Metallurgical Engineering
GATE MT topic:materials-science PYQs
Build your understanding with focused practice from past exam papers.
Questions 511–520 of 650. Imported answers require independent review unless marked reviewed.
Question 46
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100 Metric tons of copper concentrate containing 21 wt.% Cu is to be processed in 6 months with 25 working days per month and 8 working hours per day. The concentrate is leached by sulphuric acid and electrolyzed in 10 cells arranged in series. The minimum current rating (Ampere per month per cell, rounded off to the nearest integer) is ________.
Given: Faraday constant = 96500 Coulomb per gram equivalent. Atomic weight of copper is 63.
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Cold working of iron leads to increase in dislocation density from
to
. The associated stored energy (in
, rounded off to one decimal place) is ________.Given: Shear modulus of iron = 82 GPa, Burger’s vector,
,
nm.Log in to check the answer
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The critical radius (in nm, rounded off to one decimal place) of nickel nucleus during solidification at 1673 K is ________.
Given: Enthalpy of fusion of nickel =
; Liquid-solid interfacial energy = 0.5
, and Equilibrium melting temperature of nickel = 1728 K.Log in to check the answer
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A material, made up of alternating layers of metals A and B, is loaded as shown below. If the volume % of B is 25%, the elastic modulus (in GPa, rounded off to one decimal place) of the material is ________.
Given: Elastic moduli of A and B are 200 GPa and 100 GPa, respectively.
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The S-N curve for a steel is shown below. If the stress ratio, (
) =
, the maximum stress (in MPa, rounded off to the nearest integer) that the steel can withstand for infinite fatigue life is ________.
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True stress - true strain behavior of a metal is given by the flow curve equation
where
is in MPa. The true stress at necking (in MPa, rounded off to the nearest integer) is ________.Log in to check the answer
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In sand-mold casting of a metal, it takes 180 seconds to complete solidification of a 27 cm
cube-shaped casting. All other parameters remaining constant, the total solidification time (in seconds, rounded off to one decimal place) for a cylinder-shaped [radius = 1 cm and height = 6 cm] casting of the same metal, is ________.Log in to check the answer
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If the solid-solid interfacial energy (
) is 0.87
and solid-liquid interfacial energy (
) is 0.5
, the dihedral angle (
, in degree, rounded off to one decimal place) during sintering is ________.
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The maximum possible reduction (in mm, rounded off to one decimal place) of a 100 mm thick slab during rolling is ________.
Given: The coefficient of friction between roll and the slab is 0.2, and the roll diameter is 200 mm.
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An arc welding is performed at 400 Amperes, 20 V at a traverse speed of 5
. If the heat transfer efficiency is 0.6, the energy input per unit length (in
, rounded off to the nearest integer) during the process is ________.Log in to check the answer
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