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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.
 2 to 3.
  1.5 to 2.

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Electrical Machines
Ratio of starting torque to full load torque is minimum in

  Cumulative compound motor.
  Differential compound motor.
  Series motor.
  Shunt motor.

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Electrical Machines
The armature shaft must be able to with stand

 Twisting stains due to transmission of torque.
 Bending moment due to weight of the armature.
 Any unbalanced magnetic pull on the armature core.
All of these

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Electrical Machines
In most condition which frame of motor will be preferred?

 Splash proof.
 Open type.
 Drip proof.
  Totally enclosed fan coiled.

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Electrical Machines
Maximum allowable acidity level of power transformer insulating oil is generally taken as

 2 mg of KOH / gm.
  1 mg of KOH / gm.
  0.3 mg of KOH / gm.
 0.5 mg of KOH / gm.

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Electrical Machines
Maximum efficiency will occur, when copper loss is_______to iron loss?

 greater than
 equal to
 less than
 any of the above

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MORE MCQ ON Electrical Machines

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