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Electrical Machines

Electrical Machines
A DC generator beyond critical resistance will generate

 maximum voltage.
 maximum current.
 maximum power.
 no voltage.

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Electrical Machines
The condition for maximum running torque is

 unity
 R = S.X
 0.707 lagging
 zero
 0.5 lagging

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Electrical Machines
In a seperately excited DC Motor if field current is increased, it will

 Reduce starting torque.
 Reduce armature heating.
 Increase speed
 Increase acceleration duration.

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Electrical Machines
If B is flux density, l the length of the conductor and v the velocity of the conductor, then emf is given by

 Bl2v.
 Blv2.
 Bl2v2.
 Blv.

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Electrical Machines
Which of the following motor used in hair dryers?

  Split phase IM.
  Shaded pole IM.
  Cage induction motor.
  Synchronous motors.

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Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 10
 100
 50
 1

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MORE MCQ ON Electrical Machines

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