GATE PI topic:metal-forming PYQs & Answers

Questions 1–10 of 23. Imported answers require independent review unless marked reviewed.

Which ONE or MORE among the following options CORRECTLY match(es) the type of defects with the corresponding metal working processes in which they are likely to occur?

Defect	Process
P: Centerburst	1: Deep drawing
Q: Earing	2: Rolling
R: Zipper cracks	3: Extrusion
S: Cold shut	4: Closed die forging
	5: Casting

Your answerSelect all correct options. You can choose more than one.

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

P-5; Q-2; R-3; S-4

P-1; Q-2; R-4; S-5

P-3; Q-1; R-2; S-5

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A square of side length 50 mm is to be blanked from a strip of 2 mm thickness. The sheet metal has a shear strength of 200 MPa.

To enable a single step blanking operation, the theoretical minimum blanking force required is _____ × 10³ N (in integer).

Note: Neglect the effect of clearances and friction.

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A sheet metal drawing is considered feasible if the following conditions are met: • Reduction ratio < 0.5 • Thickness to diameter ratio > 1%

A sheet metal drawing process is being planned on a sheet metal with a thickness of 2 mm with a punch of diameter 100 mm with various blanks of diameter

Which ONE of the following blank diameters

(in mm) will result in feasible drawing?

Your answerChoose one option.

150

250

350

450

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In a rolling operation, a 200 mm wide strip of 23 mm thickness needs to be reduced to 20 mm in a single pass. The roll diameter is 200 mm. Four lubricants P, Q, R, and S with coefficient of friction 0.05, 0.1, 0.2, and 0.25, respectively, are available for use at the roll-strip interface. Assume that the strip width remains constant throughout the process.

Which ONE or MORE among the following lubricants will enable the rolling process to achieve the desired final thickness of the strip in a single pass?

Your answerSelect all correct options. You can choose more than one.

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Match each of the listed defects in deep drawing cup with the corresponding reason in the table.

Defect in deep drawing cup	Reason
P: Orange peel on the surface of cup	1: No blank holding force
Q: Wrinkling at the flange of cup	2: Very small corner radius of the punch
R: Tearing at the bottom corner of cup	3: Large grain size in the blank material
S: Earing at the top edge of the cup	4: Anisotropy of the blank material

Your answerChoose one option.

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

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

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

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

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A blank of 100 mm diameter is to be cut out of a 2 mm thick sheet through blanking operation. If the radial clearance between the punch and die is 6% of the sheet thickness then the diameter (in mm) of the punch is ________ . (Rounded off to 2 decimal places)

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In a forming operation, the plastic deformation of a steel specimen starts under plane stress condition, where the principal stresses are

MPa and

MPa. If the steel specimen follows von-Mises yield criterion, then the uniaxial tensile yield strength (in MPa) of this steel material is ____ (Rounded off to 1 decimal place)

Your answerChoose one option.

173.2

200.0

100.0

223.6

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In a single pass cold rolling operation, a flat plate is reduced to a thickness of 3 mm. In this operation, two rolls of diameter 400 mm each are rotating in opposite direction at 300 RPM, and the elastic deflection of these rolls is negligible. The angle of bite is 10°. If the neutral point is present at an angle of 7° from the exit side, then the thickness of the plate (in mm) at the neutral point is ________. (Rounded off to 1 decimal place)

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A copper rod of 200 mm diameter and 400 mm length is extruded to the final diameter of 100 mm. The extrusion ratio is

Your answerChoose one option.

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Match the products to be manufactured with the given metal working processes.

Product: P—Beverage can; Q—Seamless pipe; R—Connecting rod; S—Steel balls for bearing.

Process: 1—Forging; 2—Skew Rolling; 3—Extrusion; 4—Deep Drawing.

Your answerChoose one option.

P – 3, Q – 4, R – 1, S – 2

P – 2, Q – 4, R – 1, S – 3

P – 4, Q – 3, R – 2, S – 1

P – 4, Q – 3, R – 1, S – 2

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GATE PI topic:metal-forming PYQs

How to practice topic:metal-forming

Question 26

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Question 39

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Question 22

Question 43