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Electrical Machines

Electrical Machines
Which of the following DC generators has rising V-I characteristics?

  Compound.
  Series.
  Shunt.
  None of them.

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Electrical Machines
The frame of an induction motor is made of

  aluminium.
  silicon steel.
  closed grained cast iron.
  stainless steel.

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Electrical Machines
What is the increase in the torque expressed as percentage of initial torque, if current drawn by the dc series motor is increased from 10A to 11A?

 41%
 21%
 11%
 10%

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Electrical Machines
A DC series motor must started on no load because it would

 Fail to start without load.
  Run at dangerously high speed.
 Not develop starting torque.
 Draw more current without producing sufficient torque.

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Electrical Machines
Slip exists in

  induction motor.
  none of above.
  in both machines.
  synchronous motor.

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Electrical Machines
Variation in speed by ward-Leonard control of DC motors occurs due to variation in

  Armature voltage.
  Armature current.
  Supply voltage.
  Field excitaion.

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MORE MCQ ON Electrical Machines

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