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Mechanical Operations

Mechanical Operations
Which of the following may prove unsuitable for filtering volatile liquids?

Centrifugal filter
Vacuum filter
Gravity filter
Pressure filter

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Mechanical Operations
There is practically no alternative/competitor to __________ in the beneficiation treatment of sulphide ores.

Tabling
Froth floatation
Jigging
Classification

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Mechanical Operations
Sphericity of raschig ring (whose length and diameter are equal) is

1
>1
2

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

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Mechanical Operations
__________ mill is not used for grinding wheat into flour and for milling of cereals & other vegetable products.

Buhrstone
Attrition
Pebble
Roller

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Mechanical Operations
Which of the following must be stored in silos and not in open yard?

Sand
High V.M. bituminous coal
Coke breeze
None of these

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