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Electrical Machines

Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 115 V
 200 V
 230 V
 460 V

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Electrical Machines
Sparkless commutation can be achieved by employing

 compensating winding.
  high resistance carbon brushes.
  inter poles.
  any one or more of the above methods.

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Electrical Machines
In a transformer the magnetic coupling between the primary and secondary winding can be increased by

 using transformer oil of better quality.
 using the magnetic core of low reluctance.
 using soft material for winding.
 increasing the number of turns.

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Electrical Machines
In induction motor wound rotor motor is mainly is used in application where

  low starting torque.
  high starting torque.
  less costly motor is not required.
 power factor is less.

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Electrical Machines
When an electric train is moving down a hill, the DC motor will operate as

 DC shunt generator.
  DC series generator.
  DC series motor.
 DC shunt motor.

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Electrical Machines
When maximum flux density is constant, the eddy current losses are proportional to

 V
 f2
 f
 V2

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MORE MCQ ON Electrical Machines

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