 increasing field excitation.
  compensating winding and commutating poles.
 shifting the brush axis from GNA to MNA.

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Electrical Machines
In an induction motor, air gap power is 10 Kw and mechanically developed power is 8 Kw. What are the rotor ohmic losses?

 2KW
 0.5Kw
 3KW
 1.5KW

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MORE MCQ ON Electrical Machines

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