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?

 68%
 38%
 60%
 40%

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Electrical Machines
The speed of a DC series motor is

 Proportional to field current.
 Proportional to the armature current.
 Inversely proportional to the armature current.
 Proportional to the square of the armature current.

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