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Electrical Machines

Electrical Machines
If the air gap of IM is increased, ____________ will increase.

  magnetizing current.
  air gap flux.
  power factor.
  speed.

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Electrical Machines
Variation in speed by ward-Leonard control of DC motors occurs due to variation in

  Supply voltage.
  Armature current.
  Field excitaion.
  Armature voltage.

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Electrical Machines
What is power factor of a 3 - φ induction motor at no load?

  Equal to 1.
  Same as full load.
  Low.
  High.

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Electrical Machines
The power input to a 3 - φ induction motor is 60 kW and stator loss is 1 kW the rotor cu loss per phase is

  slip X 69 / 3.
  slip X 50 / 3.
 1.
  slip X 59 / 3.

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Electrical Machines
For high current and low voltage rating which winding is employed to DC machine?

 Wave winding.
 Both wave and lap winding.
 No wave and lap winding.
 Lap winding.

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Electrical Machines
The ventilating ducts in most of DC machine are

 none of these.
 radial as well as longitudinal.
 radial.
 longitudinal.

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