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Electrical Machines

Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  get over heated.
  not run.
  run normally.
  make noise.

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Electrical Machines
In DC generator, full form of MNA is what?

  Magnetic neutral axis.
 Magnetic no-load axis.
 Magnetic neutral armature co-ordinate.
 Magnetically no-load armature co-ordinate.

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Electrical Machines
The induction motor shaft is made of

  stainless steel.
  cast iron.
  aluminium.
  mild steel.

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Electrical Machines
When applied rated voltage per phase is reduce to one half, the starting torque of three phase squirrel cage induction motor becomes

 4 time the initial value
 1/4 of the intial value
 1/2 of the initial value
 twice the initial value

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Electrical Machines
In an auto transformer, for what value of turn ratio, power transferred by inductively and conductively are same?

 0.5
 any of the above
 0
 1

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

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

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