Metallurgical Engineering
GATE MT topic:materials-engineering PYQs
Build your understanding with focused practice from past exam papers.
Questions 421–430 of 650. Imported answers require independent review unless marked reviewed.
Question 21
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For the function
given in the figure, the value of
is _____ (round off to one decimal place). 
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A component subjected to tensile stress in a mechanical device is monitored periodically for cracks by NDT. The NDT technique can only detect cracks (both surface and internal) which are larger than 1 mm. Keeping a 10% margin of safety, the maximum allowed tensile stress on the component will be _____ MPa (round off to the nearest integer).
Given, fracture toughness
and assume crack geometry factor of unity.Log in to check the answer
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An iron plate with a total exposed surface area of 50 cm
undergoes atmospheric corrosion. If 200 g of weight is lost over a period of 10 years, then the corrosion rate is _____ kg·m
·year
(round off to the nearest integer).Log in to check the answer
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In cold-rolling, for the sheet to be drawn into rolls, the angle of contact (or angle of bite) should be less than or equal to _____ degree (round off to one decimal place).
Given, the coefficient of friction between sheet and roll is 0.1
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The number of atoms per unit area in (100) plane of Pb is _____ nm
(round off to the nearest integer).Given, crystal structure and atomic radius of Pb are FCC and 0.175 nm respectively.
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In the edge dislocation configuration given in the figure, dislocations X and Y are fixed and separated by a distance
on the same slip plane. Dislocation Z is free to glide on a parallel slip plane. The two slip planes are separated by a distance
. Which one of the following statements is TRUE regarding the stability of dislocation Z at positions 1, 2 and 3?Assume all dislocations have identical Burgers vector.
Your answerChoose one option.
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Which one of the following dislocation reactions is NOT feasible in a FCC crystal?
Your answerChoose one option.
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A galvanic cell is formed by connecting Zn (
V) and Fe (
V) electrodes immersed in their respective ion solutions. The cell discharges spontaneously with a voltage of 0.5 V. The ratio of the concentration of [Fe
] to [Zn
] ions in the cell is of the order of:Given, R = 8.314 J·mol
·K
, F = 96500 C·mol
, T = 298 KYour answerChoose one option.
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The divergence of the vector field
is:Your answerChoose one option.
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Match the products in Column I with the manufacturing processes in Column II.
Column I
(P) Blades of a gas turbine
(Q) Seamless tubing
(R) Automotive cylinder blocks
(S) Tungsten filament
Column II
Sand casting
Extrusion
Powder metallurgy and wire drawing
Investment casting
Your answerChoose one option.
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