GATE MT year:2025 PYQs & Answers — Page 5

Questions 41–50 of 65. Imported answers require independent review unless marked reviewed.

Which one of the following matrices is orthogonal?

Your answerChoose one option.

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Match the casting defects in Column I with the characteristic features in Column II.

Column I

P. Misrun Q. Expansion scab R. Pin holes S. Hot tearing

Column II

Penetration of liquid metal behind surface layer of sand moulds

Metal solidifies prematurely in the mould and some sections of the casting are not filled

Cracking because of restraint to contraction in certain areas of the casting during solidification and cooling to room temperature

Evolution of gases during solidification resulting in porosity

Your answerChoose one option.

P – 2, Q – 3, R – 4, S – 1

P – 1, Q – 3, R – 2, S – 4

P – 1, Q – 2, R – 4, S – 3

P – 2, Q – 1, R – 4, S – 3

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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?

Your answerChoose one option.

R < P < Q

R < Q < P

Q < P < R

P < R < Q

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

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

The neutral point shifts towards the roll entrance.

The roll load is decreased.

The neutral point shifts towards the roll exit.

The rolling load is increased.

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

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

Hardenability is increased AND the

temperature is lowered.

Hardenability is decreased AND the

temperature is lowered.

Hardenability is increased AND the

temperature is raised.

Hardenability is decreased AND the

temperature is raised.

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

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

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

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

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

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

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

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

Plasma arc welding

Gas metal arc welding

Shielded metal arc welding

Electron beam welding

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For a two-dimensional field described by

, the magnitude of its gradient at the point

is _____ (rounded off to two decimal places).

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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

, then the value of

= _____ (rounded off to two decimal places).

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The excess molar Gibbs free energy of a solution of element A and B at 1000 K is given by

, where

and

are mole fractions of A and B, respectively.

The activity of B in a solution of A and B containing 40 mol% of B at 1000 K is _____ (rounded off to two decimal places).

Given: Ideal gas constant R = 8.314 J mol

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GATE MT year:2025 PYQs

Question 41

Question 42

Question 43

Question 44

Question 45

Question 46

Question 47

Question 48

Question 49

Question 50