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Electrical Machines

Electrical Machines
Which of the following is the largest conversion device?

All of these
 DC machine
 Induction machine
 Synchronous machine

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Electrical Machines
Under which of the following conditions hunting of synchronous motor is likely to occur ?

  Over-excitation.
  Small and constant load.
  Over-loading for long period.
  Periodic variation of load.

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Electrical Machines
Reversing the direction of rotation of split phase motors is done by

 reversing the terminals of starting winding.
 interchanging the capacitor from starting winding to main winding or vice versa.
All of these
 reversing the terminals of main winding.

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Electrical Machines
_____________ types of induction motor are widely used.

  Single phase IM.
  Three phase IM.
  Squirrel cage IM.
  Slip ring IM.

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Electrical Machines
Dissolve gas analysis of transformer oil is carried out to determine

 condition of bushing stud.
 condition of transformer oil.
  condition of transformer.
 condition of bushings.

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

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

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