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Electrical Machines

Electrical Machines
A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is

 1/3
 1/√3
 3
 √3

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

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

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Electrical Machines
The efficiency of a transformer is mainly dependent on

 copper losses.
 stray losses.
 core losses.
 dielectric losses.

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Electrical Machines
Which of the following is minimized by laminating the core of a transformer?

 Hysteresis loss.
 Eddy current loss.
 Copper loss.
 Stray loss.

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Electrical Machines
For a practical synchronous motor the pull out torque will occur when the torque angle is nearly equal to

 0°.
  75°.
 30°.
 45°.

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Electrical Machines
In a 3 - Φ IM with line frequency f1 and winding factor kw1 and kw2 for stator and rotor respectively the ratio of per phase stator winding emf E1 to per phase rotor winding emf E2 at standstill is given by

  E1 / E2 = f1kw1 / f2kw2.
  E1 / E2 = N1 / N2.
  E1 / E2 = N1kw1 / N2kw2.
  E1 / E2 = 1.

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