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Electrical Machines

Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 1/(1-S)
 S
 1-S
 1/S

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Electrical Machines
An IM cannot run at synchronous speed because

  rotor torque will not be produced.
  none of above.
  air friction will prevent it.
  induction motor will become synchronous motor.

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Electrical Machines
For higher values of armature, the speed of a DC series motor is

  Constant.
 Inversely proportional to armature current.
 Proportional to armature current.
 Proportional to the square of armature current.

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Electrical Machines
Transformer core is laminated to reduce

 both 1 and 2.
 copper loss.
 eddy current loss.
 hysteresis loss.

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Electrical Machines
The wattage rating of a ceiling fan motor will be

 10 - 20 W.
 250 - 500 W.
  50 - 150 W.
 200 - 250 W.

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

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

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