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Chemical Engineering - Mechanical Operations

Exercise : Mechanical Operations - Section 6
11.
Separation of solid particles based on their densities is called
sizing
sorting
clarification
dispersion
Answer: Option
Explanation:
No answer description is available. Let's discuss.
12.
Activators are those chemicals which help buoying up one mineral in preference to the other in the froth floatation process. Which of the following is an activator?
Cresylic acid
Copper sulphate
Calcium carbonate
Sodium carbonate
Answer: Option
Explanation:
No answer description is available. Let's discuss.
13.
__________ are mixed using ribbon blenders.
Lumpy solids and low viscosity liquids
Dry powders
High viscosity liquids
Thick pastes
Answer: Option
Explanation:
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14.
During agitation of liquids, the
Froude number is independent for the curves between power number and Reynolds number in baffled system.
Power number becomes independent of impellers Reynolds number at high Reynolds number, but is dependent on the geometry of the impeller.
Froude number is used to account for the effect of surface (e.g., the centre vortex) on the power number.
all (a), (b) and (c).
Answer: Option
Explanation:
No answer description is available. Let's discuss.
15.
For crushing of solids, the Rittinger's law states that the work required for crushing is proportional to
the new surface created.
the size reduction ratio.
the change in volume due to crushing.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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