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Electrical Machines

Electrical Machines
Induction motors have the advantage of

  all of below.
  simple in construction.
  less cost.
  less maintenance.

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Electrical Machines
Field divertor method of speed control of a DC series motor gives speed above rated one due to reduction of

 None of above.
 Field current.
 Line current.
 Armature current.

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Electrical Machines
In a Dc generator the magnetic neutral axis coincide with geometrical neutral axis, when

  the generator runs on designed speed.
  the generator runs on overload.
  there is no load on the generator.
  the generator runs on full load.

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Electrical Machines
R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is

 K×R1
 R1 /K
 K²R1
 R1 /K²

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Electrical Machines
Dynamic braking can be used for

All of these
 series motors.
 compound motors.
 shunt motors.

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

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

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MORE MCQ ON Electrical Machines

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