Metallurgical Engineering Gate Yearwise 



Metallurgical Engineering Gate 2026 Questions with Answer

Ques 27 GATE 2026

A cylindrical single crystal of copper having 10 mm diameter is deformed under a uniaxial tensile load of 2200 N. The angle between the normal to the slip plane and the tensile loading axis is α, whereas, the angle between slip direction and the tensile axis is β. The slip direction is in the plane defined by the stress axis and the normal to the slip plane.
If α = β, the critical resolved shear stress (CRSS), rounded off to one decimal place, is ________ MPa.


(14.0) is the correct answer.

Ques 28 GATE 2026

For plane strain fracture toughness (KIc) testing of Maraging steel, the minimum thickness to achieve valid KIc is (answer in integer) ______________ mm.
(Given: KIc = 90 MPa√m and yield stress = 900 MPa)


(25) is the correct answer.

Ques 29 GATE 2026

Deformation mechanism map of a given material is used for determining which one of the following properties?

A

Fatigue strength

B

Creep rate

C

Tensile strength

D

Impact toughness


(b) is the correct answer.

Ques 30 GATE 2026

Residual stress present in a material can be determined by which one of the following techniques:

A

X-ray Diffraction (XRD)

B

Tensile Testing

C

Thermo-Gravimetric Analysis (TGA)

D

Optical Microscopy


(a) is the correct answer.

Ques 31 GATE 2026

Match the concepts listed in Column I with the associated terms listed in Column II

Column I Column II
(P) Paris Law (1) Creep
(Q) Schmid Factor (2) Fatigue
(R) Larson - Miller Parameter (3) Dynamic Strain Aging
(S) Portevin - Le Chatelier Effect (4) Critical Resolved Shear Stress

A

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

B

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

C

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

D

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


(p-2, q-4, r-1, s-3) is the correct answer.

Ques 32 GATE 2026

Match the descriptions listed in Column I with the corresponding non-destructive testing methods listed in Column II:

Column I Column II
(P) Internal flaws in railroad wheel (1) Ultrasonic
(Q) In-service monitoring of crack (2) Radiography
(R) Inclusion in mild steel (3) Dye Penetrant
(S) Surface crack in Al-based alloy (4) Acoustic Emission

A

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

B

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

C

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

D

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


(a) is the correct answer.

Ques 33 GATE 2026

A 50 mm flat aluminium plate is reduced in thickness to 25 mm in a single pass cold-rolling operation with the rolling diameter of 1250 mm. For this case, the minimum required coefficient of friction between the plate and the roll (rounded off to two decimal places) is ___________.


(0.20) is the correct answer.

Ques 34 GATE 2026

Match the type of defects in Column I with the corresponding metal manufacturing processes listed in Column II:

Column I Column II
(P) Edge Cracking (1) Casting
(Q) Flashline Cracking (2) Forging
(R) Chevron Cracking (3) Rolling
(S) Cracked Core (4) Extrusion

A

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

B

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

C

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

D

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


(d) is the correct answer.

Ques 35 GATE 2026

A metal having body-centered cubic structure is analyzed through X-ray diffraction using monochromatic X-ray of wavelength 0.154 nm. The diffraction angle (2θ) corresponding to {2 0 0} plane is 60° (for first order reflection).
The atomic radius of this element (rounded off to three decimal places) is _______________nm.


(0.133) is the correct answer.

Ques 36 GATE 2026

The lattice parameter of Ni (face-centered cubic) is 0.35 nm and its shear modulus is 76 GPa. The strain energy per unit length of a screw dislocation in Ni crystal (rounded off to two decimal places) is _________ × 10-9 J/m.


(2.33) is the correct answer.

Ques 37 GATE 2026

A given volume of liquid is undercooled just below the melting temperature to form a spherical solid nucleus (consider homogeneous nucleation). The Gibbs free energy of solidification (ΔGv) is (− 0.5 × 108) J/m3. The solid-liquid interfacial energy (γ) is isotropic and its value is 0.1 J/m2.
The critical nucleus size for a stable nucleus is __________ nm (answer in integer).


(4) is the correct answer.

Ques 38 GATE 2026

During carburizing of a steel, the surface concentration is kept constant at 1.4 wt.% carbon. Diffusivity of carbon for the steel at 950 °C is 6.25 × 10-11 m2/s. At 950 °C, the time required to carburize the steel with an initial composition of 0.2 wt.% carbon to 0.8859 wt.% carbon at a depth of 0.2 mm is ______________ seconds (approximate to the nearest integer).
Use the nearest value of the error function from the table given below for your calculation.

z erf(z)
0.3 0.3268
0.4 0.4284
0.5 0.5205


(1000) is the correct answer.

Ques 39 GATE 2026

During metallography, Nital is the most commonly used for etching _____________.

A

Bronze

B

Brass

C

Mild Steel

D

Aluminium


(c) is the correct answer.

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