Alternating Current - Result Question 38
40. The core of a transformer is laminated because
[2006]
(a) the weight of the transformer may be reduced
(b) rusting of the core may be prevented
(c) ratio of voltage in primary and secondary may be increased
(d) energy losses due to eddy currents may be minimised
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Answer:
Correct Answer: 40. (d)
Solution:
- (d) When there is change of flux in the core of a transformer due to change in current around it, eddy current is produced. The direction of this current is opposite to the current which produces it, so it will reduce the main current. We laminate the core so that flux is reduced resulting in the reduced production of eddy current.
