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Electrical Machines

Electrical Machines
Slip rings of an induction motors are made of

  carbon.
  aluminium.
  phosphor bronze.
  stainless steel.

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

 6 V
 240 V
 234 V
 474 V

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

 decrease.
 not change.
 increase.
 None of above.

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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.
  run in a direction opposite to previous one.
  continue running in the same direction as before.

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Electrical Machines
When an electric train is moving down a hill, the DC motor will operate as

 DC shunt generator.
 DC shunt motor.
  DC series motor.
  DC series generator.

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Electrical Machines
Capacitor in split phase induction motor is used to

 start the motor.
 improve the starting torque.
 reduce the harmonics.
 improve the power factor.

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MORE MCQ ON Electrical Machines

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