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Electrical Machines

Electrical Machines
Pole changing methods are suitable only for ___________ type induction motor.

  linear.
  wound.
  none of these.
  cage.

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Electrical Machines
The three point starter is used for

  Shunt motor as well as compound motors.
  Series motor.
  Shunt, compound and series motor.
  Shunt motor.

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Electrical Machines
The stator frame in an induction motor is used to

  hold armature stamping in position.
  ventilate the armature.
  protect the whole machine.
  provide return path for the flux.

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Electrical Machines
A single-winding single-phase motor has

  zero starting torque.
 starting torque equal to full-load torque.
 low starting torque.
 high starting torque.

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Electrical Machines
Maximum allowable tan - delta (tanδ) of dielectric dispassion factor of power transformer insulating oil is generally taken as

 3 at 90°C.
  1 at 90°C.
 2 at 90°C.
 0.5 at 90°C.

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Electrical Machines
Series booster is a

 shunt wound DC generator.
 permanent magnet DC generator.
 separately excited DC generator.
  series wound DC generator.

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