__________ is an ore concentrating metallurgical process involving a chemical change.

The method of concentrating the ore which makes use of the difference in density between ore and impurities is called

A

liquation

B

leaching

C

levigation

D

magnetic separation

Agitated film evaporator is suitable for concentrating __________ liquids.

A

Foaming

B

Viscous

C

Very thin

D

Corrosive

Ore concentration by froth floatation utilises the __________ of ore particles.

A

Density difference

B

Wetting characteristics

C

Terminal velocities

D

None of these

Renal concentrating power can be assessed by

A

Water deprivation test

B

Examination of urinary specific gravity

C

Examination of urinary osmolarity

D

Examination of urine for protein

E

Examination of urine for glucose

Evaporator used for concentrating tomato juice is made of

A

Nickel

B

Brass

C

Stainless steel-glass lined

D

Cast iron-rubber lined

Which of the following methods of stock control aims at concentrating efforts on selected items of material?

A

Perpetual inventory system

B

Material turnover ratio

C

Level setting

D

ABC analysis

A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides

A

Higher economy

B

Lower capacity

C

Both A & B

D

Lower economy

Forced circulation evaporators are normally used for concentrating liquids having

A

Scaling characteristics

B

High viscosity

C

Both A & B

D

Neither A nor B

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

Leaching of uranium ore and gold ore is done in

A

Centrifugal extractor

B

Pachuka tanks

C

Bollman extractor

D

None of these

__________ is an ore concentrating metallurgical process involving a chemical change.

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