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Posted By: kondapalli Member Level: Gold Posted Date: 08 May 2008
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2007 Jawaharlal Nehru Technological University B.Tech Chemical MECHANICAL UNIT OPERATIONS setno3 Question paper
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1. (a) What are the distinctive properties of particulate masses? [8]
(b) Explain how free flowing solids flow out of bins. [8]
2. Discuss about different mixers for free flowing solids. [16]
3. (a) What are various laws of size reduction? State each one of them with their
limitations. [10]
(b) Which law is more realistic in estimating power requirement of a commercial
comminuting machine? Give answer with justification. [3]
(c) State the generalized relation for all the laws of size reduction. [3]
4. (a) What are the major requirements for selection of filter media. [8]
(b) Write short notes on [8]
i. Filter aids
ii. Washing filter cakes
5. (a) Classify the membranes based on size range of the particles. [6]
(b) Distinguish between micro and macrofiltration. [4]
(c) Explain the solution diffusion mechanism under membrane based separations.
[6]
6. Write notes on:
(a) Axial flow conveyor centrifuges [8]
(b) Centrifugal classifiers. [8]
7. (a) Show by dimensional analysis that the power required by mixer impeller can
be correlated by means of power number as a function of Reynolds number
and Froude number [10]
(b) Explain the physical significance of each number in the above correlation. [6]
8. A salt solution is weighing 10,000 kg with 30 wt% Na2CO3 is cooled to 293k. The
salt crystallizes as the dehydrate. What will be the yield of Na2CO3, 10 H2O
crystals if the solubility is 21.5kg anhydrous Na2CO3 / 100 kg of total water. Do
this for the following cases.
(a) Assume that no water is evaporated.
(b) Assume that 3% of the total weight of solution is lost by evaporation of water
in cooling. [16]
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