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Electrical Machines

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

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

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Electrical Machines
Lamination of core are generally made of

 stainless steel.
 carbon.
 cast iron.
 silicon steel.

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Electrical Machines
What will be the eddy current loss if the supply frequency of a transformer becomes double?

 Eight times.
 Four times.
 Doubled.
 Remains same.

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Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

 0.3.
 0.7.
  0.54.
  1.

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Electrical Machines
In a synchronous generator, if mechanical input is increased with constant excitation, the load angle will

None of these
 either increase or decrease
 increase
 decrease

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Electrical Machines
In dc machines, the field-flux axis and armature-mmf axis are respectively along

 quadrature axis and interpolar axis
 direct axis and indirect axis
 quadrature axis and direct axis
 direct axis and interpolar axis

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