GATE ME 2020 Paper 2 — page 18

Questions 52–54 of 65. Imported answers require review unless explicitly marked reviewed.

A mould cavity of 120 cm

volume has to be filled through a sprue of 10 cm length feeding a horizontal runner. Cross-sectional area at the base of the sprue is 2 cm

. Consider acceleration due to gravity as 9.81 m/s

. Neglecting frictional losses due to molten metal flow, the time taken to fill the mould cavity is ______ seconds (round off to 2 decimal places).

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A cylindrical bar with 200 mm diameter is being turned with a tool having geometry 0° - 9° - 7° - 8° - 15° - 30° - 0.05 inch (Coordinate system, ASA) resulting in a cutting force

. If the tool geometry is changed to 0° - 9° - 7° - 8° - 15° - 0° - 0.05 inch (Coordinate system, ASA) and all other parameters remain unchanged, the cutting force changes to

. Specific cutting energy (in J/mm

) is

, where

is the specific energy coefficient, and

is the uncut thickness in mm. The value of percentage change in cutting force

, i.e.

, is ______ (round off to one decimal place).

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There are two identical shape machines S

and S

. In machine S

, the width of the workpiece is increased by 10% and the feed is decreased by 10%, with respect to that of S

. If all other conditions remain the same then the ratio of total time per pass in S

and S

will be ______ (round off to one decimal place).

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2020 · Paper 2

Question 42

Question 43

Question 44