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Electrical Machines

Electrical Machines
Maximum allowable moisture content of power transformer insulating oil is generally taken as

 45 ppm.
  35 ppm.
 20 ppm.
 25 ppm.

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Electrical Machines
The type of DC motor used for shears and punches is

 Differential compound motor.
 Series motor.
 Shunt motor.
  Cummulative compound motor.

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Electrical Machines
We can apply source transformation to voltage source when a resistance is connected to it in

  13 HP.
 14 HP.
  10 HP.
 15 HP.

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Electrical Machines
Which one of the following statement is correct ? In an induction motor if the air gap is increased then

 its speed will increase
 its speed will reduce
 its power factor will reduce
 its efficiency will improve

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Electrical Machines
Ward Leonard control provides speed control

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

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Electrical Machines
The total core loss of a 400 V, 50 Hz transformer is 2400W, when it is supplied by 200 V, 25 Hz loss is 800W. Calculate eddy current loss and hysteresis loss?

 1600W, 800W
 1000W , 1400W
 1400W, 1000W
 800W, 1600W

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