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Electrical Machines

Electrical Machines
Capacitor fitted with ceiling / table fans is of the value of

  1 - 2 µF.
  2 - 3 µF.
 0.1 µF.
 5 - 10 F.

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Electrical Machines
The noise resulting from vibrations of lamination set by magnetic forces, is termed as

 magnetostriction.
 boo.
 zoom.
  hum.

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

 Conservator tank.
  Commutator.
 Radiator.
 Tap changer.

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Electrical Machines
Ward Leonard control provides speed control

 below rated speed.
 in both direction.
 in one direction only.
 above rated speed.

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Electrical Machines
The direction of generated emf in the armature coil of a DC machine is 1. the same as that of the current in a generator 2. the same as that of the current in a motor 3. opposite to that of the current in a generator 4. opposite to that of the current in a motor From these, the correct answer is

 1, 4
 2, 4
 2, 3
 1, 3

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Electrical Machines
What is the shunt resistance component equivalent circuit obtained by no load test of an induction motor representative of ?

 windage and friction loss
 core loss only
 both 1 and 2
 Copper loss

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