GATE MT discipline:chemistry-and-materials PYQs & Answers — Page 64

Questions 631–640 of 650. Imported answers require independent review unless marked reviewed.

Arrange the magnetic moment of neighboring atoms in a one-dimensional lattice in Group-I to the corresponding magnetic material in Group-II

Group-I [P] Random [Q] Parallel [R] Antiparallel [S] Antiparallel and unequal

Diagram for Metallurgical Engineering question 46

Group-II [1] Antiferromagnetic [2] Ferrimagnetic [3] Paramagnetic [4] Ferromagnetic

Your answerChoose one option.

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

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

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

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

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For an intrinsic semiconductor, the room temperature electrical conductivity is 10⁻⁶ Ω⁻¹ m⁻¹. If the electron and hole mobilities are 0.75 and 0.06 m² V⁻¹ s⁻¹ respectively, the intrinsic carrier concentration (per m³) at room temperature is:

Your answerChoose one option.

5.1×10¹²

7.7×10¹²

8.3×10¹²

1.1×10¹⁴

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A steel component is subjected to fatigue loading: σ (maximum) = 200 MPa, σ (minimum) = 0. The component has an initial crack length of 1 mm. Propagation of crack is governed by

where, the crack length a is in meters, N is the number of cycles and ΔK is in MPa·m¹ᐟ². The length of the crack (in m) after one million cycles will be ________ (answer up to three decimal places)

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During heat treatment of a cold worked metal, recrystallization is 20% complete after 100 s. The transformation (in %) in 400 s is ________ (answer up to two decimal places)

(Assume Avrami exponent, n = 2)

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At low temperature, two parallel edge dislocations lying on parallel slip planes are shown in different configurations below.

Diagram for Metallurgical Engineering question 50

Match the following:

Configuration [P] Configuration [Q] Configuration [R] Configuration [S]

[1] Dislocations repel [2] Dislocations attract [3] Dislocations are in stable equilibrium [4] Dislocations are in unstable equilibrium

Your answerChoose one option.

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

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

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

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

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A single crystal of an FCC metal is subjected to a sufficiently large tensile stress along the [1̄10] direction to activate some of the slip systems. Which one of the following slip systems will be activated:

Your answerChoose one option.

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A perfectly elastic-plastic material has a yield stress of 450 MPa and fractures at a strain of 0.45. The ratio of resilience to toughness for this material is ________ (answer up to three decimal places)

(Given the Young’s modulus E = 4.5 GPa)

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Total time for solidification of a cubic casting of dimensions 5.0 cm × 5.0 cm × 5.0 cm is 1.6 min. A cylindrical riser with diameter to height ratio 0.5 is required so that the time for solidification of riser is 3.2 min. Applying Chvorinov’s rule, the height of the riser (in cm) is ________ (answer up to two decimal places)

(Assume that exponent (n) in Chvorinov’s equation is 2)

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A 250 mm thick slab of a nickel alloy is subjected to cold rolling using a roll of diameter 450 mm. If the angle of bite during rolling is 10°, the maximum possible reduction (in mm) during rolling is ________ (answer up to two decimal places)

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W-Ni compact is prepared by liquid phase sintering at 1500°C. If the size of tungsten grains is 40 μm and the interfacial tungsten-tungsten and tungsten-nickel energies are 0.52 and 0.30 J.m⁻² respectively, the predicted average neck size (in μm) of sintered tungsten grain is:

(Melting points of tungsten and nickel are 3410°C and 1453°C, respectively)

Your answerChoose one option.

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GATE MT discipline:chemistry-and-materials PYQs

Question 46

Question 47

Question 48

Question 49

Question 50

Question 51

Question 52

Question 53

Question 54

Question 55