ELECTRICAL MACHINES QUIZ

 remains unaffected

 decreases

 increases

None of these

 deteriorate and the speed falls.

 deteriorate and the speed rises.

 improve and the speed falls.

 improve and the speed rises.

  By varying number of poles.

  Both (A) and (B).

  By varying supply voltage.

  By varying the supply frequency.

  High.

  Equal to 1.

  Same as full load.

  Low.

 Reduced copper loss.

 Increase in weight/KVA.

  Decrease in weight/KVA.

 Reduced iron loss.

 1, 2, 3, 4 and 5

 2, 3, 4

 1, 3, 4, 5

 2, 3, 4, 5

 reduce hunting

 improve the power factor

All of these

 improve starting torque

 4.76%.

 3.76%.

 2.56 %.

 2.57 %.

 0.04, 1.96

 0.04, 0.96

 0.02, 1.98

 0.02, 0.98

  jaw crushers.

  blowers.

  paper mills.

  lifts and hoists.