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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 engineering MECHANICAL UNIT OPERATIONS setno2 Question paper
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1. (a) Explain how cohesive solids flow out of bins. [6]
(b) The discharge opening for flow of solids out of bins plays an important role in
maintaining a proper control of the flow rate. Explain. [5]
(c) What causes the solids to arch or bridge in the container and prevent flow?
How is it overcome? [5]
2. (a) Describe the construction and working of the Banbury mixer with a neat
sketch. What are its uses? [6]
(b) A large Banbury mixer masticates 816 kg of scrap rubber with a density of
1121.26 kg/m
3. The power load is 1182 kW/m
3 of rubber. How much cooling
water in m
3/min is needed to remove the heat generated in the mixer if the
temperature of the water is not to rise more than 270C? [10]
3. A material is crushed in a Blake jaw crusher such that the average size of particle
is reduced from 50 mm to 10 mm with a consumption of energy at the rate of 13
kJ/kg. What will be the consumption of energy needed to crush the same material
of average size of 75 mm to an average size of 25 mm?
(a) Assuming Rittinger’s law applies? [6]
(b) Assuming Kick’s law applies? [6]
(c) Which of these results would be regarded as being more reliable and why? [4]
4. Explain the principle of continuous vaccum filtration and describe the functioning
of Rotary-Drum filter with a neat diagram. [16]
5. Write short notes on.
(a) Partial rejection of solutes. [4]
(b) Microfiltration [8]
(c) Different types membranes used for ultrasiltration. [4]
6. (a) Describe the different stages of the hatch sedimentation process. [8]
(b) Write about of rate of sedimentation and explain the relation between the
interface height and settling time. [8]
7. A flat-blade turbine with six blades is installed centrally in a vertical tank. The
tank is 1.5 m in diameter; the turbine is 0.5 m in diameter and is positioned 0.5
from the bottom of the tank. The turbine blades are 125 mm wide. The tank is
filled to a depth of 1.5 m with rubber-latex compound at 650C having a viscosity
of 1200 P and a density of 1129 kg/m3. The turbine is operated at 95 rpm. The
tank is unbaffled. What power will be required to operate the mixer(Make suitable
assumptions)? [16]
8. (a) What is a crystal? Write about invariant crystals and about crystal size and
shape factors? [8]
(b) Write short notes on homogenous nucleatron. [8]
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