GATE MT year:2021 PYQs & Answers — Page 4

Questions 31–40 of 65. Imported answers require independent review unless marked reviewed.

Topic practice 65 questionsPage 4 of 7

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

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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

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If the degree of polymerization of polyethylene is 3000, the average molecular weight (in g mol

) is: __________ (round off to nearest integer).

(Given: Atomic weights of carbon and hydrogen are 12 and 1, respectively)

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Water flows over a plate of finite length. At

from the leading edge, the velocity of the flow is

. The thickness,

(in meter) of the boundary layer at

is: ______ (round off to 2 decimal places). Given:

is the free stream velocity.

Diagram for Metallurgical Engineering question 24

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The vacancy concentration in a crystal doubles upon increasing the temperature from 27 °C to 127 °C. The enthalpy (in kJ mol

) of vacancy formation is: ______ (round off to 2 decimal places). Given:

J mol

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The minimum value of

for the equation

is ______.

Your answerChoose one option.

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Match the forming process (in Column I) with its name (in Column II):

Column I:

(P) diagram

Diagram for Metallurgical Engineering question 27

(Q) diagram

Diagram for Metallurgical Engineering question 27 (figure 2)

(R) diagram

Diagram for Metallurgical Engineering question 27 (figure 3)

(S) diagram

Diagram for Metallurgical Engineering question 27 (figure 4)

Column II:

Extrusion

Rolling

Deep Drawing

Open Die Forging

Your answerChoose one option.

P–1, Q–2, R–3, S–4

P–3, Q–1, R–4, S–2

P–3, Q–4, R–1, S–2

P–1, Q–4, R–3, S–2

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Match the nondestructive technique (in Column I) with its underlying phenomenon (in Column II):

Column I (P) Dye penetrant test (Q) Radiography (R) Eddy current test (S) Ultrasonic inspection

Column II

X-ray absorption

Capillary action

Elastic waves reflection

Electromagnetic induction

Your answerChoose one option.

P–4, Q–3, R–2, S–1

P–2, Q–1, R–3, S–4

P–2, Q–1, R–4, S–3

P–3, Q–2, R–1, S–4

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Number of degrees of freedom for the following reacting system is: M (s) + CO₂ (g) = MO (s) + CO (g)

Your answerChoose one option.

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The condition for getting the binary phase diagram of A-B (shown below) is:

Diagram for Metallurgical Engineering question 30

Given:

– Enthalpy of mixing of solid

– Enthalpy of mixing of liquid

Your answerChoose one option.

and

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GATE MT year:2021 PYQs

Question 21

Question 22

Question 23

Question 24

Question 25

Question 26

Question 27

Question 28

Question 29

Question 30