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Mechanical Operations

Mechanical Operations
Size measurement of ultrafine particles can be best expressed in terms of

Micron
Centimetre
Surface area per unit mass
Screen size

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

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Mechanical Operations
Size reduction of the __________ can be suitably done by ball mills, crushing rolls and rod mills.

Metalliferrous ores
Non-metallic ores
Basic slags
Asbestos & mica

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

Ball mill
Hammer crusher
Gyratory crusher
Roll crusher

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

Jaw crusher
Ball mill
Rod mill
Fluid energy mill

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Mechanical Operations
The most suitable equipment for the transportation of 200 mesh size particles is a

Pneumatic conveyor
Screw conveyor
Bucket elevator
Belt conveyor

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