ELECTRICAL MACHINES QUIZ

 boo.

 zoom.

  hum.

 magnetostriction.

  pulling the motor directly on line without a rotor.

  locking of rotor due to harmonics.

  starting the motor on load which is more than the rated load.

  interchanging two supply phases for quick stopping.

 inversely as applied voltage

None of these

 directly as applied voltage

 directly as square of applied voltage

None of these

 decrease

 not changed

 increase

 decreases.

None of these

 increases.

 remains same.

  hysteresis losses.

  ohmic losses.

  mechanical losses.

  eddy current losses.

 Shunt excited and should have the same polarity as that of the behind main pole in the direction of rotation of armature.

 Shunt excited and should have the same polarity as that of the ahead main pole in the direction of rotation of armature.

 Series excited and should have the same polarity as that of the ahead main pole in the direction of rotation of armature.

 Series excited and should have the same polarity as that of the behind main pole in the direction of rotation of armature.

 increasing armature cooling.

  increasing input power of the prime mover.

  increasing terminal voltage.

  increasing armature resistance.

 6.

  2.

  4.

  data provided is insufficient.

 dissipate more heat.

 reduce armature reaction.

 reduce iron weight.

 reduce pulsation loss.