GATE PI topic:machining PYQs & Answers — Page 2

Questions 11–20 of 34. Imported answers require independent review unless marked reviewed.

During orthogonal turning, the cutting speed, feed and depth of cut are set as 2 m/s, 0.2 mm/rev and 2 mm, respectively. The specific cutting energy (neglecting the effect of feed force on the total cutting power) is 2 J/mm

. The main cutting force (in N) is ________. (Answer in integer)

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As per the ANSI marking system, a grinding wheel with alumina as abrasive is designated as

. Here, K indicates that

Your answerChoose one option.

abrasive used in the wheel is aluminum oxide

hardness of the wheel is medium

bonding material of the wheel is shellac

structure of the wheel is dense

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The combination of Directrix and Generatrix in a machining operation is shown in figure. The surface produced is

Diagram for Production and Industrial Engineering question 17

Your answerChoose one option.

cylindrical

planar

helical

parabolic

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In an orthogonal cutting with a tool of rake angle 0°, the value of the cutting force is two times of the thrust force. The coefficient of friction is _____ (round off to 1 decimal place).

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A straight turning operation is carried out at the feed rate of 100 mm/min using a single point cutting tool with signature

(ASA). The spindle speed is 1600 rpm. The roughness, in μm, of the machined surface in terms of peak-to-valley height is _____ (round off to 2 decimal places).

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A single-point cutting tool with zero rake angle is used for orthogonal machining. If the chip-compression ratio is 1.25, then the shear angle (in degree) during machining is____________. [round off to one decimal place]

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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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In a turning operation, doubling the cutting speed (

) reduces the tool life (

) to

th of the original tool life. The exponent

in the Taylor’s tool life equation,

Your answerChoose one option.

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A single point cutting tool with 15° orthogonal rake angle is used to machine a mild steel plate under orthogonal machining condition. The depth of cut (uncut thickness) is set at 0.9 mm. If the chip thickness is 1.8 mm, then the shear angle in degree is ________. [round off to one decimal place]

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GATE PI topic:machining PYQs

Question 58

Question 16

Question 17

Question 56

Question 58

Question 29

Question 52

Question 53

Question 9

Question 46