Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 6th Sem New 2161403 Food Engineering Operations Ii Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI (NEW) EXAMINATION ? WINTER 2018
Subject Code:2161403 Date:20/11/2018
Subject Name:Food Engineering Operations - II
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Compute the horse power requirement for homogenization if flow is 2000 l/h at 250
kg/cm
2
.
03
(b) Do as directed.
i) State the indicator micro-organism for milk pasteurization.
ii) An excessive agitation in liquid food products is not recommended. Justify the
statement.
iii) Define Vacreation.
iv) State the temperature range and time for UHT processing.
04
(c) What do you understand by flash distillation? Derive Rayleigh equation and state its
applications.
07
Q.2 (a) Briefly explain Schiebel column. 03
(b) Explain the principle and working of rotocel extractor. 04
(c) An aqueous ethanol solution, containing 32% in weight of the volatile component, is
continuously fed to a rectification column with an objective to obtain two streams
containing 80% and 8% in weight of ethanol. Also, it is desired to obtain a third stream
containing 28% of the alcohol that is introduced, with feed its ethanol content 72% in
weight. Calculate the number of theoretical plates for reflux ratio as 2. Assume that
the feed is at its boiling point
07
OR
(c) Explain in detail about crystal growth and magma. 07
Q.3 (a) What are advantages of direct heating systems in sterilization plants? 03
(b) Differentiate between first stage and second stage of homogenization. 04
(c) Derive an equation for microbial inactivation rate. Highlight briefly on D value, Z
value and F value.
07
OR
www.FirstRanker.com www.FirstRanker.com
www.FirstRanker.com
FirstRanker.com - FirstRanker's Choice
www.FirstRanker.com
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI (NEW) EXAMINATION ? WINTER 2018
Subject Code:2161403 Date:20/11/2018
Subject Name:Food Engineering Operations - II
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Compute the horse power requirement for homogenization if flow is 2000 l/h at 250
kg/cm
2
.
03
(b) Do as directed.
i) State the indicator micro-organism for milk pasteurization.
ii) An excessive agitation in liquid food products is not recommended. Justify the
statement.
iii) Define Vacreation.
iv) State the temperature range and time for UHT processing.
04
(c) What do you understand by flash distillation? Derive Rayleigh equation and state its
applications.
07
Q.2 (a) Briefly explain Schiebel column. 03
(b) Explain the principle and working of rotocel extractor. 04
(c) An aqueous ethanol solution, containing 32% in weight of the volatile component, is
continuously fed to a rectification column with an objective to obtain two streams
containing 80% and 8% in weight of ethanol. Also, it is desired to obtain a third stream
containing 28% of the alcohol that is introduced, with feed its ethanol content 72% in
weight. Calculate the number of theoretical plates for reflux ratio as 2. Assume that
the feed is at its boiling point
07
OR
(c) Explain in detail about crystal growth and magma. 07
Q.3 (a) What are advantages of direct heating systems in sterilization plants? 03
(b) Differentiate between first stage and second stage of homogenization. 04
(c) Derive an equation for microbial inactivation rate. Highlight briefly on D value, Z
value and F value.
07
OR
www.FirstRanker.com www.FirstRanker.com
www.FirstRanker.com
www.FirstRanker.com
Q.3 (a) Find the velocity at which the fat globules will begin to move upward, towards the
surface in case of centrigugal separation.
Given Parameters:
i. Diameter = 3 ?m = 3 ? 10
-6
m
ii. ( ?s - ?f) = 48 kg/m
3
iii. ? = 1.42 cp
iv. R = 0.2 m
v. n= 5400 rpm
03
(b) Find two equivalent processes of 100
0
C and 150
0
C, which will deliver the same
lethality as required F121 value of 4.5 minutes, Z value = 10.5
0
C.
04
(c) Discuss the effect of homogenization treatment on product attributes. 07
Q.4 (a) Introduce briefly.
i) Clarifixation
ii) Stoke?s law
iii) 12 ? D Process
03
(b) Differentiate between clarifiers and separators. 04
(c) Discuss the factors affecting gravity separation of liquid food products. 07
OR
Q.4 (a) Write short notes on Bactofugation treatment. 03
(b) Draw a neat and well labeled HTST pasteurization processing representation along
with product flow and accessories/equipments in place.
04
(c) Enlist different types of material fouling on heat exchanger. Discuss the factors
affecting fouling.
07
Q.5 (a) Highlight on leaching and its application in food industry. 03
(b) Write short notes on double pipe scrapped surface crystallizer. 04
(c) What do you understand by cake filtration? State the significance of filter aid in
filtration.
07
OR
Q.5 (a) Highlight on immersion freezing and its application. 03
(b) What do you understand by IQF freezing and Air blast freezing? 04
(c) Derive an equation for recovery of two stage liquid ? liquid extraction process. Sketch
out and explain equilateral triangular diagram for single stage extraction.
07
*************
www.FirstRanker.com www.FirstRanker.com
www.FirstRanker.com
FirstRanker.com - FirstRanker's Choice
This post was last modified on 20 February 2020