Metallurgical Engineering Gate Yearwise 



Metallurgical Engineering Gate 2025 Questions with Answer

Ques 40 GATE 2025

In the Fe-C system, the invariant reaction Liquid + δ↔γ takes place at 1493°C. This type of reaction is called

A

eutectic

B

eutectoid

C

peritectic

D

monotectic


(c) is the correct answer.

Ques 41 GATE 2025

With reference to edge and screw dislocations, which of the following statements is/are CORRECT?

A

Both edge and screw dislocations can leave the slip plane by climb.

B

Burgers vector of a screw dislocation is parallel to its line vector.

C

Both edge and screw dislocations can leave the slip plane by cross-slip.

D

Strain energy per unit length of an edge dislocation is higher than that of a screw dislocation.


(b) is the correct answer.

Ques 42 GATE 2025

Which of the following statements is/are CORRECT with respect to the initial stage of GP zone formation in a precipitation hardenable Al - 4.5 wt.% Cu alloy?

A

GP zones are Cu-rich clusters.

B

GP zones are CuAl2 precipitates.

C

GP zones are incoherent with the matrix.

D

GP zones are coherent with the matrix.


(a) is the correct answer.

Ques 43 GATE 2025

Consider the phase diagram of a one component system given below. Vα, Vβ and VLiquid are the molar volumes of α, β, and liquid phases, respectively.
Which one of the following statements is TRUE?
Given: The change in molar enthalpies, ΔHα→β and ΔHβ→Liquid, are positive.

A

Vαβ and VβLiquid

B

Vα>Vβ and VβLiquid

C

Vαβ and Vβ>VLiquid

D

Vα>Vβ and Vβ>VLiquid


(a) is the correct answer.

Ques 44 GATE 2025

The following are the activation energies for diffusion of carbon and iron at 773 K in polycrystalline BCC iron:
P= Activation energy for diffusion of carbon in BCC iron through the lattice
Q= Activation energy for diffusion of iron in BCC iron through the lattice
R= Activation energy for diffusion of iron in BCC iron along the grain boundary
Which one of the following statements is CORRECT?

A

R<P<Q

B

R<Q<P

C

Q<P<R

D

P<R<Q


(a) is the correct answer.

Ques 45 GATE 2025

Which of the following statements is/are CORRECT when Ni is added as an alloying element to a low alloy steel?

A

Hardenability is increased AND the Ms temperature is lowered.

B

Hardenability is decreased AND the Ms temperature is lowered.

C

Hardenability is increased AND the Ms temperature is raised.

D

Hardenability is decreased AND the Ms temperature is raised.


(a) is the correct answer.

Ques 46 GATE 2025

X-ray diffraction using a monochromatic radiation of wavelength 0.154 nm is performed on powder samples of metal A (with FCC crystal structure) and metal B (with BCC crystal structure).
If the first peak in both the cases occurs at a Bragg angle θ=20°, then the value of lattice parameter of metal A / lattice parameter of metal B is ______ (rounded off to two decimal places).


(1.03) is the correct answer.

Ques 47 GATE 2025

An intrinsic semiconductor has conductivity of 100 Ω-1m-1 at 300 K and 300 Ω-1m-1 at 500 K.
The band gap of the semiconductor is ______ eV (rounded off to two decimal places).
Given: Boltzmann constant kB=8.6×10-5 eV K-1


(0.50) is the correct answer.

Ques 48 GATE 2025

A single crystal BCC metal with a lattice parameter a=0.4 nm is subjected to deformation at a shear strain rate of 0.001 s-1.
If the average mobile dislocation density in the single crystal is 1010 m-2, the average dislocation velocity is ______ ×10-3 m s-1 (rounded off to two decimal places).
Given: Burgers vector b=(a/2)⟨111⟩


(0.80) is the correct answer.

Ques 49 GATE 2025

Hot metal from a blast furnace is treated with mill scale prior to oxygen steelmaking for

A

dephosphorization

B

decarburization

C

desulphurization

D

desiliconization


(d) is the correct answer.

Ques 50 GATE 2025

Consider the following gas-phase reaction: 2SO2+O2↔2SO3
If the enthalpy of reaction is negative, which one of the following conditions promotes a higher equilibrium concentration of SO3?

A

Higher pressure and higher temperature

B

Higher pressure and lower temperature

C

Lower pressure and higher temperature

D

Lower pressure and lower temperature


(b) is the correct answer.

Ques 51 GATE 2025

Which one of the following slag components is responsible for the oxidizing power of steelmaking slags?

A

SiO2

B

CaO

C

MgO

D

FeO


(d) is the correct answer.

Ques 52 GATE 2025

Match the following elements in Column I with their respective ores in Column II.

Column IColumn II
P. Al1. Rutile
Q. Fe2. Hematite
R. Ti3. Chalcopyrite
S. Cu4. Bauxite

A

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

B

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

C

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

D

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


(d) is the correct answer.

Unique Visitor Count

Total Unique Visitors

Loading......

Question Options

Contributed by: