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Electrical Machines

Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5Ω and back back emf 200 V is

 44 A.
  40 A.
 400 A.
 440 A.

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Electrical Machines
In DC generators brushes are used for

 collecting of voltage
 convert ac armature current in to dc
 reduce eddy current loss
 collecting of current without any sparkings

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Electrical Machines
When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop

  induction motor torque.
  induction generator torque.
  DC motor torque.
  synchronous motor torque.

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Electrical Machines
Which single phase motor is used for a refrigerator?

  Repulsion.
  Split phase.
  Capacitor run.
  Universal.

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Electrical Machines
Exciting current of an induction motor is

  higher than power transformer.
  equal as power transformer.
  none of these.
  lesser than power transformer.

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Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 1 V
 0 V
 4 V
 2 V

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