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Electrical Machines

Electrical Machines
Lamination of transformer core is made of

 cast steel.
 wrought iron.
  silicon steel.
  cast iron.

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Electrical Machines
Which of the following machine will have maximum efficiency?

  Electrical power transformer.
 Induction motor.
 DC motor.
 Electrical power generator.

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Electrical Machines
The slip of an induction motor during DC rheostatic braking is

 2 + s.
 1 - s.
  2 - s.
  s.

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Electrical Machines
A single-phase transformer has its maximum efficiency at 60 percent of full load. At full load copper loss will be

 equal to core loss.
 zero.
  more than core loss.
 less than core loss.

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Electrical Machines
Maximum allowable tan - delta (tanδ) of dielectric dispassion factor of power transformer insulating oil is generally taken as

 3 at 90°C.
  1 at 90°C.
 0.5 at 90°C.
 2 at 90°C.

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Electrical Machines
When an electric train is moving down a hill, the DC motor will operate as

 DC shunt generator.
  DC series generator.
  DC series motor.
 DC shunt motor.

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