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Electrical Machines

Electrical Machines
Pole changing methods are suitable only for ___________ type induction motor.

  cage.
  linear.
  wound.
  none of these.

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Electrical Machines
What is/are the necessary conditions for parallel operation of alternators?

 Frequency should be same
 Speed of alternators should be same
 Terminal voltage is same
 Both 1and 2

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Electrical Machines
Capacitor in split phase induction motor is used to

 reduce the harmonics.
 improve the power factor.
 improve the starting torque.
 start the motor.

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

 1 - s.
  2 - s.
 2 + s.
  s.

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Electrical Machines
What is the reason for stationary armature essential in alternators above 5 KVA?

All of these
 Collecting of large current is simple.
 Insulation requirement is less.
 Operating cost is less.

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Electrical Machines
For 250 volt DC Shunt Motor the armature and field resistance are 0.5 ohm and 250 ohm respectively. What will be the back e.m.f. produced when it takes a load current of 21A.

 240 V.
 280 V.
 150 V.
 220 V.

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