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Electrical Machines

Electrical Machines
Universal motor have which of the following application?

  Lift.
  Domestic pump.
  Traction.
  Food mixer.

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Electrical Machines
The speed of a 3-phase induction motor operating in its stable region

 increases with increase in the load torque.
 decreases with decrease in the load torque.
 decreases with increase in the load torque.
 remains constant.

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Electrical Machines
The constant losses in transformer is/are

 both 2 and 3.
 hysteresis loss.
 copper loss.
 eddy current loss.

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Electrical Machines
If the back emf in DC motor vanishes suddenly the motor will

 run at very low speed.
 burn.
 start haunting.
 run at very high speed.

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Electrical Machines
If in a sub – station there is one 132 / 33 kV transformer whose secondary is connected with primary of one 33 / 11 kV transformer, the total transformation ratio of the sub – station will be,

 7.
 4.
 3.
  12.

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Electrical Machines
Which of the following is not a part of transformer?

 Tap changer.
  Commutator.
 Conservator tank.
 Radiator.

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MORE MCQ ON Electrical Machines

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