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Electrical Machines

Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as

 3 to 5.
  1.5 to 2.
 1.0.
 2 to 3.

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Electrical Machines
In salient pole synchronous machine, the reluctance power varies as

 cosδ
 sinδ
 sin2δ
 cos2δ

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Electrical Machines
The interpoles in dc machines have a tapering shape in order to

 reduce the saturation in the interpole
 reduce the overall weight
 increase the acceleration of commutation
 economise on the material required for interpoles and their windings

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Electrical Machines
Which 1 - Φ motor does operate at high power factor?

  Shaded pole.
  Split phase.
  Capacitor start.
  Capacitor run.

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Electrical Machines
The slip of an induction motor during DC rheostatic braking is

 1 - s.
  s.
  2 - s.
 2 + s.

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

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

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