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Electrical Machines

Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 1/S
 1-S
 S
 1/(1-S)

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Electrical Machines
Dynamic braking can be used for

 series motors.
All of these
 shunt motors.
 compound motors.

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Electrical Machines
In a Dc generator the magnetic neutral axis coincide with geometrical neutral axis, when

  the generator runs on designed speed.
  the generator runs on overload.
  there is no load on the generator.
  the generator runs on full load.

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

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

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Electrical Machines
For the same power output rating and full load speed, the motor will have poorest starting torque, is

 Cummulative compound.
 Differential compound.
  Shunt.
 Series.

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Electrical Machines
Two DC series motors are connected in series and are driving the same mechanical load. If the motors are now connected in parallel the speed will become

 half.
 one fourth.
 double.
 4 times.

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MORE MCQ ON Electrical Machines

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