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Electrical Machines

Electrical Machines
Oil is provided in an oil filled transformer for

  insulating.
  both cooling and insulation.
 lubrication.
 cooling.

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Electrical Machines
At slip s = 1 torque developed in machine is

  electromagnetic torque.
  maximum torque.
  starting torque.
  none.

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Electrical Machines
The magnetic field which initially induces emf in the armature in a self excited DC generator is because of

  residual magnetism.
  permanent magnets.
None of these
 armature reaction.

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Electrical Machines
To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be

 36°
 30°
 18°
 72°

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Electrical Machines
A 4 pole DC generator rotates at 1500 rpm. How many times in a second, will the emf induced in each armature conductor changes its direction?

  100.
 200.
 500.
 750.

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Electrical Machines
Iron losses in a DC machine are independent of variation in

  voltage.
  load.
 speed.
  speed and voltage.

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MORE MCQ ON Electrical Machines

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