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Electrical Machines

Electrical Machines
Field weakening control method is used for the _________ ?

 both A and B
 above rated speed
None of these
 below rated speed

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Electrical Machines
The working principle of transformer depends on

 Coulombs law.
 Faradays law of electromagnetic induction.
 Amperes law.
 Newtons law.

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

  Commutator.
 Conservator tank.
 Tap changer.
 Radiator.

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Electrical Machines
In DC series motor the speed is ______________ proportional to the armature current.

 none of these.
 has no relation.
 inversely.
 directly.

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Electrical Machines
Addition of 0.3 % to 4.5 % silicon to iron

  reduces the saturation magnetization.
None of these
  increases the hysteresis loss.
  increases the electrical resistivity of iron.

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Electrical Machines
What is/are the necessary conditions for parallel operation of alternators?

 Both 1and 2
 Speed of alternators should be same
 Terminal voltage is same
 Frequency should be same

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