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Chemical Engineering - Mechanical Operations

Exercise : Mechanical Operations - Section 4
11.
Width and speed of a conveyor belt depends upon the __________ of the material.
lump size
bulk density
both (a) & (b)
neither (a) nor (b)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
12.
Higher is the mesh number, smaller will be the aperture size of the screen. It means that the aperture size of a 200 mesh screen will be smaller than that of 20 mesh screen. This is valid for
British standard screens.
German standard screens (DIN 1171) etc.
American standard screens (ASTM and Tyler standard screens).
all (a), (b) and (c).
Answer: Option
Explanation:
No answer description is available. Let's discuss.
13.
Pick out the wrong statement.
Cummulative analysis for determining surface area is preferred over differential analysis, because of the assumption that "all particles in a simple fraction equal in size" is not needed for cummulative anslysis unlike differential anlaysis.
A gate diagram is a plot of cummulative percent by weight undersize vs. the reciprocal of diameter, in which the area beneath the curve represents the surface.
Capacity of crusher in choke feeding is increased.
Rolling of pebbles/balls from top to bottom of the heap in tumbling mills is called 'cascading and throwing of the balls through the air to the toe of the heap is called 'cataracting'.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
14.
Which of the following size reduction equipments employs mainly attrition for ultrafine grinding ?
Jet mills
Fluid energy mill
Micronizer
all (a), (b) and (c)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
15.
Tank filter (e.g., Nutsch filter) is
a high pressure filter.
a continuous filter.
used for small scale filtration work.
a leaf filter.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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