GATE MT exam:gate PYQs & Answers — Page 54

Questions 531–540 of 650. Imported answers require independent review unless marked reviewed.

Topic practice 650 questionsPage 54 of 65

For a laminar flow of a liquid metal over a flat plate, the thicknesses of the velocity and thermal boundary layers are

and

respectively. Kinematic viscosity (viscosity/density) of liquid metal is significantly lower than its thermal diffusivity [thermal conductivity / (density × specific heat)]. Based on this information, pick the correct option.

(Note: The temperature of the liquid metal is different from that of the plate.)

Your answerChoose one option.

Information insufficient

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What is the most-abundant anion in

melt?

Your answerChoose one option.

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Analysis of a flow phenomenon in a system requires the following variables:

i. Pressure [M L

] ii. Velocity of the fluid [L T

] iii. Size of the system [L] iv. Density of the fluid [M L

] v. Viscosity of the fluid [M L

]

According to Buckingham Pi theorem (dimensional analysis) what is the number of independent DIMENSIONLESS variables needed to describe this system?

Your answerChoose one option.

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In froth flotation, the primary purpose of adding collectors is to:

Your answerChoose one option.

make the surface of the mineral hydrophobic.

make the surface of the mineral hydrophilic.

stabilize the froth.

adjust the pH.

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Arrange the following in the correct sequence of operations in an integrated steel plant:

i. Basic Oxygen Furnace (BOF) ii. Blast Furnace (BF) iii. Ruhrstahl Heraeus Degasing Process (RH) iv. Ladle Furnace Process (LF)

Your answerChoose one option.

BOF→BF→LF→RH

BF→LF→BOF→RH

RH→LF→BF→BOF

BF→BOF→LF→RH

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During decarburization in a steel bath at 1550 °C, the compositions of dissolved C (wt.%C) and dissolved O (wt.%O) follow the relation: (wt.%C)(wt.%O) = K When the partial pressure of CO (

) is 1 atm, K = 0.002. If

atm, what is the value of K, at the same temperature? Note: Assume Henry’s law is applicable.

Your answerChoose one option.

0.06

0.002

0.02

0.0002

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During upset forging, and considering friction, which of the following profiles represents the axial compressive stress? Note: In these profiles, the absolute value of the axial compressive stress is plotted on the y-axis.

Diagram for Metallurgical Engineering question 7

Your answerChoose one option.

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Consider the following engineering components:

P. Gas turbine blades Q. Tungsten-based heavy alloy penetrators R. Self-lubricating bearings S. Engine block of an automobile

Which of the following two components are produced by powder metallurgy?

Your answerChoose one option.

P & Q

Q & R

Q & S

P & S

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Which of the following materials are protected by passivation (i.e., formation of a thin adherent film on the surface) from corrosion?

P. Aluminium alloys Q. Mild steel R. Stainless steel S. Silver

Your answerChoose one option.

P & Q

Q & R

Q & S

P & R

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The c/a ratio of Zn (hcp) is 1.856. Slip at room temperature occurs most easily on which of the following slip systems in Zn:

Note: In hcp metals, the ideal c/a ratio is 1.633.

Your answerChoose one option.

{1\bar{1}00} ⟨11\bar{2}0⟩

{1\bar{1}00} ⟨0002⟩

{0001} ⟨11\bar{2}0⟩

{10\bar{1}1} ⟨11\bar{2}3⟩

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GATE MT exam:gate PYQs

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Question 7

Question 8

Question 9

Question 10