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Mechanical Operations

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

Agitation
Filtration
Size enlargement
Humidification

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Mechanical Operations
The optimum moisture content in solids to be crushed/ground ranges from __________ percent.

10 to 15
3 to 4
15 to 20
8 to 10

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Mechanical Operations
Vibrating screens have capacity in the range of __________ tons/ft² .mm mesh size.

0.2 to 0.8
5 to 25
50 to 100
100 to 250

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Mechanical Operations
Helical screw agitator is used for

Mixing highly viscous pastes
Mixing liquids at very high temperature (> 250 °C)
None of these
Blending immiscible liquids

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

∝ 1/ ΔP
Independent of ΔP
∝ ΔP
∝ √ΔP

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Mechanical Operations
What is the usual value of angle of nip for crushing of ordinary rock in smooth steel crushing rolls?

40°
16°
32°
46°

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