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Electrical Machines

Electrical Machines
When maximum flux density is constant, the eddy current losses are proportional to

 f
 V2
 f2
 V

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

 cross magnetization
All of these
 demagnetization
 magnetization

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Electrical Machines
In DC machine yoke offers

 produce working flux
 mechanical protection to the machine
 both A and B
 flux path completion

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Electrical Machines
In DC generator, which component plays the vital role to produce the direct current?

 Armature.
 Yoke.
  Commutator.
 Brush.

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Electrical Machines
The change in speed of a DC generator due to increased load is corrected by

  increasing input power of the prime mover.
  increasing terminal voltage.
 increasing armature cooling.
  increasing armature resistance.

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Electrical Machines
The armature core of the rotor bars of dc motors are laminated

  to reduce eddy current loss.
  to reduce hysteresis loss.
  to provide better flux linkage.
  to reduce mechanical losses.

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