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Electrical Machines

Electrical Machines
Armature reaction in dc motor results

  decrease in speed.
  short circuit.
  open circuit.
  increase in speed.

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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
A 220 V dc machine has an armature resistance of 1Ω.If the full-load current is 20 A, the differenc in the induced voltages when the machine is running as a motor and as a generator is

 20 V
 50 V
 zero
 40 V

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Electrical Machines
The slip of an induction motor during DC rheostatic braking is

  2 - s.
  s.
 1 - s.
 2 + s.

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Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

  0.54.
 0.3.
  1.
 0.7.

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Electrical Machines
A load of 900 lbs is to be raised with a lift car weighting 855 lbs at a speed of 110 feet per minute, the over balance being 40 % and percentage efficiency 45 %. Find the horse power of the motor without counterweight

  150.
 160.
 170.
 180.

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