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Electrical Machines

Electrical Machines
A 8 pole, 50 Hz single phase induction motor is running at 690 rpm. Its slip with respect to forward field is

 -1.92
 -0.08
 0.08
 1.92

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

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

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Electrical Machines
Star - delta method of starting of motor is not possible in case of

  high torque motor.
  low horse power motor.
  single phase induction motor.
  high speed motor.

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Electrical Machines
Ward Leonard control provides speed control

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

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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?

 14.28%.
 15.30%.
  16.67%.
 18.25%.

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Electrical Machines
If the flux of DC motor approaches zero, its speed will

 between zero and infinity.
 aprroach infinity.
 approach zero.
 remain unchanged.

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