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Mechanical Operations

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

Filtration
Humidification
Agitation
Size enlargement

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Mechanical Operations
Coal is finally pulverised to 200 mesh size for burning in boilers by a

Roll crusher
Hammer crusher
Gyratory crusher
Ball mill

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Mechanical Operations
The specific cake resistance for incompressible sludges is (where ΔP = pressure drop over cake)

∝ √ΔP
Independent of ΔP
∝ 1/ ΔP
∝ ΔP

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Mechanical Operations
Feed size of ≥ 25 cms can be accepted by

Fluid energy mill
Ball mill
Jaw crusher
Rod mill

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Mechanical Operations
For achieving maximum capacity of the ball mill, the ball charge should be equal to about __________ percent of the ball mill volume.

50
75
25
10

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Mechanical Operations
In case of a ball mill,

None of these
Operating speed should be more than the critical speed
Fine feed requires a larger ball
Coarse feed requires a larger ball

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