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Electrical Machines

Electrical Machines
From no load to full load the slip will

None of these
 not change.
 slightly decrease.
 slightly increase.

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Electrical Machines
What are the starters used for starting of cage motors?

  All of these.
 Auto transformer starter.
 DOL starter.
 Star-delta starter.

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Electrical Machines
Which of the following represents the rotating losses of machine?

 All of the them
 Friction and windage losses
 Hysteresis losses
 Eddy current losses

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Electrical Machines
In DC series motor the speed is ______________ proportional to the armature current.

 has no relation.
 none of these.
 inversely.
 directly.

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Electrical Machines
Oil is provided in an oil filled transformer for

  insulating.
  both cooling and insulation.
 lubrication.
 cooling.

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Electrical Machines
If any two leads from slip rings are interchanged in a 3 - Φ induction motor, the motor will

  get damaged.
  run in a direction opposite to previous one.
  continue running in the same direction as before.
  not run.

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