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Electrical Machines

Electrical Machines
The output power of a dc motor is given by

  EbIa2.
  none of these.
  EIa.
  EbIa.

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Electrical Machines
In electric locomotive which of the following motor are used ?

  Separately compound motor.
  Synchronous motor.
  Shunt motor.
  DC series motor.

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Electrical Machines
Slot wedges in a dc machine is made up of

 cast iron.
 fibre.
 silicon steel.
 mild steel.

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Electrical Machines
Value of specific electric loading of Induction motor is in the range of

  5000 - 45000 ampere conductor / metre.
 30000 - 100000 ampere conductor / metre.
  400 - 4000 ampere conductor / metre.
 40 - 400 ampere conductor / metre.

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Electrical Machines
Speed of DC motor can be controlled by varying

 all of these.
 applied voltage.
 resistance of armature culture.
 its flux oer pole.

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

 V2
 V
 f
 f2

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