Metallurgical Engineering Gate Yearwise 



Metallurgical Engineering Gate 2025 Questions with Answer

Ques 27 GATE 2025

Front tension is applied during cold rolling of a thin metal sheet. Which of the following statements is/are TRUE?

A

The neutral point shifts towards the roll entrance.

B

The rolling load is decreased.

C

The neutral point shifts towards the roll exit.

D

The rolling load is increased.


(b) is the correct answer.

Ques 28 GATE 2025

Which of the following statements is/are CORRECT with respect to fusion welding and solid-state welding of metals and alloys?

A

Thermomechanically affected zone is found in the fusion welding of pure metals.

B

Partially melted zone is NOT found in the fusion welding of pure metal.

C

Diffusion bonding is one type of solid-state welding process.

D

Partially melted zone is found in the fusion welding of alloys with a large freezing range.


(c) is the correct answer.

Ques 29 GATE 2025

Which of the following welding processes does NOT / do NOT utilize consumable electrode?

A

Plasma arc welding

B

Gas metal arc welding

C

Shielded metal arc welding

D

Electron beam welding


(d) is the correct answer.

Ques 30 GATE 2025

A cylindrical Al alloy billet of 300 mm diameter is hot extruded to produce a cylindrical rod of 75 mm diameter at a constant true strain rate ( ) of 10s-1. The flow stress (σ) of the alloy at the extrusion temperature is given by σ=10(ε̇)0.3 MPa.
Assume the alloy is perfectly plastic and there is no temperature rise during the extrusion process.
The ideal plastic work of deformation per unit volume is ______ ×106 J m-3 (rounded off to one decimal place).


(0.3) is the correct answer.

Ques 31 GATE 2025

In optical microscopy, which one of the following combinations of wavelength (λ) and numerical aperture (NA) provides the best spatial resolution?

A

λ=400 nm and NA=1.0

B

λ=600 nm and NA=1.2

C

λ=400 nm and NA=1.2

D

λ=600 nm and NA=1.0


(c) is the correct answer.

Ques 32 GATE 2025

Match the phenomena in Column I with the typical observations in Column II.

Column IColumn II
P. Dynamic strain aging1. Grain boundary sliding
Q. Recrystallization2. Decrease in yield stress with a reversal of loading direction
R. Bauschinger effect3. Decrease in dislocation density
S. Superplasticity4. Serrations in stress-strain curve

A

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

B

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

C

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

D

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


(b) is the correct answer.

Ques 33 GATE 2025

For a component fabricated from an alloy A with plane strain fracture toughness, KIC=50 MPa m1/2, fracture was observed to take place at a crack length of 0.4 mm at a tensile service stress of σ.
If the same component is instead fabricated from alloy B with KIC=75 MPa m1/2, the crack length at which a similar crack geometry will result in fracture (under identical tensile service stress of σ) is ______ mm (rounded off to one decimal place).


(0.9) is the correct answer.

Ques 34 GATE 2025

In polycrystalline Ni, Nabarro-Herring diffusion creep was found to be the rate controlling creep mechanism at a certain temperature.
At that temperature, if the steady state strain rate is 10-8 s-1 at a stress of 10 MPa, the steady state strain rate of 10-9 s-1 will be obtained at a stress value of ______ MPa (in integer).
Assume that the same creep mechanism is rate controlling during the creep deformation.


(10) is the correct answer.

Ques 35 GATE 2025

A cylindrical specimen is subjected to plastic deformation in tension up to a uniform elongation of 10%. The final cross-sectional area of the gage section is found to be 20 mm2.
The initial cross-sectional area of the gage section is ______ mm2 (rounded off to an integer).


(22) is the correct answer.

Ques 36 GATE 2025

The diameter of spherical galena particles that have the same settling velocity as spherical quartz particles of diameter 25 μm (both settling in water) is ______ μm (rounded off to one decimal place).
Assume Stokes law of settling to be valid.
Given: Density of galena =7400 kg m-3, density of quartz =2600 kg m-3, density of water =1000 kg m-3


(29.2) is the correct answer.

Ques 37 GATE 2025

Match each crystal defect in Column I with the corresponding type in Column II

Column IColumn II
P. Edge dislocation1. Zero-dimensional defect
Q. Stacking fault2. One-dimensional defect
R. Frenkel defect3. Two-dimensional defect
S. Porosity4. Three-dimensional defect

A

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

B

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

C

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

D

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


(c) is the correct answer.

Ques 38 GATE 2025

The coordination number for an octahedral site in pure copper is

A

4

B

6

C

8

D

12


(b) is the correct answer.

Ques 39 GATE 2025

Two randomly oriented polycrystalline copper samples with average grain sizes of 10 μm (Sample A) and 100 μm (Sample B) were tested at room temperature.
Given:
EA= Young's modulus of Sample A
EB= Young's modulus of Sample B
YSA= Yield strength of Sample A
YSB= Yield strength of Sample B
Which one of the following statements is CORRECT?

A

EA>EB and YSA>YSB

B

EA=EB and YSAB

C

EA>EB and YSA=YSB

D

EA=EB and YSA>YSB


(d) is the correct answer.

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