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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

 1.0.
 3 to 5.
  1.5 to 2.
 2 to 3.

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Electrical Machines
A single-phase transformer has its maximum efficiency at 60 percent of full load. At full load copper loss will be

 less than core loss.
 equal to core loss.
  more than core loss.
 zero.

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Electrical Machines
What type of connection is made in between the inter-pole and the field winding?

 None of the options.
 Parallel.
 Compound.
  Series.

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Electrical Machines
If the excitation of the synchronous generator fails, it acts as a/an

 synchronous motor.
 induction motor.
 synchronous generator.
  induction generator.

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

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

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Electrical Machines
Universal motor have which of the following application?

  Food mixer.
  Traction.
  Domestic pump.
  Lift.

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