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GATE Mechanical Engineering (ME) 2020 Shift 1 Solved Paper

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Question : 55 of 65

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A steel part with surface area of

125\ \mathrm{cm}^2

is to be chrome coated through an electroplating process using chromium acid sulphate as an electrolyte. An increasing current is applied to the part according to the following current time relation:

I=12+0.2t

I=

A

t=

time (minutes). The part is submerged in the plating solution for duration of 20 minutes for plating purpose. Assuming the cathode efficiency of chromium to be

15\%

and the plating constant of chromium acid sulphate to be

2.50 \times 10^{-2}\ \mathrm{mm} / \mathrm{A}\text{-}\mathrm{s}

, the resulting coating thickness on the part surface is ________ µm (round off to one decimal place).

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