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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

 460 V
 200 V
 115 V
 230 V

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Electrical Machines
The direction of rotation of a DC compound motor can be reversed by interchanging

 series field connections.
 armature or field connections.
 shunt field connections.
 armature connections.

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Electrical Machines
To get the speed of DC motor is more than normal without wastage of electrical energy _____________ is used.

  None of above.
  Rheostatic control.
  Any of above method.
  Ward Leonard control.

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Electrical Machines
For standing a DC motor a starter is required because

  it limits the starting current to a safe value.
  It starts the motor.
None of these
  it limits the speed of the motor.

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Electrical Machines
A single phase transformer when supplied from 220 V, 50 Hz has eddy current loss of 50 W. If the transformer is connected voltage of 330 V, 75 Hz, the eddy current loss will be

 75 W
 112.5 W
 168.75 W
 50 W

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Electrical Machines
The three point starter is used for

  Shunt motor as well as compound motors.
  Shunt, compound and series motor.
  Shunt motor.
  Series motor.

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