GATE MT 2017 Paper 1 — page 11

Questions 31–33 of 65. Imported answers require review unless explicitly marked reviewed.

and

are the melting points of pure metal A and pure stoichiometric oxide

, respectively, and

. The stoichiometric metal oxidation reaction

is in equilibrium at 1 atm pressure at temperature less than

. If the temperature increases, which schematic represents the correct standard free energy change versus temperature plot?

Your answerChoose one option.

Diagram for Metallurgical Engineering question 31

Diagram for Metallurgical Engineering question 31 (figure 2)

Diagram for Metallurgical Engineering question 31 (figure 3)

Diagram for Metallurgical Engineering question 31 (figure 4)

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A continuous cast steel slab, 1 m × 1 m × 0.1 m, at 1298 K cools in air. The initial rate of heat loss (in kW) from the top surface of slab by radiation and convection is __________ (answer up to two decimal places)

Given: (i) Ambient temperature = 298 K, (ii) emissivity of steel = 0.8, (iii) convective heat transfer coefficient = 4.6 W m

, (iv) Stefan-Boltzmann constant (

) =

W m

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The Pourbaix plot of the reaction

in potential (E) versus pH diagram is:

Your answerChoose one option.

Diagram for Metallurgical Engineering question 33

Diagram for Metallurgical Engineering question 33 (figure 2)

Diagram for Metallurgical Engineering question 33 (figure 3)

Diagram for Metallurgical Engineering question 33 (figure 4)

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2017 · Paper 1

Question 31

Question 32

Question 33