Apt 308: Unit Operation In Processing Technology Question Paper
Apt 308: Unit Operation In Processing Technology
Course:Bachelor Of Science In Food Science And Technology
Institution: Masinde Muliro University Of Science And Technology question papers
Exam Year:2017
Question 1
It is desired to mix 93kg of a component with 5kg of another in such a way that they are well distributed in each other. After a time interval of 5 minutes of mixing, samples of the mixture were taken and tested for one of the components. The following data was obtained as a percentage ;
0.0,16.5,3.2,2.2,12.6,9.6,0.2,4.6,0.5,8.5
And after 10 minutes of mixing ;
3.4,8.3,7.2,6.0,4.3,5.2,6.7,2.6,4.3,2.0
Calculate :
i. The initial variance
ii. The fractional composition of this components in the mass of the time sampling
iii. The random variance
iv. The mixing index
v. The time the mixing process will require to attain a mixing degree of 0.02 and now assuming that the number of particles in a sample is 30.
Question 2.
a). Explain how and why resistance filteration increases as filteration progress
b). On whwt does compressibility of a filter cake depend and how does it affect filteration.
Question 3
a). Give reasons why communition is an essential operation in Industry.
b). From an energy point of view discuss the disintergration of materials during the grinding process.
c). How does Kirk's law vary from Rettinger's
Question 4.
a).Give brief general description of crystallization process.
b). What is nucleation in crystallization and on what does it depends?
c). Briefly explain the principle of operation of crystallizers.
d). Describe the working principle of vacuum crystallizers.
Question 5
a).Briefly discuss the principle of operation of membrane separators with special reference to pervaporation.
b). Outline the significance of freezing /chilling in food preservation
Question 6
a).compare vacuum dryers to freeze dryers.
b). Name the basic factors that affectthe rate of evaporation
c). State the important practical considerations you would have to make in evaporators.
Question 7
a). Give your understanding of terms absorption and desorption
b). List the factors which control the operation of extraction.
c). State the principls applied in component separation using distillation and in fractional distillation.
d). Give reasons why centrifugation is a superior separation mechanism to sedimentation and briefly outline how it works.
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