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Mechanical Operations

Mechanical Operations
Gelatinous solid (which plug the septum) can be filtered by a __________ filter.

Plate and frame
Vacuum leaf
Precoat
Sparkler

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Mechanical Operations
The power number for a stirred tank becomes constant at high Reynolds number. In this limit, the variation of power input with impeller rotational speed (N) is proportional to

N³
N°
N¹
N²

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Mechanical Operations
Gummy & sticky materials like molasses, sugar etc. are best transported/handled by using a __________ conveyor.

Slat
Ribbon
Screw
Drag

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Mechanical Operations
Work index is the gross energy (kWh/tonne of feed) necessary to reduce a very large feed to such a size that 80% of product particles will pass through a 0.1 mm screen. The value of work index determined for wet grinding should be multiplied with __________ to get the same for dry grinding.

4.34
0.5
1.34
1

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Mechanical Operations
Trommels separate a mixture of particles depending on their

Electrical & magnetic properties
Wettability
Size
Density

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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 ∝ Re0.0
Po ∝ Re0.5

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