Mineral Beneficiation - Mineral Processing and Extractive Metallurgy - Metallurgical Engineering Previous Year Questions

1

2007 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Mineral Beneficiation

Metallurgical Engineering (MT) 2007

Cyclones are primarily used for

A

Comminution

B

Concentration

C

Dewatering

D

Classification

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2

2007 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Mineral Beneficiation

Metallurgical Engineering (MT) 2007

A typical collector used in sulphide mineral flotation is

A

Pine oil

B

Potassium ethyl xanthate

C

Oleic acid

D

Polyacrylamide

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3

2007 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Mineral Beneficiation

Metallurgical Engineering (MT) 2007

The settling velocity of a 0.5 micron diameter particle (density = 4900 kg m⁻³) in water (density = 1000 kg m⁻³) under laminar flow conditions is [Given: viscosity of water = 1 centipoise]

A

\(53.08 \times 10^{-9} \, \mathrm{m\,s^{-1}} \)

B

\(40 \times 10^{-9} \, \mathrm{m\,s^{-1}} \)

C

\(53.08 \times 10^{-8} \, \mathrm{m\,s^{-1}} \)

D

\(106.16 \times 10^{-9} \, \mathrm{m\,s^{-1}} \)

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4

2007 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Mineral Beneficiation

Metallurgical Engineering (MT) 2007

The recovery of gold in the following operation is

A

8.25%

B

22.26%

C

85.80%

D

91.80%

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5

2007 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Mineral Beneficiation

Metallurgical Engineering (MT) 2007

What is the volume % solids in a pulp containing 65 wt % solids? Average specific gravity of solids is 2.70

A

72.9%

B

65%

C

59.3%

D

40.7%

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6

2007 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Mineral Beneficiation

Metallurgical Engineering (MT) 2007

Identify the incorrect statement with reference to unit processes in extractive metallurgy.

A

Selective distillation is a purification technique used in extractive metallurgy

B

Coking of coal is carried out in a shaft furnace

C

Precipitation is a hydrometallurgy route of purification

D

Predominance area diagram is used to select the operating conditions of roasting

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7

2008 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Mineral Beneficiation

Metallurgical Engineering (MT) 2008

Cassiterite is an important source for

A

tin

B

titanium

C

molybdenum

D

thorium

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8

2008 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Mineral Beneficiation

Metallurgical Engineering (MT) 2008

The velocity at which particles from a fluidized bed are carried away by the fluid passing through it, is known as

A

elutriation velocity

B

terminal velocity

C

minimum fluidization velocity

D

superficial velocity

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9

2008 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Mineral Beneficiation

Metallurgical Engineering (MT) 2008

A flotation plant treats 100 tons of chalcopyrite containing 2% Cu and produces 6 tons of concentrate. The concentrate has 25% Cu. The percentage Cu in the tailings is

A

0.35

B

0.53

C

0.86

D

0.93

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10

2008 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Mineral Beneficiation

Metallurgical Engineering (MT) 2008

Given the following assertion 'a' and the reason 'r', the correct option is
Assertion a: In Bayer's process high pressure is used to dissolve alumina from bauxite
Reason r: Pressure increases the boiling point of water

A

Both a and r are correct, but r is not the correct reason for a

B

Both a and r are false

C

Both a and r are correct and r is the correct reason for a

D

a is true but r is false

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11

2011 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Mineral Beneficiation

Metallurgical Engineering (MT) 2011

In froth flotation, collector refers to a reagent which primarily

A

promotes bubble break-up and stabilizes the foam

B

adsorbs on the surface of the mineral, and makes it hydrophobic

C

promotes separation of the particles from the froth

D

absorbs on the unwanted mineral and makes it sink

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12

2011 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Mineral Beneficiation

Metallurgical Engineering (MT) 2011

Match the metals in Group I with the corresponding ores in Group II.

Group I	Group II
P. Lead	1. Columbite
Q. Zinc	2. Cassiterite
R. Uranium	3. Galena
S. Niobium	4. Pitchblende
	5. Sphalerite

A

P-3, Q-5, R-2, S-4

B

P-3, Q-2, R-5, S-4

C

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

D

P-3, Q-4, R-5, S-2

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13

2012 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Mineral Beneficiation

Metallurgical Engineering (MT) 2012

Floatation beneficiation is based on the principle of

A

Mineral surface hydrophobicity

B

Gravity difference

C

Chemical reactivity

D

Particle size difference

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14

2012 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Mineral Beneficiation

Metallurgical Engineering (MT) 2012

Which one is NOT an agglomeration process?

A

Nodulizing

B

Briquetting

C

Roasting

D

Pelletizing

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15

2013 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Mineral Beneficiation

Metallurgical Engineering (MT) 2013

In a roasting process, the set of conditions that favour sulphate formation from metal sulphide concentrates are
P. high temperature
Q. high partial pressure of oxygen
R. use of excess air
S. high partial pressure of \( SO_3 \)

A

P, R and S

B

P, Q and R

C

Q and S

D

R and S

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16

2013 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Mineral Beneficiation

Metallurgical Engineering (MT) 2013

Match the metal in Group I with its corresponding ore in Group II

Group I	Group II
(P) Ni	(1) Monazite
(Q) Th	(2) Cassiterite
(R) Pb	(3) Penlandite
(S) Sn	(4) Galena

A

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

B

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

C

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

D

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

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17

2013 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Mineral Beneficiation

Metallurgical Engineering (MT) 2013

Match the unit operation in Group I with its corresponding principle in Group II:

Group I	Group II
(P) Jigging	(1) Modification of surface tension
(Q) Tabling	(2) Difference in density
(R) Heavy media separation	(3) Differential initial acceleration
(S) Flotation	(4) Differential lateral movement

A

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

B

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

C

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

D

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

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18

2013 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Mineral Beneficiation

Metallurgical Engineering (MT) 2013

The aperture size (in μm) of a 200 mesh sieve having a wire diameter of 53 μm is __________

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19

2014 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Mineral Beneficiation

Metallurgical Engineering (MT) 2014

Which one of the following minerals is a source of titanium?

A

Haematite

B

Magnetite

C

Ilmenite

D

Pyrolusite

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20

2016 · Metallurgical Engineering · Mineral Processing and Extractive Metallurgy · Mineral Beneficiation

Metallurgical Engineering (MT) 2016

Match the entities in Column I with the corresponding processes in Column II.

Column I	Column II
[P] Xanthate salts	[1] Extraction of Al
[Q] Thiobacillus Ferrooxidans	[2] Flotation
[R] Hydrocyclone	[3] Classification
[S] Anode effect	[4] Bacterial Leaching

A

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

B

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

C

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

D

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

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