GATE MT topic:materials-engineering PYQs & Answers — Page 60

Questions 591–600 of 650. Imported answers require independent review unless marked reviewed.

The rate of dissolution of Al particles in liquid steel is proportional to concentration difference (ΔC). ΔC is defined by: (Given: (i) C_b = bulk concentration of dissolved Al in liquid steel, (ii) C* = saturation concentration of Al in liquid steel at the given temperature, (iii) C_m = Density of Al/Atomic weight of Al.)

Your answerChoose one option.

C* − C_b

C_b − C_m

C* − C_m

√(C* C_m) − C_b

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Hydrogen dissolves in Pd by the reaction H₂ = 2 [H]. At 300°C and P_H₂ = 1 atm, the solubility of hydrogen in Pd is 1.64 × 10⁴ mm³ (STP) per kg of Pd. At 300°C and P_H₂ = 0.09 atm, the solubility of hydrogen in Pd in mm³ (STP) per kg of Pd is __________ (answer up to one decimal place)

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The sieve analysis of ground quartz particles is given in the table below:

Sieve size (mm)	Mass fraction of ground product retained on each sieve
4.76	0.0
3.36	0.2
2.38	0.4
1.68	0.3
1.19	0.08
< 1.19	0.02

The cumulative mass fraction of particles of size less than 1.68 mm is __________ (answer up to two decimal places)

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The sequence of precipitation to reach stable equilibrium during aging of Al-4.5 wt.% Cu alloy is:

Your answerChoose one option.

GP zone → θ′ → θ″ → θ

GP zone → θ″ → θ′ → θ

GP zone → θ → θ″ → θ′

GP zone → θ″ → θ → θ′

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Tungsten powder is pressed at 150 MPa to a green density of 55%. After sintering, the compact attains 86.5% of its theoretical density. Assuming uniform shrinkage, the linear shrinkage (in %) is __________ (answer up to two decimal places)

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For a FCC metal, radius of the largest sphere that can fit in the tetrahedral void (in nm) is __________ (answer up to three decimal places)

(Given: lattice parameter = 0.401 nm)

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In an iron-carbon alloy containing 0.35 wt.% C, the mass fraction of pearlite just below the eutectoid temperature is __________ (answer up to two decimal places)

(Given: eutectoid composition = 0.8 wt.% carbon; and carbon content in ferrite is 0.025 wt.%)

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A cubic metal has a density of 1900 kg.m⁻³, lattice parameter of 0.4 nm and atomic weight of 183. The effective number of atoms in a unit cell of this metal is __________

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Primary mechanisms of accommodating plastic strain at low temperatures in crystalline metals are:

Your answerChoose one option.

twinning and dislocation-slip

dislocation-climb and dislocation-slip

dislocation-slip and diffusion

viscous-flow and dislocation-slip

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Spherical α phase particles are depicted in the hypothetical microstructure section shown below. Using the superimposed grid on the microstructure, the estimated volume fraction of α phase is __________ (answer up to three decimal places)

Diagram for Metallurgical Engineering question 15

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GATE MT topic:materials-engineering PYQs

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Question 15