Mechanical Engineering
GATE ME concept:rolling PYQs
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How to practice concept:rolling
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Questions 1–8 of 8. Imported answers require independent review unless marked reviewed.
Question 41
Open questionMEMCQ2 marksNeeds review
A plate of 30 mm thickness is fed through a rolling mill with two powered rolls. Each roll has a diameter of 500 mm. The plate thickness is to be reduced to 27 mm in a single pass. Assume no change in width. The process feasibility and the maximum draft (in mm) can be represented, respectively, as
Use the coefficient of friction as 0.12
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 29
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The “Earing” phenomenon in metal forming is associated with
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 56
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A 4 mm thick aluminum sheet of width
mm is rolled in a two-roll mill of roll diameter 200 mm each. The workpiece is lubricated with a mineral oil, which gives a coefficient of friction,
. The flow stress (
) of the material in MPa is
, where
is the true strain. Assuming rolling to be a plane strain deformation process, the roll separation force (
) for maximum permissible draft (thickness reduction) is ________ kN (round off to the nearest integer).Use:
where
is average flow stress,
is roll-workpiece contact length, and
is the average sheet thickness.Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 40
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A 200 mm wide plate having a thickness of 20 mm is fed through a rolling mill with two rolls. The radius of each roll is 300 mm. The plate thickness is to be reduced to 18 mm in one pass using a roll speed of 50 rpm. The strength coefficient (
) of the work material flow curve is 300 MPa and the strain hardening exponent,
is 0.2. The coefficient of friction between the rolls and the plate is 0.1. If the friction is sufficient to permit the rolling operation then the roll force will be ______ kN (round off to the nearest integer).Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 41
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The thickness, width and length of a metal slab are 50 mm, 250 mm and 3600 mm, respectively. A rolling operation on this slab reduces the thickness by 10% and increases the width by 3%. The length of the rolled slab is ____________ mm (round off to one decimal place).
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 46
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The thickness of a steel plate with material strength coefficient of 210 MPa, has to be reduced from 20 mm to 15 mm in a single pass in a two-high roll mill with a roll radius of 450 mm and rolling velocity of 28 m/min. If the plate has a width of 200 mm and its strain hardening exponent, n is 0.25, the rolling force required for the operation is ______ kN (round off to 2 decimal places).
Note: Average Flow Stress = Material Strength Coefficient × (True Strain)^n/(1+n)
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 52
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The thickness of a sheet is reduced by rolling (without any change in width) using 600 mm diameter rolls. Neglect elastic deflection of the rolls and assume that the coefficient of friction at the roll-workpiece interface is 0.05. The sheet enters the rotating rolls unaided. If the initial sheet thickness is 2 mm, the minimum possible final thickness that can be produced by this process in a single pass is _____ mm (round off to two decimal places).
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 14
Open questionMEMCQ1 markNeeds review
Match the following products with the suitable manufacturing process
Product | Manufacturing Process |
|---|---|
P — Toothpaste tube | 1 — Centrifugal casting |
Q — Metallic pipes | 2 — Blow moulding |
R — Plastic bottles | 3 — Rolling |
S — Threaded bolts | 4 — Impact extrusion |
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