# GATE Papers >> Mechanical >> 2016 >> Question No 62

Question No. 62

A 300 mm thick slab is being cold rolled using roll of 600 mm diameter. If the coefficient of friction is 0.08, the maximum possible reduction (in mm) is __________

##### Answer : 1.90 : 1.94

Solution of Question No 62 of GATE 2016 Mechanical Paper

$\begin{array}{l}\mathrm D=600\;\mathrm{mm}\;\;\;\;\mathrm R=300\;\mathrm{mm}\;\;\;\;\mathrm\mu=0.08\\\triangle{\mathrm h}_\max=\mathrm\mu^2\mathrm R=\left(0.08\right)^2\times\frac{600}2\\\triangle{\mathrm h}_\max=1.92\;\mathrm{mm}\end{array}$

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