List of top Metallurgical Engineering Questions

Copper ore assaying 10 wt.% Cu is fed to a concentration plant at the rate of 100 tons/h. If the grades of concentrate and tailing are 30 wt.% Cu and 1 wt.% Cu, respectively, the percentage recovery of copper in concentrate is ................... (round off to nearest integer).
Given: 1 ton = 1000 kg
Diffraction pattern of a polycrystalline BCC metal is obtained using monochromatic X-rays of wavelength 0.25 nm. If the first peak occurs at Bragg angle (\(\theta\)) of 30\(^{\circ}\), then the radius of the metal atom in nm is ................... (round off to 2 decimal places).
In an aqueous solution of Fe\(^{2+}\) ions with concentration of 10\(^{-4}\) M at 298 K and atmospheric pressure, the reduction potential of Fe in volt is ................... (round off to 2 decimal places).
Given: Standard reduction potential, \(E^{\circ}_{\text{Fe}^{2+}/\text{Fe}} = -0.44\) V
Faraday's constant, F = 96500 C per mole of electrons
Universal gas constant, R = 8.314 J mol\(^{-1}\)K\(^{-1}\)
Strain hardening behavior of an alloy is given by \( \sigma = 1100 \epsilon^{0.3} \), where \( \sigma \) and \( \epsilon \) are true stress and true strain, respectively. The alloy is cold drawn to an unknown amount of strain, followed by tensile testing. If the tensile test showed 10% reduction in area at maximum load, then the unknown amount of strain from prior cold work is ................... (round off to 2 decimal places).
Identify the INCORRECT statement(s)
A dislocation loop PQRSTU is on the (111) plane of a cubic single crystal with Burgers vector \( \vec{b} = \frac{a}{6}[\bar{1}\bar{2}1] \). The dislocation segments \(\vec{PU}\) and \(\vec{PQ}\) are parallel to \([0\bar{1}1]\) and \([1\bar{1}0]\) directions, respectively. The correct statement(s) is/are
Compared to top gating, the effect(s) of bottom gating in sand mold casting is/are
Choose the correct statement(s) in the context of fusion welding of austenitic stainless steel containing about 0.06 wt.% carbon.
Match the processes in Column I with the corresponding applications in Column II.
Column I
(P) Fused salt electrolysis
(Q) Carbothermal reduction
(R) Oxidation-refining
(S) Matte converting
Column II
(1) Ironmaking
(2) Aluminium extraction
(3) Copper extraction
(4) Steelmaking
Match the welding techniques in Column I with the most appropriate applications in Column II.
Column I
(P) Submerged arc welding
(Q) Electroslag welding
(R) Shielded metal arc welding
(S) Resistance spot welding
Column II
(1) Thick sections
(2) Surfacing and repair
(3) Thin sheets
(4) Flat position
Which of the following is/are the role(s) of coke in a blast furnace?
Match the components in Column I with corresponding manufacturing processes in Column II.
Column I
(P) Crank shaft
(Q) Machine bed
(R) Automobile brake pad
(S) Beverage can
Column II
(1) Sheet metal forming
(2) Forging
(3) Casting
(4) Powder metallurgy
Match Column I with Column II.
Column I
(P) Gallium arsenide
(Q) Barium titanate
(R) Iron - 4 wt.% silicon
(S) Yttrium-barium-copper oxide
Column II
(1) Superconductor
(2) Soft magnetic material
(3) Semiconductor
(4) Piezoelectric material
Match the transport processes in Column I with the relationships in Column II.
Column I
(P) Molecular momentum transport
(Q) Molecular mass transport
(R) Molecular energy transport
(S) Radiation energy transport
Column II
(1) Stefan-Boltzmann law
(2) Newton's law of viscosity
(3) Fick's law
(4) Fourier law
For supersonic O\(_2\) jet in basic oxygen furnace steelmaking, choose the correct combination from the following:
(1) Converging-diverging nozzle
(2) Diverging-converging nozzle
(3) O\(_2\) velocity greater than sound velocity at nozzle throat (Mach number > 1)
(4) O\(_2\) velocity equal to sound velocity at nozzle throat (Mach number = 1)
(5) Exit O\(_2\) jet pressure \(\ge\) atmospheric pressure
(6) Exit O\(_2\) jet pressure \(<\) atmospheric pressure
The non-destructive testing technique(s) for detecting internal defects in a steel component is/are
The condition(s) for high degree of mutual substitutional solid solubility for two metals is/are
A liquid of density 900 kg m\(^{-3}\) is flowing over a flat plate with a free stream velocity of 0.1 m s\(^{-1}\). The laminar boundary layer thickness at a distance of 0.2 m from the leading edge of the plate is 0.007 m. The viscosity of the liquid in centipoise is ................... (round off to 2 decimal places).
Given: 1 centipoise = 10\(^{-3}\) kg m\(^{-1}\)s\(^{-1}\)
The rate constant of a reaction at 400 K is three times the value at 300 K. The activation energy of the reaction in kJ mol\(^{-1}\) is ................... (round off to 1 decimal place).
Given: Universal gas constant, R = 8.314 J mol\(^{-1}\)K\(^{-1}\)
Which of the following is/are responsible for reducing the high cycle fatigue life of a component?
Match the defects in Column I with corresponding metal forming techniques in Column II.
Column I
(P) Cold shut
(Q) Zipper breaks
(R) Stretcher strains
(S) Center burst
Column II
(1) Rolling
(2) Sheet metal forming
(3) Drawing
(4) Forging
In rolling, the point on the surface of contact between roll and sheet where surface velocity of the roll is equal to velocity of the sheet is referred as
When cracks propagate in a brittle material, the following option(s) is/are correct
The most effective concentration step for sulfide ores is
The gas distribution in a blast furnace is controlled by the shape of