GATE MT 2017 Paper 1 — page 14

Complete GATE MT 2017 Paper 1 overview, original pages and practice · Timed previous-paper practice

Questions 40–42 of 65. Imported answers require review unless explicitly marked reviewed.

Paper practice 65 questionsPage 14 of 22

A zinc electrowinning cell is being operated at a current of 400 A, voltage of 3.5 V, and a cathodic current efficiency of 90%. The specific energy consumption (in kJ kg

zinc) is __________ (answer up to two decimal places)

(Atomic weight of Zn = 65)

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Pure metals A and B form two real binary solid solutions α and β at temperature T and pressure P. The free energy versus composition plots for both the solutions are shown below.

Diagram for Metallurgical Engineering question 41

The condition for chemical equilibrium is:

Your answerChoose one option.

Mole fraction of A in α = mole fraction of A in β and mole fraction of B in α = mole fraction of B in β

Mole fraction of B in α = mole fraction of A in β and mole fraction of A in α = mole fraction of B in β

Activity of A in α = activity of A in β and activity of B in α = activity of B in β

Activity of A in α = activity of B in β and activity of B in α = activity of A in β

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Pure orthorhombic sulfur transforms to stable monoclinic sulfur above 368.5 K. Applying Third law of thermodynamics, the value of entropy (in J K

) of transformation at 368.5 K is __________ (answer up to two decimal places)

Given: i. Entropy change associated with heating orthorhombic sulfur from 0 K to 368.5 K is 36.86 J K

. ii. Entropy change associated with cooling monoclinic sulfur from 368.5 K to 0 K is −37.8 J K

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2017 · Paper 1

Question 40

Question 41

Question 42