Mineral Dressing in Mining MCQs Questions & Answers | Mining Engineering

A. 30

B. 25

C. 23

D. 20

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

A. crushing

B. tumbling

C. comminution

D. grinding

A. Specific gravity

B. viscosity

C. differences in physico-chemical surface properties

D. particle temperature

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. $$Q = BSs.\cot \left[ {a.k.60n} \right]{m^3}/hr$$

A. 5 m³/min

B. 10 m³/min

C. 15 m³/min

D. 20 m³/min

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

A. BS 1967

B. BS 1796

C. BS 1896

D. BS 2001

A. smaller size of crusher

B. larger size of crusher

C. size of ore as input

D. size is immaterial

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