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Electrical Machines

Electrical Machines
In a transformer zero voltage regulation is achieved at a load power factor which is

 leading
 zero
 unity
 lagging

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Electrical Machines
The inertia constant H of a synchronous condenser is

 greater than that of turbo alternator.
  none of these.
 equal to that of the effective length of the line.
 greater than that of hydro generator.

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Electrical Machines
Voltage regulation of transformer is given by

 (V2 - E2) / E2
 (V2 - E2) / V2
 (E2 - V2) / E2
 (E2 - V2) / V2

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Electrical Machines
Which of following motor is preferred for belt conveyor?

  Reluctance motor.
  Synchronous motors.
  Slip ring induction motor.
  Universal motor.

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Electrical Machines
Why are capacitors used with large AC induction motor?

  Improve current level.
  Improve power level.
  Improve power factor.
  Improve voltage level.

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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?

 18.25%.
 14.28%.
  16.67%.
 15.30%.

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