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Mechanical Operations

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

10
25
50
75

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Mechanical Operations
At low Reynold's number, the power (P) required for agitating a fluid in a stirred tank becomes independent of inertial forces. In this limit, indicate which of the following relations is satisfied: Po = ρ/ρN3 D5 : Power number Re = ρ N D2/μ: Reynold's number N is the impeller rotational speed, and D is the impeller diameter.

Po ∝ Re-1.0
Po ∝ Re1.0
Po ∝ Re0.5
Po ∝ Re0.0

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Mechanical Operations
Moisture can be removed from lubricating oil using

Tubular centrifuge
Clarifier
Sparkler filter
Vacuum leaf filter

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Mechanical Operations
Which one is a filter aid?

None of these
Convas fabric
Calcined lime
Diatomaceous earth

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Mechanical Operations
__________ mills are termed as impactors.

Rolling-compression
Cage
Hammer
None of these

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Mechanical Operations
The value of 'angle of nip' is generally about

32°
16°
64°
52°

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