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Electrical Machines

Electrical Machines
In DC generators, the residual magnetism is of the order of

  20 %.
 10 %.
  15 %.
  2.5 %.

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Electrical Machines
If the temperature of armature resistance is increased, the speed of a series motor would

 None of above.
 increase.
 not change.
 decrease.

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Electrical Machines
If we increase the rotor reactance value, the maximum torque will

 increase
 decrease
 not changed
None of these

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Electrical Machines
What is the increase in the torque expressed as percentage of initial torque, if current drawn by the dc series motor is increased from 10A to 11A?

 41%
 21%
 11%
 10%

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Electrical Machines
When pure inductive load is connected to the alternator, what is the effect of armature reaction?

 Magnetization
 Cross magnetization
 Demagnetization
None of these

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Electrical Machines
Select the motor that should not be started on no load?

 Compound motor.
  Series motor.
 Brushless DC motor.
 Shunt motor.

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MORE MCQ ON Electrical Machines

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