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Electrical Machines

Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 flat-topped
 rectangular
 sinusoidal
 co- sinusoidal

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

 zoom.
 boo.
 magnetostriction.
  hum.

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Electrical Machines
Stray losses in transformer occurs in

 transformer insulating oil.
  winding conductors and steel structures of transformer.
 paper insulation in transformers.
 steel core.

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Electrical Machines
Saving of copper in auto transformer is increased as compared to two winding transformer, when transformation ratio K approaches to

  unity.
 zero.
 two.
 infinity.

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Electrical Machines
Winding conductors of an electrical power transformer are mainly insulated by

 rubber insulation.
 cotton insulation.
  paper insulation.
 wooden insulation.

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Electrical Machines
A 220 V DC machine has an armature resistance 1 Ω. If the full load current is 20 A, the difference of induced voltage between generator and motor is

 40 V.
 0 V.
 60 V.
 20 V.

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