GATE MT year:2024 PYQs & Answers — Page 3

Questions 21–30 of 65. Imported answers require independent review unless marked reviewed.

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

Your answerChoose one option.

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

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

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

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

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Which one of the following schemes represents the variation of the rate of nucleation of solid from a pure liquid metal as a function of undercooling (

, where

and

are the freezing temperature and the liquid temperature, respectively)?

Your answerChoose one option.

Diagram for Metallurgical Engineering question 22

Diagram for Metallurgical Engineering question 22 (figure 2)

Diagram for Metallurgical Engineering question 22 (figure 3)

Diagram for Metallurgical Engineering question 22 (figure 4)

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

Your answerChoose one option.

Face centered cubic to body centered cubic

Face centered cubic to body centered tetragonal

Body centered cubic to body centered tetragonal

Body centered tetragonal to face centered cubic

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The figure shows a dislocation loop (shown by the solid circle), whose Burgers vector is

(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.

Diagram for Metallurgical Engineering question 24

Your answerChoose one option.

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

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

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

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

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

Your answerChoose one option.

P – 1, Q – 2, R – 3, S – 4

P – 4, Q – 1, R – 2, S – 3

P – 3, Q – 1, R – 2, S – 4

P – 3, Q – 4, R – 2, S – 1

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

Your answerChoose one option.

P – 3, Q – 1, R – 2, S – 4

P – 3, Q – 4, R – 2, S – 1

P – 2, Q – 4, R – 3, S – 1

P – 1, Q – 3, R – 2, S – 4

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

Your answerChoose one option.

Pore shrinkage

Dynamic recrystallization

Lattice diffusion

Grain boundary diffusion

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Which of the following statements is/are correct for a square matrix

with real number entries?

denotes the transpose of

and

denotes the inverse of

Your answerSelect all correct options. You can choose more than one.

is symmetric if

is skew-symmetric if

is orthogonal, then

is orthogonal, then its determinant is zero.

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

Your answerSelect all correct options. You can choose more than one.

Entropy maximization

Entropy minimization

Maximization of Gibbs free energy

Minimization of Gibbs free energy

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Which of the following

reflections is/are allowed in X-ray diffraction pattern of a crystal with face centered cubic lattice?

Your answerSelect all correct options. You can choose more than one.

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GATE MT year:2024 PYQs

Question 21

Question 22

Question 23

Question 24

Question 25

Question 26

Question 27

Question 28

Question 29

Question 30