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Electrical Machines

Electrical Machines
Which of the following relation is correct?

 Xd > Xq.
None of these
 Xd < Xq.
 Xd = Xq.

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Electrical Machines
Stray losses in transformer occurs in

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

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Electrical Machines
In which transformer, the tertiary winding is used?

 Star - star
 Star - delta
 Delta - delta
 Delta - star

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Electrical Machines
The air gap between stator and the rotor of the 3 - φ induction motor is kept

  as wide as possible.
  as small as possible.
  depends on the material of stator and the rotor.
  air gap does not matter.

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Electrical Machines
Series field consists of--------number of turns and ---------- conductors respectively

 large and thick
 less and thin
 less and thick
 large and thin

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Electrical Machines
The direction of rotation of a DC motor can be determent by

  Flemings left hand rule.
 Amperes law.
 Lenzs law.
 Flemings right hand rule.

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