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Chemical Engineering - Mechanical Operations

Exercise : Mechanical Operations - Section 8
36.
Wet grinding in a revolving mill __________ as compared to dry grinding.
gives less wear on chamber walls
requires more energy
increases capacity
complicates handling of the product
Answer: Option
Explanation:
No answer description is available. Let's discuss.
37.
The grinding in a hammer crusher takes place due to the
attrition
impact
both (a) & (b)
neither (a) nor (b)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
38.
A compressible cake has the
maximum porosity at the upstream side.
maximum porosity at the filter medium.
same porosity throughout the cake thickness.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
39.
Which of the following is not used as a filter medium in case of corrosive liquids ?
Nylon
Glass cloth
Metal cloth of monel or stainless steel
Cotton fabric
Answer: Option
Explanation:
No answer description is available. Let's discuss.
40.
In ball mill operation, the feed size (Df in meters) and the ball diameter (Db in metres) are related as ( where, K = grindability constant (varying from 0.9 to 1.4 in increasing order of hard ness))
Db2 = K.Df
Db = K.Df
Db3 = K.Df
Db2 = K.Df2
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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