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Electrical Machines

Electrical Machines
The output power of any electrical motor is taken from the

 Coupling mounted on the shaft.
 Armature.
 Motor frame.
 Field.

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Electrical Machines
What is the necessity of copper brushes in a dc motors?

  To absorb the mechanical shocks produced during running condition.
  To convert alternating supply current to direct current.
  None of these.
  To increase the flux cutting by the rotor.

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Electrical Machines
In DC series motor the speed is ______________ proportional to the armature current.

 none of these.
 inversely.
 has no relation.
 directly.

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Electrical Machines
The armature of DC motor is laminated

 to reduce the inductor.
 to reduce the eddy current loss.
 to reduce the hysteresis loss.
 to reduce the mass.

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Electrical Machines
Iron loss in a transformer mainly occurs in

 transformer insulating oil.
 iron made tank of transformer.
 steel core in transformer.
 winding of transformer.

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Electrical Machines
For pure resistive load what is the armature reaction?

All of these
 cross magnetization
 magnetization
 demagnetization

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