Metallurgical Engineering Gate Yearwise 



Metallurgical Engineering Gate 2024 Questions with Answer

Ques 27 GATE 2024

Which one of the following is the correct statement about the industrial production of aluminium from pure dry alumina by Hall-Héroult electrolytic reduction?

A

Cell is operated at a high voltage (220 to 240 V) with a very low current density.

B

Cell is operated at a low voltage (5 to 7 V) with a very low current density.

C

Cell is operated at a high voltage (220 to 240 V) with a very high current density.

D

Cell is operated at a low voltage (5 to 7 V) with a very high current density.



Ques 28 GATE 2024

Which one of the following schematics represents the variation of the rate of nucleation of solid from a pure liquid metal as a function of undercooling (ΔT = Tm - T, where Tm and T are the freezing temperature and the liquid temperature, respectively)?

A

B

C

D



Ques 29 GATE 2024

Which one of the following crystal structure changes occurs during the transformation of mild steel from austenite to martensite?

A

Face centered cubic to body centered cubic

B

Face centered cubic to body centered tetragonal

C

Body centered cubic to body centered tetragonal

D

Body centered tetragonal to face centered cubic



Ques 30 GATE 2024

The figure shows a dislocation loop (shown by the solid circle), whose Burgers vector is b (shown by the horizontal arrow inside the dislocation loop). Identify the nature of the dislocation segment at locations p, q and r.
The dash-dot lines show the horizontal and vertical diameters of the loop, and the arrow along the dislocation loop indicates the line vector.

A

p: pure edge, q: mixed, r: pure screw

B

p: pure edge, q: pure screw, r: pure edge

C

p: pure screw, q: mixed, r: pure screw

D

p: pure screw, q: pure edge, r: pure screw



Ques 31 GATE 2024

Match the concepts listed in Column I with the phenomena listed in Column II.

A

P-1, Q=2, R-3, S-4

B

P-4. Q-1 R-2 S-3

C

P-3. Q-1, R-2, S-4

D

P-3. Q-4 R-2. S-1



Ques 32 GATE 2024

Match the defects listed in Column I with the associated manufacturing processes listed in Column II.

A

P-3, Q-1, R-2, S-4

B

P-3, Q-4. R-2, S-1

C

P-2, Q-4, R-3, S-1

D

P-1, Q-3, R-2. S-4



Ques 33 GATE 2024

Which one of the following mechanisms is NOT involved in the sintering of a green compact? Assume that sintering is performed without application of pressure.

A

Surface diffusion

B

Dynamic recrystallization

C

Lattice diffusion

D

Grain boundary diffusion



Ques 34 GATE 2024

Which of the following is/are criterion/criteria for equilibrium of an isolated system at constant temperature and pressure?

A

Minimization of Helmholtz free energy.

B

Maximization of Helmholtz free energy.

C

Minimization of Gibbs free energy.

D

Maximization of Gibbs free energy.



Ques 35 GATE 2024

Which of the following (h k l) reflections is/are allowed in an X-ray diffraction pattern of a crystal with face centered cubic lattice?

A

(0 0 1)

B

(0 1 1)

C

(1 1 1)

D

(0 0 2)



Ques 36 GATE 2024

The interaction energy U between two atoms is given by the following equation:
U = -1.6/r6 + 51.2/r12
where U is the interaction energy in eV and r is the interatomic distance in Å. The equilibrium bond-length between the atoms is _______ Å. (Round off to the nearest integer)


2 is the correct answer.


Ques 37 GATE 2024

For a solid embryo in contact with a perfectly flat mould wall as shown in the schematic, the wetting angle θ is _______ degrees.

(Round off to one decimal place). Given: Surface tension between liquid and mould wall = 0.35 J⋅m-2 Surface tension between solid and mould wall = 0.02 J⋅m-2 Surface tension between liquid and solid = 0.40 J⋅m-2


46.6 is the correct answer.


Ques 38 GATE 2024

A single crystal is oriented such that the normal to the slip plane makes an angle of 60° with the tensile axis. If the slip direction makes an angle of 45° with respect to the tensile axis and the critical resolved shear stress for slip is 2 MPa, then the tensile stress at which plastic deformation commences is _______ MPa. (Round off to one decimal place)


8.0 is the correct answer.


Ques 39 GATE 2024

The extrusion force required to extrude an aluminum rod of cross-sectional area of 150 mm2 to cross-sectional area of 50 mm2 is _______ N. (Round off to the nearest integer)
Assume that the extrusion constant, which accounts for the flow stress, strain hardening, friction and inhomogeneous deformation, is equal to 2 MPa.


300000 is the correct answer.


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