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Electrical Machines

Electrical Machines
Swinburne test is conducted under which of the following condition?

 half load
 any of the above
 no load
 full load

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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

 60
 40
 660
 600

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Electrical Machines
The reduced air gap results in an increase

  starting torque.
  cost of operation.
  breaking torque.
  power factor.

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Electrical Machines
Compensating windings is placed in which part of a D.C motor?

  On yoke in the pole faces.
None of these
 On yoke in the inter pole gap.
 On armature.

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

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Electrical Machines
Silicon content in steel lamination is kept within 5% as it

 Increases cost.
All of these
 makes the material brittle.
 increases hysteresis loss.

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MORE MCQ ON Electrical Machines

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