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Electrical Machines

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

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

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Electrical Machines
Exciting current of an induction motor is

  equal as power transformer.
  higher than power transformer.
  lesser than power transformer.
  none of these.

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Electrical Machines
Capacitor in split phase induction motor is used to

 improve the power factor.
 reduce the harmonics.
 start the motor.
 improve the starting torque.

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Electrical Machines
Voltage regulation of transformer is given by

 (E2 - V2) / V2
 (E2 - V2) / E2
 (V2 - E2) / V2
 (V2 - E2) / E2

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Electrical Machines
The overall power factor of an on load transformer

 is always lagging.
 is always leading.
 is always unity.
  depends on the power factor of the load.

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Electrical Machines
Belt conveyors offer _______________ starting torque.

  medium.
  high.
  zero.
  low.

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