GATE MT topic:metallurgy PYQs & Answers — Page 12

Questions 111–120 of 650. Imported answers require independent review unless marked reviewed.

Topic practice 650 questionsPage 12 of 65

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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Molten steel at 1900 K having dissolved hydrogen needs to be vacuum degassed.

The equilibrium partial pressure of hydrogen to be maintained to achieve 1 ppm (mass basis) of dissolved hydrogen is _____ Torr (rounded off to two decimal places).

Given: For the hydrogen dissolution reaction in molten steel (½ H

(g) = [H]), the equilibrium constant (expressed in terms of ppm of dissolved H) is:

1 atm = 760 Torr

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The value of

is _____ (in integer).

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Consider the following reactions and their standard Gibbs free energies (in J):

Fe(s) +

(g) ⇌ FeO(s)

2 H

(g) + O

(g) ⇌ 2 H

O(g)

Assuming Fe and FeO to be pure and no solubility of gases in the solids, the value of

required to reduce solid FeO to solid Fe at 1000 K is _____ (rounded off to two decimal places).

Given: Ideal gas constant R = 8.314 J mol

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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

, density of quartz = 2600 kg m

, density of water = 1000 kg m

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Consider the following cell reaction:

Mg + Cd

⇌ Mg

+ Cd

The standard Gibbs free energy change for the reaction is _____ kJ (rounded off to an integer).

Given: Standard oxidation potentials for the reactions with respect to standard hydrogen electrode are:

Mg ⇌ Mg

+ 2e

E° = 2.37 V

Cd ⇌ Cd

+ 2e

E° = 0.403 V

Faraday’s constant = 96500 C mol

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GATE MT topic:metallurgy PYQs

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