GATE MT Physical Metallurgy - Askmemetallurgy

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Askmemetallurgy Official

Asked: February 25, 2022In: Physical Metallurgy & Heat treatment

GATE MT 2022 Q47

The equilibrium microstructure of an alloy A-B consists of two phases α and β in the molar proportion 2:1. If the overall composition of the alloy is 70 mol% B and the composition of β is 90 mol% B, the ...Read more

The equilibrium microstructure of an alloy A-B consists of two phases α and β in the molar proportion 2:1. If the overall composition of the alloy is 70 mol% B and the composition of β is 90 mol% B, the composition of α is _______(in mol% B) (round off to the nearest integer).

Askmemetallurgy Official

Asked: February 25, 2022In: Physical Metallurgy & Heat treatment

GATE MT 2022 Q27. Which of the following statement(s) is(are) TRUE about black body radiation?

Askmemetallurgy Official

Asked: February 25, 2022In: Physical Metallurgy & Heat treatment

GATE MT 2022 Q24. Figures P, Q, R and S schematically show the atomic dipole moments in the absence of external magnetic field. Which one of the following is the correct mapping of nature of magnetism to atomic dipole moments?

Poll Results

0% (A) P- Diamagnetism, Q-Antiferromagnetism, R - Paramagnetism, S - Ferromagnetism

100%(B) P – Ferromagnetism, Q - Antiferromagnetism, R – Diamagnetism, S - Paramagnetism ( 1 voter )

0%(C) P – Paramagnetism, Q – Ferromagnetism, R – Diamagnetism, S - Antiferromagnetism

0%(D) P – Ferromagnetism, Q – Diamagnetism, R – Antiferromagnetism, S- Paramagnetism

Based On 1 Vote

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Askmemetallurgy Official

Asked: February 25, 2022In: Physical Metallurgy & Heat treatment

GATE MT 2022 Q20. While designing a material for high temperature application, which of the following characteristic(s)/attribute(s) is(are) desirable for achieving better creep resistance?

Poll Results

10% (A) Fine grain size ( 1 voter )

40% (B) FCC crystal structure ( 4 voters )

30% (C) High melting point ( 3 voters )

20% (D) Cold worked microstructure ( 2 voters )

Based On 10 Votes

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Askmemetallurgy Official

Asked: February 25, 2022In: Physical Metallurgy & Heat treatment

GATE MT 2022 Q16. With increase in carbon content (up to 2 mass%) in Fe-C alloy, which one of the following statements is correct with respect to the lattice parameters (c and a) of BCT martensite?

Poll Results

No votes. Be the first one to vote.

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Askmemetallurgy Official

Asked: February 24, 2022In: Physical Metallurgy & Heat treatment

GATE MT 2022 Q9. Match the nature of bonding (Column I) with material (Column II)

Poll Results

0% (A) P – 4, Q – 3, R – 2, S – 1

0% (B) P – 2, Q – 1, R – 3, S – 4

0% (C) P – 3, Q – 1, R – 4, S – 2

100% (D) P – 3, Q – 1, R – 2, S – 4 ( 4 voters )

Based On 4 Votes

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GATE MT 2022 Q9. Match the nature of bonding (Column I) with material (Column II)

Askmemetallurgy Official

Asked: February 24, 2022In: DT & NDT

GATE MT 2022 Q5

Which one of the following Non Destructive Testing (NDT) techniques CANNOT be used to identify volume defects in the interior of a casting?

Which one of the following Non Destructive Testing (NDT) techniques CANNOT be used to identify volume defects in the interior of a casting?

Askmemetallurgy Official

Asked: February 24, 2022In: DT & NDT

GATE MT 2022 Q4

Poll Results

50% (A) 111, 200, 220, 311 ( 1 voter )

0% (B) 110, 200, 211, 220

50% (B) 110, 200, 211, 220 ( 1 voter )

0% (D) 111, 200, 311, 220

Based On 2 Votes

The sequence of peaks corresponding to the planes (in the order of increasing 2𝜃) observed in the X-ray

Askmemetallurgy Official

Asked: March 31, 2021In: Physical Metallurgy & Heat treatment

GATE MT 2021 Q55. A solid sphere (0.5 m radius) is enclosed within a larger hollow sphere (1 m radius), as shown in figure. The radiation exchange takes place between the outer surface (surface 1) of the small sphere and the inner surface (surface 2) of the bigger sphere. The value of the view factor, F22 is: (round off to 2 decimal places). Given: View factor (Fij) is the fraction of the radiation leaving surface i that is intercepted by surface j.

2021 55

Askmemetallurgy Official

Asked: March 31, 2021In: Physical Metallurgy & Heat treatment

GATE MT 2021 Q54. Nickel undergoes isothermal oxidation at 800 K for a duration of 400 s resulting in a weight gain of 2 mg cm-2. The weight gain (mg cm-2) after a duration of 1600 s is: (round off to nearest integer).Assume: Weight gain is proportional to square root of time.

Askmemetallurgy Official

Asked: March 31, 2021In: Physical Metallurgy & Heat treatment

GATE MT 2021 Q53. The radius of an interstitial atom which just fits (without distorting the structure) inside an octahedral void of a bcc-iron crystal (in nm) is: (round off to 3 decimal places).Assume the radius of Fe atom to be 0.124 nm.

Askmemetallurgy Official

Asked: March 31, 2021In: Physical Metallurgy & Heat treatment

GATE MT 2021 Q51. A thick steel plate containing 0.1 wt.% C is carburized at 950 °C. The plate’s surface carbon concentration is maintained at 1.1 wt.% C. After 9 hours, the depth (in mm) below the surface at which the carbon concentration is 0.6 wt.% C will be: (round off to 2 decimal places).Given: Diffusivity of carbon in γ-Fe at 950 °C = 1.6 x 10-11 m2 s-1 Error function table:

2021 51

Askmemetallurgy Official

Asked: March 31, 2021In: Physical Metallurgy & Heat treatment

GATE MT 2021 Q47. In a material, a shear stress of 100 MPa is required to bow a dislocation line between precipitates with a spacing of 0.2 µm. If the spacing between the precipitates is increased to 0.5 µm, the shear stress (in MPa) to bow the dislocation would be: (round off to nearest integer).

Askmemetallurgy Official

Asked: March 31, 2021In: Physical Metallurgy & Heat treatment

GATE MT 2021 Q46. Two dislocation lines parallel to z-axis lying in the x-z plane are shown in the figure. The glide force (in Newton) exerted by the edge dislocation on the screw dislocation is:(round off to nearest integer). For the edge, the shear stress component is given by: 𝛕xy = 𝐆𝐛. x. 𝐱2(𝐱 −𝐲 )2 / 𝟐p(𝟏−n) (𝐱𝟐+𝐲𝟐) 𝟐 Given: Shear modulus, G = 28 GPa Poisson’s ratio, n = 0.3 Burgers vector, b = 0.29 nmDistance between the two dislocations = 0.5 nm.

2021 46

Askmemetallurgy Official

Asked: March 31, 2021In: Physical Metallurgy & Heat treatment

GATE MT 2021 Q42. True strain for 60% height reduction of a sample subjected to hot forging is: (round off to 2 decimal places).

Askmemetallurgy Official

Asked: March 6, 2021In: Physical Metallurgy & Heat treatment

GATE MT 2021 Q31. In the absence of any external stress, which one of the following statements related to the interaction of point defect and a dislocation is FALSE:

Poll Results

9.46%(A) An oversized solute atom would preferentially migrate below the slip plane of an edge dislocation. ( 7 voters )

58.11%(B) A spherically symmetric point defect can interact with both the hydrostatic and shear stress fields of a dislocation. ( 43 voters )

18.92%(C) A point defect can locally modify the elastic modulus and thereby can change the interaction energy. ( 14 voters )

13.51%(D) Vacancies are attracted towards the compressive region of dislocation. ( 10 voters )

Based On 74 Votes

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Askmemetallurgy Official

Asked: March 6, 2021In: Physical Metallurgy & Heat treatment

GATE MT 2021 Q25. The vacancy concentration in a crystal doubles upon increasing the temperature from 27 °C to 127 °C. The enthalpy (in kJ mol-1) of vacancy formation is: (round off to 2 decimal places).Given: R = 8.314 J mol-1 K-1

Askmemetallurgy Official

Asked: March 6, 2021In: Physical Metallurgy & Heat treatment

GATE MT 2021 Q23. If the degree of polymerization of polyethylene is 30000, the average molecular weight (in g mol-1) is: _ (round off to nearest integer).(Given: Atomic weights of carbon and hydrogen are 12 and 1, respectively)

Askmemetallurgy Official

Asked: March 6, 2021In: Physical Metallurgy & Heat treatment

GATE MT 2021 Q22. A 0.6 wt.% C steel sample is slowly cooled from 900 °C to room temperature. The fraction of proeutectoid ferrite in the microstructure is: (round off to 2 decimal places). Given: Eutectoid composition: 0.8 wt.% C Maximum solubility of carbon in α-Fe: 0.025 wt.% C

Askmemetallurgy Official

Asked: March 6, 2021In: Physical Metallurgy & Heat treatment

GATE MT 2021 Q21. In the X-ray diffraction pattern of a FCC crystal, the first reflection occurs at a Bragg angle (q) of 30°. The Bragg angle (in degree) for the second reflection will be: (round off to 1 decimal place).

Askmemetallurgy Official

Asked: March 6, 2021In: Physical Metallurgy & Heat treatment

GATE MT 2021 Q20. If saturation magnetization of iron at room temperature is 1700 kA m-1, the magnetic moment (in A m2) per iron atom in the crystal is: ´ 10-23 (round off to 1 decimal place).(Given: Lattice parameter of iron at room temperature = 0.287 nm)

Askmemetallurgy Official

Asked: March 6, 2021In: Physical Metallurgy & Heat treatment

GATE MT 2021 Q19. Consider homogeneous nucleation of a spherical solid in liquid. For a given undercooling, if surface energy of a nucleus increases by 20 %, the corresponding increase (in percent) in the critical radius of the nucleus is: (round off to nearest integer).

Askmemetallurgy Official

Asked: March 6, 2021In: Physical Metallurgy & Heat treatment

GATE MT 2021 Q15. The grain size (X) of annealed specimens follows a symmetric distribution with a mean (µ) of 5 µm and a standard deviation (s) of 0.5 µm. The percentage of specimens with grain size in the range 5 to 6 µm is expected to be: (round off to nearest integer).Given: For the symmetric distribution: Probability 𝐏(𝐗 £ µ + 𝟐s) = 𝟎. 𝟗𝟖 Given: For the symmetric distribution: Probability 𝐏(𝐗 £ µ + 𝟐s) = 𝟎. 𝟗𝟖

Askmemetallurgy Official

Asked: March 6, 2021In: Physical Metallurgy & Heat treatment

GATE MT 2021 Q10. Which one of the following is the correct decreasing sequence of Quenching Power for quenchants used in heat treatment of steels?

Poll Results

8.7%(A) Oil > Water > Brine > Air ( 6 voters )

18.84%(B) Brine > Oil > Water > Air ( 13 voters )

59.42%(C) Brine > Water > Oil > Air ( 41 voters )

13.04%(D) Water > Brine > Oil > Air ( 9 voters )

Based On 69 Votes

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Askmemetallurgy Official

Asked: March 6, 2021In: Physical Metallurgy & Heat treatment

GATE MT 2021 Q9. Which one of the following elements alloyed with iron is a ferrite stabilizer?

Poll Results

13.79%(A) Nickel ( 8 voters )

13.79%(B) Manganese ( 8 voters )

12.07%(C) Carbon ( 7 voters )

60.34%(D) Silicon ( 35 voters )

Based On 58 Votes

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