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Electrical Machines

Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

  0.905.
 20.
 1.1.
  0.05.

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Electrical Machines
The wound rotor type IM is used for____________ speed operation.

  variable.
  minimum.
  maximum.
  constant.

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Electrical Machines
An electric motor with constant output power will have a torque speed characteristics in the form of a

 Circle about the origin.
 Straight line parallel to the speed axis.
 Straight line through the origin.
 Rectangular hyperbola

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Electrical Machines
The no load and full load speed of DC mototr are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor?

  16.67%.
 15.30%.
 14.28%.
 18.25%.

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Electrical Machines
The output indicate on the name plate of any motor is always the

  Output power at the shaft.
 Gross power.
 Power drawn in KW.
 Power drawn in KVA.

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Electrical Machines
As compared to DOL starting, a cage induction motor with star-delta starting shall have

 more starting time.
 reduced starting current.
 more starting torque.
 smoother acceleration.

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