In ore beneficiation method, when mineral particles are subjected to force fields such as magnetic, gravitation and electrical, their behaviour depends on their size.

The figure below shows the cumulative size distribution of particles of a crushed mineral. 10 kg of this material is first passed through a sieve of size 400 micron and then through a sieve of size 300 micron. The weight of mineral (in kg ) that is retained on the 300 micron sieve is . . . . . . . .
Mineral Dressing in Metallurgy mcq question image

Mineral Dressing in Metallurgy mcq question image

A

1

B

1.8

C

3

D

5.6

Which of the following is incorrect? a) Pyrolusite is an ore/mineral of Manganese b) Ilmenite is an ore/mineral of Titanium c) Calamine is an ore/mineral of Copper

A

Only a

B

Only a and b

C

Only c

D

Only a and c

The critical reasoning question is based on a short argument, a set of statements, or a plan of action. For each question, select the best answer of the choices given. The size of particles is directly linked to their potential for causing health problems. Small particles less than 10 micrometers in diameter cause the greatest problems, as they can get deep into the lungs and some may get into the bloodstream. One being exposed to such particles can affect both the lungs and the heart of a person. But there are particles that are causing environmental effects too, few of which are given below. Which among the following below options does not talk about the effects of these particles on the environment?

A

Particles can be carried to distances by wind making lakes and streams acidic.

B

They can change the nutrient balance in coastal waters and larger river basins.

C

Causing premature death in people causing nonfatal heart attacks.

D

They can damage the sensitive forests and farm crops.

E

None of the above.

Which of the following statements are true with respect to iron ore?
I. Limestone and coal are important for smelting iron ore
II. More than 20% of the world iron ore deposits are in India
III. Odisha and Jharkhand top in the production of iron ore
IV. Iran is the largest buyer of Indian iron ore

A

I, II and III

B

II and III

C

III and IV

D

II, III and IV

Frother is added in the froth floatation cell used in ore beneficiation to stabilise the air bubbles (i.e., froth), which will hold the ore particles, but it does not affect the floatability of minerals. Which of the following is not used as a frother?

A

Cresylic acid

B

Xanthaies

C

Pine oil

D

All of the above

The following information is provided for an ore deposit:
Number of waste blocks = 10
Number of ore blocks = 5
Volume of each waste block, m³ = 600
Total cost of waste handling per m³ = Rs. 100
Tonnage of each ore block = 400
Total cost of ore handling per ton = Rs. 150
Sale price of ore per ton = Rs. 500
The net cash flow of mining the deposit in lakhs of rupees, is

A

3.4

B

2.5

C

1.0

D

0.8

Given below are certain facts about the “gravitational force”. Identify the INCORRECT one. A. Gravitational force depends on the intervening medium between the objects. B. Gravitational force is a type of conservative force. C. The gravitational force between two particles acts perpendicular to the line joining the two particles.

A

Only A

B

B and C

C

A and C

D

All are correct

Which of the following statement about the force of attraction between the particles is/are correct? The force of attraction between the particles of the same substance is known as cohesion. The force of attraction is maximum in the particles of solid matter and minimum in the particles of gaseous matter.

A

Only 1

B

Only 2

C

Both 1 & 2

D

None of the above

The stoping method selected, where ore body is thick veins type ore and walls are strong and steeply dipping ore i.e. footwall steeper than angle of repose of broken ore is . . . . . . . .

A

Open stoping

B

Shrinkage stoping

C

Cut and fill

D

Sub level stoping

Which of the following is contact force/forces? I. Friction force II. Magnetic force III. Gravitation force

A

Only I

B

Only II

C

Only III

D

Both II and III

In ore beneficiation method, when mineral particles are subjected to force fields such as magnetic, gravitation and electrical, their behaviour depends on their size.

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