Pine oil used in froth floatation technique acts as a/an

Which of the following gives the work required for size reduction of coal to -200 mesh in a ball mill most accurately ?

A. Rittinger's law

B. Kick's law

C. Bond's law

D. None of these

Traces of solids are removed from, liquid in a

A. Classifier

B. Clarifier

C. Sparkler filter

D. Rotary vacuum filter

__________ mills are termed as disintegrators.

A. Cage

B. Compartment

C. Pebble

D. All of the above

Which of the following is not categorised as a "mechanical operation"?

A. Agitation

B. Filtration

C. Size enlargement

D. Humidification