GATE PI 2018 Paper 1 — page 21

Questions 61–63 of 65. Imported answers require review unless explicitly marked reviewed.

The worktable in a CNC machine is driven by a leadscrew with a pitch of 2 mm. The leadscrew is directly coupled to a stepper motor of step angle 1.8°. The number of pulses required to move the worktable by 50 mm is _____

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During orthogonal machining of a job at a cutting speed of 90 m/min with a tool of 10° rake angle, the cutting force and thrust force are 750 N and 390 N, respectively. Assume a shear angle of 35°. The power (in W) expended for shear along the shear plane is _____

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In an electrochemical machining of aluminium with plane parallel electrodes, the current density is 70 A/cm

. Cross-sectional area of each electrode is 3 cm

. The current efficiency (i.e., the fraction of current used for dissolution of metal) is 80%. Gram atomic weight, valency and density of aluminium are 27 gram, 3 and 2700 kg/m

, respectively. Take Faraday’s constant as 96500 Coulomb. The volumetric material removal rate (in mm

/min) is _____

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2018 · Paper 1

Question 51

Question 52

Question 53