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Electrical Machines

Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 400 A.
 44 A.
 40 A.
 440 A.

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Electrical Machines
Ward Leonard control provides speed control

 in one direction only.
 in both direction.
 above rated speed.
 below rated speed.

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

None of these
 constant loss
 both A and B
 variable loss

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Electrical Machines
Direct axis reactance is defined as the ratio of

 Vmax to Imax
 Vmin to Imin
 Vmax to Imin
 Vmin to Imax

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Electrical Machines
In a 3 - Φ IM in order to eliminate cogging the number of stator slots must be

  an integral multiple of number of rotor slots.
  equal to number of rotor slots.
  unequal to number of rotor slots and skewed in shape.
  either (B) or (C).

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Electrical Machines
Commutator in DC generator is used for

 collecting of current
 reduce losses
 increase efficiency
 convert AC armature current in to DC

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