GATE PI 2022 Paper 1 — page 18

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

During straight turning of a 20 mm diameter steel bar at a spindle speed of 400 revolutions per minute (RPM) with an HSS tool, a tool life of 10 minute was observed. When the same bar was turned at 200 RPM, the tool life increased to 40 minute. The tool life (in minute) while machining the bar at 300 RPM is____________. [round off to nearest integer]

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A cylindrical workpiece is turned using two different tools. Tool 1 has zero nose radius; side and end cutting edge angles are 20° and 10°, respectively. Tool 2 has 0.5 mm nose radius. Both the tools machine at a feed of 0.2 mm/rev. The ratio of ideal maximum height of unevenness on the surface produced by Tool 1 to that produced by Tool 2 is____________. [round off to one decimal place]

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For an electrochemical machining process

where

is the inter-electrode gap in mm at time

in minute, and

is the feed of the tool in mm/minute. The value of λ is 6×10⁻³ cm²/minute. For maintaining a constant inter-electrode gap of 0.1 mm, the feed (in mm/minute) should be____________. [round off to one decimal place]

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2022 · Paper 1

Question 52

Question 53

Question 54