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Chemical Engineering - Mechanical Operations

Exercise : Mechanical Operations - Section 9
21.
A propeller agitator
produces mainly axial flow.
is used for mixing high viscosity pastes.
runs at very slow speed (2 rpm).
all (a), (b) and (c)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
In a grinding operation, the limiting particle size is the size of the __________ particle in the sample.
smallest
largest
either (a) or (b)
neither (a) nor (b)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
Screen capacity is proportional to (where, S = screen aperture)
S
1/S
S2
S
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.
In coal washeries, three products namely the valuable product (i.e. clean/washed coal), discarded product (i.e. mineral matter) and an additional concentrated product called __________ is produced.
concentrate
tailing
middling
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
Actual operating speed of a ball mill may vary from 65 to 80% of the critical speed. Which of the following duties would require the ball mill to be operated at maximum percentage of critical speed ?
Wet grinding in low viscous suspension.
Wet grinding in high viscous suspension.
Dry grinding of large particles (upto 1.25 cms).
Dry grindng of large particles in un-baffed mills.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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