# GATE Papers >> Mechanical >> 2017 >> Question No 48

Question No. 48

A 10 mm deep cylindrical cup with diameter of 15 mm is drawn from a circular blank. Neglecting the variation in the sheet thickness, the diameter (upto 2 decimal points accuracy) of the blank is _________ mm.

##### Answer : 28.71 to 28.73

Solution of Question No 48 of GATE 2017 Mechanical Paper

$\mathrm h=10\;\mathrm{mm}$

$\mathrm d=15\;\mathrm{mm}$

$\mathrm D=\sqrt{\mathrm d^2+4\mathrm{dh}}=\sqrt{225+600}$

$\mathrm D=28.72\;\mathrm{mm}$