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Electrical Machines

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

 100
 50
 10
 1

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Electrical Machines
At what power factor, the voltage regulation of a transformer can be zero ?

 Unity power factor.
 Zero power factor.
 Lagging power factor.
  Leading power factor.

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Electrical Machines
The speed of a cumulatively compound DC motor can be controlled by varying

 Armature resistance control.
 Shunt field resistance control.
 Any of above.
 Armature voltage control.

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Electrical Machines
In case of IM the torque is

  inversely proportional to slip.
  directly proportional to slip.
  inversely proportional to √slip.
  directly proportional to slip2.

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Electrical Machines
Oil is provided in an oil filled transformer for

  insulating.
  both cooling and insulation.
 cooling.
 lubrication.

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Electrical Machines
The noise resulting from vibrations of lamination set by magnetic forces, is termed as

 zoom.
  hum.
 magnetostriction.
 boo.

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