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Mechanical Operations

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

Humidification
Agitation
Filtration
Size enlargement

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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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Mechanical Operations
The controlling resistance in a rotary drum vacuum filter is the __________ resistance.

Cake
Piping
Filter medium
None of these

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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
The critical speed of a trommel (N) is related to its dia (D) as

N ∝ D
N ∝ √D
N ∝ 1/√D
N ∝ 1/D

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Mechanical Operations
Run of mine (ROM) coal is crushed by a __________ for use in domestic ovens.

Jaw crusher
Tube mill
Ball mill
Hammer crusher

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