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Chemical Engineering - Mechanical Operations

Exercise : Mechanical Operations - Section 5
21.
rpm of a trommel at critical speed is given by (where, D = Diameter of trommel in ft)
76.75 D
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
Optimum ratio of operating speed to critical speed of a trommel is
0.33-0.45
1.33-1.45
0.5-2
1.5-2.5
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
The process opposite to 'dispersion' is termed as the
flocculation
sedimentation
filtration
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.
The cake resistance increases steadily with the time of filtration in a plate and frame filter employing constant __________ filtration.
rate
pressure
both (a) & (b)
neither (a) nor (b)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
Grinding efficiency of a ball mill is of the order of __________ percent.
1-5
40-50
75-80
90-95
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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