Janardan Rai Nagar Rajasthan Vidyapeeth 2006 B.Tech Biotechnology TRANSPORT PROCESS- II - Question Paper
JRN Rajasthan Vidyapeeth University
BIOTECHNOLOGY
SEMESTER 4
TRANSPORT PROCESS- II
Model Question Paper
BSBT8- TRANSPORT PROCESS- II
Time : 3 hrs Maximum marks : 75
Instruction:
1. Question paper is divided into Group A, Group B and Group C
2. Each Group is 25 Marks
3. Figure to the right in bracket indicates marks.
4. Good Handwriting is expected
5. Assume suitable data if necessary.
Group A (25 Marks)
Answer any three questions (Question 1 is compulsory)
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(10)
Q.1
Explain
Ficks Law for Molecular Diffusion ?
Q.2 Describe convective mass transfer and write about various types of Mass- Transfer
(10)
Coefficient ?
(10)
Q.3
Explain
Laminar Flow ? Boundary Layer Theory in Mass Transfer ?
Q.4 Write in Detail :-
1. Continuous Tunnel Dryer. 2. Humidity and Humidity Chart
(10)
Q.5 Write Derivation of Basic Equation of Unsteady-state diffusion ?
Group B (25 Marks)
(5)
Answer any three questions (Questions 6 is compulsory)
Q.6 A cylindrical can of pea puree (C2) has a diameter of 68.1 mm and height of
101.6mm and is initially at a uniform temperature of 29.40C. The cans are stacked vertically
in a retort, and steam at 115.60C is admitted. For a heating time of 0.75h at 115.60C, calculate
the temperature at the centre of the can. Assume that the can is in the centre of a vertical stack
of cans and that it is insulated on at two ends by the other cans. The heat capacity of metal
wall of the can will be neglected. The heat transfer coefficient of the steam is estimated as
4540
W/m2.k . Physical properties of puree are k= 0.830 W/m.k and 
=
2.007 x 10-7 m2 /s
[ y = 0.13] ?
(10)
Q.7 Derive an equation for measurement of wet bulb temperature ?
(10)
Q.8 Discuss in detail Pasteurization ?
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Q.9 An insoluble wet granular material is dried in a pan 0.457 x 0.457 m ( 1.5 x 1.5 ft)
and 25.4 mm deep. The material is 25.4 mm deep in the pan and the sides & bottom
can be considered to be insulated. Heat transfer is by convection form an air stream
flowing parallel to the surface at a velocity of 6.1 m/s (20 fts). The air is at 65.60 c
(1500F) and has a humidity of 0.010 kg H2O/kg dry air. Estimate the rate of drying
for the constant rate period using SI & English units. ?
(10)
Q.10. Define
Evaporation . Explain in detail about methods of operation of evaporations ?
Group C (25 Marks)
All Questions are Compulsory.
Q.11 Fill in the blanks ( each question carry 2 marks)
1. If the gas humidity H is decreased for a given T of the gas then from humidity chart, the wet
bulb temperature Tw will _________.
2. _________ are indirectly heated batch dryers similar to tray dryer.
3. Some solution deposit solid materials called as ______ on the heating surfaces.
4. Distillation to separate alcohol from water involves ___________
5. Sugar tends to ___________ if kept at high temperature for longer period.
Q.11 Multiple choice question. (Each question carry 2 marks)
1. In _____ the vapor is compressed so that its condensing temperature is increased.
a) Vapor recompression Evaporator b) Multiple compression Evaporator c) Vapor decompression
evaporator d) Single compressed evaporator .
2. In actual diffusion in porous solids, the pores are not straight and cylindrical but __________
a) Regular b) Similar c) Irregular d) Dissimilar
3. The molecule collides with the wall and molecule wall collisions this type of diffusion is
called _________
a) Ficks gas diffusion b) Molecular gas diffusion c) Transition gas Diffusion
d) Knudsen gas diffusion .
4. Equation for constant and DAB, diffusion with gases the total pressure is often _______
a) Constant b) Decrease c) Increase d) None of these
5. In __________ type of evaporator , vertical rather than horizontal tubes are used.
a) Horizontal tube N.C. Evaporator b) Vertical type natural circulation evaporator
c) Pan d) Long tube vertical type evaporator.
Q.11 True or false (each question carry 1 marks).
1. In the falling rate period, the surface of the solid being dried is no longer completely wetted.
2. Fruit Juices are not heat sensitive and viscocity decreases greatly as concentration increases.
3. Stability means the errors in the solution grow exponentially as the solution proceeds.
4. Surface condensers are used when actual mixing of the condensate with condenser cooling
water is not desire.
5. The penetration theory was derived for diffusion into a laminar falling film for short short
contact times.
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| Earning: Approval pending. |
