# Gate EE-2014-3 Question Paper With Solutions

Q. 37 The mean thickness and variance of silicon steel laminations are 0.2 mm and
0.02 respectively. The varnish insulation is applied on both the sides of the
laminations. The mean thickness of one side insulation and its variance are 0.1
mm and 0.01 respectively. If the transformer core is made using 100 such varnish
coated laminations, the mean thickness and variance of the core respectively are

(A) 30 mm and 0.22

(B) 30 mm and 2.44

(C) 40 mm and 2.44

(D) 40 mm and 0.24