Non-ferrous Metal Extraction - Mineral Processing and Extractive Metallurgy - Metallurgical Engineering Previous Year Questions

1

2007 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Non-ferrous Metal Extraction

Metallurgical Engineering (MT) 2007

Which metal is extracted by leaching?

A

Iron

B

Aluminum

C

Lead

D

Gold

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2

2007 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Non-ferrous Metal Extraction

Metallurgical Engineering (MT) 2007

The process of cementation involves

A

separation of the desired metal by adding a more reactive metal

B

elimination of a more reactive metal from molten metal by preferential oxidation

C

refining by preferential dissolution of the desired metal in an organic solvent

D

extraction by selective dissolution of the desired metal in an inorganic solvent

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3

2009 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Non-ferrous Metal Extraction

Metallurgical Engineering (MT) 2009

Match the extraction methods in Group 1 with the metals in Group 2.

Group 1	Group 2
P. Roasting followed by carbothermic reduction	1. Ti
Q. Electrolysis of fused salt	2. Pb
R. Roasting followed by controlled oxidation	3. Al
S. Halide process	4. Cu
	5. Au

A

P-2, Q-3, R-4, S-1

B

P-5, Q-4, R-3, S-1

C

P-2, Q-5, R-1, S-4

D

P-3, Q-2, R-5, S-1

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4

2010 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Non-ferrous Metal Extraction

Metallurgical Engineering (MT) 2010

Which of these metals CANNOT be electroplated from aqueous electrolyte?

A

Al

B

Cu

C

Ni

D

Zn

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5

2010 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Non-ferrous Metal Extraction

Metallurgical Engineering (MT) 2010

Which of the following statements regarding Kroll’s process is NOT correct?

A

Pure metal chlorides serve as main raw material

B

Reduction is done only by sodium

C

Reduction chamber should be free of oxygen

D

It is used for extraction of titanium and zirconium

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6

2011 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Non-ferrous Metal Extraction

Metallurgical Engineering (MT) 2011

Aluminum is NOT commercially produced by carbo-thermic reduction primarily because

A

aluminum metal will have excessive dissolved oxygen

B

it melts at too low a temperature

C

it does not vaporize at reasonable temperatures

D

Al-Al₂O₃ line is too low in the Ellingham diagram and needs excessively high temperatures

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7

2012 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Non-ferrous Metal Extraction

Metallurgical Engineering (MT) 2012

Copper can be reduced from acidic copper sulphate solution by

A

Silver

B

Iron

C

Carbon

D

Lead

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8

2012 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Non-ferrous Metal Extraction

Metallurgical Engineering (MT) 2012

Match the processes given in Group I with the corresponding metals in Group II

A

P-1, Q-2, R-1, S-4

B

P-2, Q-3, R-1, S-4

C

P-2, Q-1, R-3, S-4

D

P-2, Q-3, R-4, S-1

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9

2012 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Non-ferrous Metal Extraction

Metallurgical Engineering (MT) 2012

Identify the correct combination of the following statements
P. Bessemer converter can be used in copper smelting
Q. The Mond process for nickel involves reaction of metal with H₂ gas
R. Roasted ZnS concentrates can be smelted in a blast furnace
S. Magnesium metal can be produced by electrolysis of sea water

A

P, R and S

B

P, Q and R

C

P and Q

D

Q and S

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10

2013 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Non-ferrous Metal Extraction

Metallurgical Engineering (MT) 2013

Determine the correctness or otherwise of the following Assertion (a) and Reason (r).
Assertion: For the extraction of metal values from their sulphide concentrates by hydrometallurgical route, leaching with oxygen under high pressure is used.
Reason: Presence of oxygen under high pressure causes roasting of sulphides, which helps in leaching of the values.

A

a is true but r is false

B

a is false but r is true

C

both a and r are true, and r is the reason for a

D

both a and r are true, but r is not the reason for a

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11

2017 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Non-ferrous Metal Extraction

Metallurgical Engineering (MT) 2017

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⁻¹ zinc) is __________ (answer up to two decimal places) (Atomic weight of Zn = 65)

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12

2018 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Non-ferrous Metal Extraction

Metallurgical Engineering (MT) 2018

Match the metal in Group 1 with the appropriate extractive process in Group 2

A

P. Fe 1. Metallothermic Reduction

B

Q. Ni 2. Carbothermic reduction

C

R. Al 3. Matte Smelting

D

S. Cr 4. Fused Salt Electrolysis

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13

2019 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Non-ferrous Metal Extraction

Metallurgical Engineering (MT) 2019

100 Metric tons of copper concentrate containing 21 wt.% Cu is to be processed in 6 months with 25 working days per month and 8 working hours per day. The concentrate is leached by sulphuric acid and electrolyzed in 10 cells arranged in series. The minimum current rating (Ampere per month per cell, rounded off to the nearest integer) is ____________.

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14

2021 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Non-ferrous Metal Extraction

Metallurgical Engineering (MT) 2021

Which one of the following is a hydrometallurgical operation?

A

Roasting

B

Leaching

C

Zone refining

D

Smelting

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15

2022 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Non-ferrous Metal Extraction

Metallurgical Engineering (MT) 2022

Titanium is produced commercially by ________

A

smelting reduction of \(TiO_2\)

B

thermal dissociation of \(TiH_2\)

C

reduction of \(TiCl_4\) by Mg

D

reduction of \(TiO_2\) by \(H_2\)

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16

2024 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Non-ferrous Metal Extraction

Metallurgical Engineering (MT) 2024

Which one of the following processes is NOT related to the extraction and refining of titanium from ilmenite ore?

A

Pidgeon’s process

B

Sorel process

C

Van Arkel process

D

Kroll’s process

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17

2024 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Non-ferrous Metal Extraction

Metallurgical Engineering (MT) 2024

Which one of the following is the correct statement about the industrial production of aluminium from pure dry alumina by Hall-Héroult electrolytic reduction?

A

Cell is operated at a high voltage (220 to 240 V) with a very low current density.

B

Cell is operated at a low voltage (5 to 7 V) with a very low current density.

C

Cell is operated at a high voltage (220 to 240 V) with a very high current density.

D

Cell is operated at a low voltage (5 to 7 V) with a very high current density.

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18

2025 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Non-ferrous Metal Extraction

Metallurgical Engineering (MT) 2025

Copper is being electrodeposited from a CuSO₄ bath onto a stainless steel cathode of total surface area of 2 m² in an electrolytic cell operated at a current density of 200 A m⁻² with a current efficiency of 90%.
The mass of copper deposited in 24 h is ______ kg (rounded off to two decimal places).
Given: Faraday's constant = 96500 C mol⁻¹, atomic mass of copper = 63.5 g mol⁻¹

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19

2026 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Non-ferrous Metal Extraction

Metallurgical Engineering (MT) 2026

Which one of the following options is correct?
Red mud is generated in the production of:

A

Aluminium

B

Iron

C

Titanium

D

Copper

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