Mineral Dressing in Metallurgy MCQ Questions and Answers

11

The most efficient equipment for removal of sub-micronic dust particles from blast furnace gas is the

A) venturi atomizer B) gravity settling chamber C) electro-static precipitator D) cyclone separator

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Answer & Solution

Answer: Option C

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12

Impurities present with minerals is called

A) Ore B) minerals C) gangue D) none of these

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Answer & Solution

Answer: Option C

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13

The material is crushed in a gyratory crusher by the action of

A) impact B) compression C) attrition D) cutting

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Answer & Solution

Answer: Option B

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14

Mechanical efficiency of a crusher is defined as the ratio of the

A) energy supplied to the crusher to the energy created by crushing B) surface energy created by crushing to the energy supplied to the crusher C) energy absorbed by the solid to the energy Supplied to the crusher D) surface energy created by crushing to the energy absorbed by the solid

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Answer & Solution

Answer: Option C

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15

200 mesh sieve size corresponds to . . . . . . . . microns.

A) 24 B) 74 C) 154 D) 200

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Answer & Solution

Answer: Option B

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16

In case of a ball mil,

A) a coarse feed requires a larger ball B) fine feed requires a larger ball C) operating speed should be more than critical speed D) none of these

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Answer & Solution

Answer: Option A

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17

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

A) 37 B) 53 C) 74 D) 86

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Answer & Solution

Answer: Option C

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18

Match the following processes with their physical principles.

Group 1	Group 2
P. Floatation	1. Difference in specific gravity
Q. Jigging	2. Difference in hydrophobicity
R. Heavy media separation	3. Difference in lateral movements
S. Tabling	4. Differential initial accelaration

A) P-4, Q-2, R-1, S-3 B) P-2, Q-4, R-1, S-3 C) P-4, Q-3, R-2, S-1 D) P-1, Q-2, R-3, S-4

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Answer & Solution

Answer: Option B

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19

The grinding in hammer crusher takes place due to

A) attrition B) impact C) both A and B D) neither A nor B

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Answer & Solution

Answer: Option C

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20

Match the unit operation in Group I with its corresponding principal 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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Answer & Solution

Answer: Option A

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Mineral Dressing in Metallurgy MCQ Questions and Answers | Metallurgical Engineering