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Chemical Engineering - Mechanical Operations

Exercise : Mechanical Operations - Section 4
26.
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 ∝ Re0.0
Po ∝ Re0.5
Po ∝ Re1.0
Answer: Option
Explanation:
No answer description is available. Let's discuss.
27.
Which of the following grinding mills has the horizontally arranged rods as the grinding elements thereby delivering more uniform granular products with minimum fines ?
Compartment mill
Rod mill
Pebble mill
Tube mill.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
28.
Rittinger's crushing law states that
work required to form a particle of any size is proportional to the square of the surface to volume ratio of the product.
work required to form a particle of a particular size is proportional to the square root of the surface to volume ratio of the product.
work required in crushing is proportional to the new surface created.
for a given machine and feed, crushing efficiency is dependent on the size of the feed & product.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
29.
Mechanical conveyors which push the material along an endless trough or tube are called scrappers. Which of the following conveying equipments comes under the category of 'scrappers' ?
Bucket conveyor
Flight conveyor
Screw conveyor
Both (b) and (c)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
30.
Sphericity of pulverised coal is
1
<1
>1
∞
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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