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Electrical Machines

Electrical Machines
In DC generator on no-load, the air gap flux distribution in space is

  pulsating.
  flat topped.
 triangular.
  sinusoidal.

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Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

  0.05.
 20.
  0.905.
 1.1.

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Electrical Machines
In DC generators, the residual magnetism is of the order of

  20 %.
  2.5 %.
 10 %.
  15 %.

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Electrical Machines
If the number of rotor slots is equal to number of stator slots, then motor refuses to start. Hence it is known as

  relative speed.
  cogging.
  air gap.
  crawling.

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Electrical Machines
The current drawn by the a 230 V DC motor of armature resistance 0.5 Ω and back emf 200 V is

 660
 60
 600
 40

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Electrical Machines
No load test of 3-phase induction motor gives which of the following?

 both A and B
 variable loss
None of these
 constant loss

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