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Mechanical Operations

Mechanical Operations
The distribution given by microscopic analysis of powder is

Length
Number
Volume
Area

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Mechanical Operations
Ultrafine grinders operate principally by

Impact
Attrition
Slow compression
Cutting action

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Mechanical Operations
Close circuit grinding by a ball mill with air sweeping employs a

Both A & B
Cyclone separator between mill & classifier
Neither A nor B
Classifier

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Mechanical Operations
Chance process is used for the

Water treatment
Concentration of pyrites
Concentration of iron ore
Cleaning of coal

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Mechanical Operations
Additives used for promoting the floccula-tion of particles is a/an

Surface active agent
Neither A nor B
Both A & B
Electrolyte

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Mechanical Operations
Activators are those chemicals which help buoying up one mineral in preference to the other in the froth floatation process. Which of the following is an activator?

Cresylic acid
Copper sulphate
Sodium carbonate
Calcium carbonate

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