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Electrical Machines

Electrical Machines
A DC generator beyond critical resistance will generate

 maximum voltage.
 maximum power.
 no voltage.
 maximum current.

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

 240 V
 234 V
 474 V
 6 V

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Electrical Machines
During no load test, an induction motor draws power

  for copper loss and windage friction loss.
  for core loss and windage and friction loss.
  only for the small copper loss.
  for core loss and copper loss.

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Electrical Machines
Iron loss in a transformer mainly occurs in

 transformer insulating oil.
 iron made tank of transformer.
 steel core in transformer.
 winding of transformer.

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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?

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

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Electrical Machines
Which of the following methods are used to control the speed of DC motors is

 armature circuit resistance control
 supply voltage control
All of these
 field current control

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