GATE MT year:2020 PYQs & Answers — Page 5

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

has ______ at

Your answerChoose one option.

a local minimum

a local maximum

a point of inflection

a non-zero slope

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Match the processes in Column I with the most appropriate mechanisms in Column II.

Column I (P) Blast furnace iron making process (Q) Hall-Heroult's process (R) Basic oxygen furnace steel making process (S) Kroll's process

Column II

Metallothermic reduction

Oxidation

Carbothermic reduction

Fused salt electrolysis

Your answerChoose one option.

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

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

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

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

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Match the reactors in Column I with the corresponding products in Column II.

Column I (P) COREX (Q) MIDREX (R) Flash smelting reactor (S) Submerged arc furnace

Column II

Sponge iron

Copper matte

Hot metal or pig iron

Ferrochrome

Your answerChoose one option.

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

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

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

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

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X-ray diffraction pattern from an element metal with a FCC crystal structure shows the first peak at a Bragg angle

. The lattice parameter of this metal is ______ nm.

Given, wavelength of the X-ray used is 0.1543 nm.

Your answerChoose one option.

0.185

0.262

0.320

0.370

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Match the materials in Column I with their common applications in Column II.

Column I (P) Gray iron (Q) Ductile iron (R) Zirconium alloy (S) Beryllium-Copper alloy

Column II

Cladding for uranium fuel in nuclear reactor

Base structure of heavy machines

Valves and pump bodies

Jet aircraft landing gear bearings

Your answerChoose one option.

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

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

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

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

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The Mg-Sn phase diagram exhibits two eutectics on either side of the high melting intermetallic line compound, Mg

Sn, as given below.

At 561°C: L (36.9 wt.% Sn) → α (14.48 wt.% Sn) + Mg

At 203°C: L (97.87 wt.% Sn) → β-Sn (almost 100 wt.% Sn) + Mg

After the eutectic reaction has gone to completion and equilibrium has been attained at a temperature just below 561°C, the amount of eutectic constituent present in the alloy, Mg-50 wt.% Sn, is approximately ______ (in wt.%).

Given, atomic weight of Sn is 118.7 and Mg is 24.3

Your answerChoose one option.

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Determine the correctness or otherwise of the following Assertion [a] and the Reason [r]

Assertion [a]: Low-alloy steels used for medium-temperature creep resistance often have additions of strong carbide-forming elements.

Reason [r]: During creep deformation, the particles with higher misfit with the matrix, lose coherency.

Your answerChoose one option.

Both [a] and [r] are true and [r] is the correct reason for [a].

Both [a] and [r] are true but [r] is not the correct reason for [a].

Both [a] and [r] are false.

[a] is true but [r] is false.

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Determine the correctness or otherwise of the following Assertion [a] and the Reason [r]

Assertion [a]: The rate of homogenization in a dilute substitutional solid solution of B in A is controlled by the diffusivity of B.

Reason [r]: Atomic migration cannot occur along dislocations and grain boundaries.

Your answerChoose one option.

Both [a] and [r] are true and [r] is the correct reason for [a]

Both [a] and [r] are true but [r] is not the correct reason for [a]

Both [a] and [r] are false

[a] is true but [r] is false

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Match the elements in Column I with their electronic behavior given in Column II.

Column I: (P) Copper (Q) Iron (R) Mercury (S) Silicon

Column II:

Ferromagnetic

Superconducting

Semiconducting

Diamagnetic

Your answerChoose one option.

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

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

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

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

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Radius of the largest interstitial atom that can be accommodated in an octahedral void in BCC iron without distorting the lattice is ______ nm (round off to three decimal places).

Assume hard sphere model and radius of Fe atom as 0.124 nm.

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GATE MT year:2020 PYQs

Question 31

Question 32

Question 33

Question 34

Question 35

Question 36

Question 37

Question 38

Question 39

Question 40