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Electrical Machines

Electrical Machines
In DC generator on no-load, the air gap flux distribution in space is

  sinusoidal.
  flat topped.
  pulsating.
 triangular.

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Electrical Machines
If the field winding connection of DC shunt motor is changed

 motor will become slow.
 motor will not run.
  It will run in opposite direction.
 It will run in same direction.

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

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

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Electrical Machines
The armature core of a DC machine is laminated to minimise

 temperature rise
 hysteresis loss
 eddy-current loss
 mechanical loss

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Electrical Machines
Which of the following relation is correct?

 Xd < Xq.
None of these
 Xd = Xq.
 Xd > Xq.

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Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 unity
 0.9 lag
 0.2 lag
 0.2 lead

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