Metallurgical Engineering Gate Yearwise 



Metallurgical Engineering Gate 2023 Questions with Answer

Ques 27 GATE 2023

Diamond has low _______.

A

electrical conductivity

B

modulus of elasticity

C

hardness

D

thermal conductivity


(a) is the correct answer.

Ques 28 GATE 2023

For self-diffusion in polycrystalline copper with a lattice diffusion coefficient DL, grain boundary diffusion coefficient DGB, and surface diffusion coefficient DS, the correct relationship is _______.

A

DS > DGB > DL

B

DL > DS > DGB

C

DGB > DS > DL

D

DGB = DS = DL


(a) is the correct answer.

Ques 29 GATE 2023

Magnitude of Burgers vector of the dislocation resulting from reaction of dislocations with Burgers vectors a/2[101] and a/2[01̅1̅] is _______.

A

a/√2

B

√2 a

C

a/2

D

2a


(b) is the correct answer.

Ques 30 GATE 2023

The mechanism of creep for a single crystal as depicted in the schematic is _______.

A

Nabarro-Herring creep

B

Grain boundary sliding

C

Dislocation creep

D

Coble creep


(a) is the correct answer.

Ques 31 GATE 2023

Match the defects in Column I with corresponding metal forming techniques in Column II.

A

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

B

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

C

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

D

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


(a) is the correct answer.

Ques 32 GATE 2023

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 _______.

A

no-slip point

B

no-stick point

C

maximum slip point

D

maximum stick point


(a) is the correct answer.

Ques 33 GATE 2023

When cracks propagate in a brittle material, the following option(s) is/are correct _______.

A

elastic strain energy decreases

B

surface energy increases

C

surface energy decreases

D

elastic strain energy increases


(a,b) is the correct answer.

Ques 34 GATE 2023

Which of the following is/are responsible for reducing the high cycle fatigue life of a component?

A

increasing the mean stress at constant amplitude

B

increasing the surface roughness

C

employing shot peening

D

absence of sharp corners in the component


(a,b) is the correct answer.

Ques 35 GATE 2023

The non-destructive testing technique(s) for detecting internal defects in a steel component is/are _______.

A

X-ray tomography

B

Ultrasonic technique

C

Gamma radiography

D

Dye penetrant technique


(a,b,c) is the correct answer.

Ques 36 GATE 2023

The condition(s) for high degree of mutual substitutional solid solubility for two metals is/are _______.

A

metals should have same valence

B

metals should have same crystal structure

C

the difference in atomic size of metals should be less than 15%

D

the difference in electronegativity of metals should be large


(a,b,c) is the correct answer.

Ques 37 GATE 2023

Maximum number of phases that can be in equilibrium for a 5-component system at constant temperature and pressure is _______ (in integer).


(6) is the correct answer.

Ques 38 GATE 2023

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


(1.58) is the correct answer.

Ques 39 GATE 2023

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


(18.3) is the correct answer.

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