Electrical Machines
Which one of the following statement is correct ? In an induction motor if the air gap is increased then

 its speed will increase
 its speed will reduce
 its efficiency will improve
 its power factor will reduce

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Electrical Machines
For satisfactory parallel operation of two transformers which of the following conditions is most essential,

 percentage impedance of all transformers must be same.
  polarities of all transformers must be same.
 voltage ratio of all transformers must be same.
 MVA rating of all transformer inversely proportional to impedance.

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