Electrical Machines
A transformer core is made up of a silicon steel laminations which has maximum flux density 1 Tesla. If it was cold rolled grain oriented its flux density increases to 1.6 Tesla. What is the saving in core size or area due to cold rolled grain oriented process?

 38%
 60%
 68%
 40%

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Electrical Machines
Where the shunt generators are widely used?

 Where the load is very high.
  Where a constant voltage is required over a narrow load range.
 Where often load fluctuation is occurred.
 Where voltage variation is needed over a wide load range.

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