Extractive Metallurgy MCQ Questions and Answers

11

How much range of sintering temperature (°C) is generally used for Zinc sulphate

A) 1200 - 1400 B) 1200 - 1300 C) 1200 - 1500 D) 1200 - 1600

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Answer & Solution

Answer: Option A

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12

In Bayer Process, how much % of the gibbsite is converted into aluminum oxide

A) 95% B) 80% C) 88% D) 90%

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Answer & Solution

Answer: Option D

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13

Ores of copper are

A) Cuprite: Cu₂O B) Malachite: CuSiO₃.2H₂O C) Chrysocolla: CuCO₃.Cu(OH)₂ D) All are correct

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Answer & Solution

Answer: Option D

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14

Which of the following is a suitable method to remove hydrogen from molten Aluminium?

A) Expose flowing melt to vacuum B) Bubble humidified argon gas through the melt C) Increase melt temperature D) Cover melt surface with a flux

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Answer & Solution

Answer: Option B

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15

For electrorefining of Al which statement is correct

A) By Hoop's Process B) Purity of metal is 99.99% C) Both A and B D) None of these

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Answer & Solution

Answer: Option C

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16

Determine the correctness or otherwise of the following
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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Answer & Solution

Answer: Option C

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17

Phosphorous is added to copper melt to

A) remove hydrogen B) deoxidise the me C) improve fluidity D) reduce shrinkage

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Answer & Solution

Answer: Option A

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18

The product(s) of roasting of a sulfide ore is (are)

A) oxide only B) sulphate only C) oxide and sulphate D) dependent on temperature and partial pressures of oxygen and sulfur dioxide

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Answer & Solution

Answer: Option A

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19

Match. the entities in Column 1 with the corresponding processes in Column 2.

Column 1	Column 2
P. Xanthate salts	1. Extraction of AI
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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Answer & Solution

Answer: Option C

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20

What are the advantages of ISP of Zn extraction

A) Economical production of Zn B) Efficiency overall high but Zn recovery expensive C) Entire amount of Au, Sb etc. recover D) All are correct

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Answer & Solution

Answer: Option D

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Extractive Metallurgy MCQ Questions and Answers | Metallurgical Engineering