GATE PI topic:metal-forming PYQs & Answers — Page 2

Questions 11–20 of 23. Imported answers require independent review unless marked reviewed.

During a hot-working process, the homologous temperature is 0.8. The melting point of the work metal is 800 °C. The temperature (in °C) during hot-working is____________. [round off to nearest integer]

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A workpiece of 30 mm diameter and 40 mm height is compressed between two plates in an open die forging process. Assume a perfectly plastic material with a flow stress of 300 MPa. The ideal forging load (in kN) at 30% reduction (in height) is____________. [round off to nearest integer]

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Match the component with the corresponding manufacturing process in the table below.

Component	Manufacturing process
P: Aluminum alloy piston for IC engine	1: Blow molding
Q: Low carbon steel oil pan	2: Powder metallurgy
R: Tungsten carbide cutting tool insert	3: Sand casting
S: Plastic bottle	4: Deep drawing

Your answerChoose one option.

P-3, Q-2, R-1, S-4

P-3, Q-4, R-2, S-1

P-2, Q-3, R-4, S-1

P-1, Q-3, R-2, S-4

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A cylindrical mild steel tensile test specimen of gauge length 50 mm and diameter 10 mm is extended in two stages at a deformation speed of 4 mm/min. The specimen is extended from 50 mm to 55 mm in the first stage, and from 55 mm to 60 mm in the second stage. Neglecting elastic deformation, the total longitudinal true strain is ____________. [round off to 2 decimal places]

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A wire of 5 mm diameter is drawn into a wire of 4 mm diameter through a conical die at a constant pulling speed of 5 m/s. Neglecting the coefficient of friction and redundant work, the drawing stress (

) in MPa for the above process is given by

, where

is the mean flow strength of wire material in MPa, and

is the ratio of decrease in area of cross-section to initial area of cross-section of the wire. If the mean flow strength of wire material is 600 MPa, then the power required in kW in the above wire drawing process is ________. [round off to 2 decimal places]

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A 3.5 mm thick sheet is rolled using a two high rolling mill to reduce the thickness under plane strain condition. Both rolls have a diameter of 500 mm and are rotating at 200 RPM. The coefficient of friction at the sheet and roll interface is 0.08, and the elastic deflection of the rolls is negligible. If the mean flow strength of the sheet material is 400 MPa, then the minimum possible thickness (in mm) of sheet that can be produced in a single pass is ________. [round off to 2 decimal places]

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A cylindrical billet of 90 mm diameter is extruded to produce an I-section as shown in the figure (all dimensions in mm).

Diagram for Production and Industrial Engineering question 44

The total extrusion pressure (

) in MPa required for the above process is given by

where,

is the mean flow stress of the material, and

and

are the initial and the final cross-sectional areas, respectively. If the mean flow stress of the extruded material is 80 MPa, the force required for the above extrusion (rounded off to one decimal place) in kN is __________.

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The end product obtained using spinning process is shown in the figure. The initial blank thickness is 2.5 mm. The blank diameter (in mm) is

Diagram for Production and Industrial Engineering question 10

Your answerChoose one option.

105

150

210

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A 100 mm long cylindrical workpiece of diameter 50 mm is reduced to 25 mm diameter using extrusion process. The flow curve for the metal has strength coefficient as

MPa and the strain hardening co-efficient is 0.15. Assuming no friction and no redundant work, the required ram pressure (in MPa) is closest to

Your answerChoose one option.

164

364

428

950

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In a two-pass wire drawing process, there is a 40% reduction in wire cross-sectional area in 1st pass and further 30% reduction in 2nd pass. The overall reduction (in percentage) is ______

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GATE PI topic:metal-forming PYQs

Question 49

Question 50

Question 8

Question 19

Question 43

Question 55

Question 44

Question 10

Question 32

Question 24