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Q#1 Error Analysis GATE EE 2014 MCQ +2 marks -0.66 marks

The mean thickness and variance of silicon steel laminations are 0.2mm 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 0.1mm 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

30mm and 0.22

30mm and 2.44

40 mm and 2.44

40mm and 0.24

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