Mineral Dressing in Mining MCQs Questions & Answers

11

In-situ are of 1.5% Cu got diluted with waste rock of value 0.2% Cu. If the resultant extracted ore has 1.2% Cu, what is the percentage of dilution?

A) 30 B) 25 C) 23 D) 20

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Answer & Solution

Answer: Option A

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12

If the two particles have the same density but different diameter then which of the following is true?

A) particle with smaller diameter has the higher terminal velocity B) particle with larger diameter has the higher terminal velocity C) particle with smaller diameter has the lesser terminal velocity D) particle with larger diameter has the lesser terminal velocity

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Answer & Solution

Answer: Option B

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13

This is the method in which the particle size of the ore is progressively reduced until the clean particles of mineral can be separated?

A) crushing B) tumbling C) comminution D) grinding

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Answer & Solution

Answer: Option C

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14

Which of the following properties are utilized in froth floatation?

A) Specific gravity B) viscosity C) differences in physico-chemical surface properties D) particle temperature

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Answer & Solution

Answer: Option C

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15

Which of the following equation can be used to determine the maximum size of rock gripped in relation to roll diameter and the reduction ratio required?

A) $${\mu _k} = \left[ {\left( {1 + 1.12v} \right)} \right] \div \left( {1 + 6v} \right)\mu $$ B) $$\cos \frac{\theta }{2} = \left( {R + a} \right) \div \left( {R + r} \right)$$ C) $$C\,\operatorname{Sin} \frac{\theta }{2} = \mu \,C\,\operatorname{Cos} \frac{\theta }{2}$$ D) $$Q = BSs.\cot \left[ {a.k.60n} \right]{m^3}/hr$$

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Answer & Solution

Answer: Option B

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16

A mineral processing plant treating almost 10,000 ton of ore per day requires water almost

A) 5 m³/min B) 10 m³/min C) 15 m³/min D) 20 m³/min

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Answer & Solution

Answer: Option D

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17

Which of the following property of frothing action is very useful in froth floatation technique?

A) frothers should not be soluble in water B) frothers would be distributed very unevenly in an aqueous solution C) frothers with amino group and sulpho group is preferred D) frothers should have the ability to adsorb on the air-water interface to reducing surface tension and stabilizing air-bubble

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Answer & Solution

Answer: Option D

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18

The general procedure for test sieving are comprehensively covered in

A) BS 1967 B) BS 1796 C) BS 1896 D) BS 2001

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Answer & Solution

Answer: Option B

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19

Reduction ratio increases with

A) smaller size of crusher B) larger size of crusher C) size of ore as input D) size is immaterial

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Answer & Solution

Answer: Option A

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20

One of the greatest problem lies in comminution is

A) the surface area of known particles of uniform diameter is inversely proportional to the diameter B) the probability of breakage in comminution is high for large particles and rapidly diminishes for fine sizes C) differences exist in the breakage characteristics depending on variations in the work index D) that most of the energy input is absorbed by the machine itself and only a fraction is available for breaking the material

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Answer & Solution

Answer: Option D

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Mineral Dressing in Mining MCQs Questions & Answers | Mining Engineering