GATE MT 2020 Paper 1 — page 20

Questions 58–60 of 65. Imported answers require review unless explicitly marked reviewed.

If liquid copper is cooled to 1353 K, magnitude of the driving force for liquid to transform to solid is ______ J·mol

(round off to one decimal place).

Given, melting temperature and enthalpy of melting of copper are 1356 K and 13 kJ·mol

respectively.

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1000 kg of liquid steel containing 0.03 wt.% S needs to be desulphurized using a slag to bring the sulphur content down to 0.015 wt.%. The quantity of slag needed is ______ kg (round off to the nearest integer).

Assume:

Thermodynamic equilibrium

No sulphur in the slag prior to desulphurization treatment

Given the equilibrium sulphur partition ratio between slag and steel,

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Zone refining of Si results in residual P content of 0.1 parts per billion by weight. The electrical conductivity of this zone refined Si is ______ Ω

·m

(round off to two decimal places).

Given:

Avogadro number is

Density of Si is 2.33 g·cm

Atomic weight of P is 30.97.

Charge of electron is

A·s.

Mobility of electron is 0.2 m

·V

·s

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2020 · Paper 1

Question 48

Question 49

Question 50