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Chemical Engineering - Mechanical Operations

Exercise : Mechanical Operations - Section 3
46.
Pick out the wrong statement.
Gape is the greatest distance between the crushing surfaces or the jaws.
The angle of nip (2α) is the angle between roll faces at the level where they will j ust take hold of a particle and draw it in the crushing zone.
Crushing efficiency is the ratio of the energy absorbed by the solid to the surfaces energy created by crushing.
Reduction ratio is the ratio of the maximum size of the particles in the feed to that in the product.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
47.
Addition of filter aid to the slurry before filtration is done to ...... of the cake.
increase the porosity
increase the compressibility co-efficient
decrease the porosity
decrease the compressibility co-efficient
Answer: Option
Explanation:
No answer description is available. Let's discuss.
48.
Which of the following terminology is not used for size reduction of materials to fine sizes or powders?
Comminution
Dispersion
Pulverisation
Compression
Answer: Option
Explanation:
No answer description is available. Let's discuss.
49.
A tube mill as compared to a ball mill
employs smaller balls.
gives finer size reduction but consumes more power.
has larger length/diameter ratio (>2 as compared to 1 for ball mill).
all (a), (b) and (c).
Answer: Option
Explanation:
No answer description is available. Let's discuss.
50.
Kick's law assumes that the energy required for size reduction is proportional to the logarithm of the ratio between the initial and the final diameters. The unit of Kick's constant is
kW. sec/kg
kWh/kg
kWh/sec. kg
kg/sec.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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