Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 5th Sem New 2150404 Principles Of Process Engineering Ii Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? V (New) EXAMINATION ? WINTER 2019
Subject Code: 2150404 Date: 21/11/2019
Subject Name: Principles of Process Engineering-II
Time: 10:30 AM TO 01:00 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) Discuss local and overall mass transfer coefficients. 03
(b) Differentiate between packed tower v/s tray tower. 04
(c) Oxygen (A) is diffusing through carbon monoxide (B) under steady state
condition with the carbon monoxide non diffusing. The total pressure is 1
x 10
5
N/m
2
, and the temperature 0
o
C. The partial pressure of oxygen at
two planes 2 mm apart is, respectively 13000 and 6500
N/m
2
.Thediffusivityforthemixtureis1.87x10
-5
m
2
/s. Calculate the rate of
diffusion of oxygen in kmol/s through each square meter of the two planes.
07
Q.2 (a) Define: (i) Tie-line (ii) Operating line (iii) Raffinate 03
(b) What are different types of packing. 04
(c) Derive Fick?s law of diffusion and explain N
A
and J
A.
Also prove
that
For unidirectional binary diffusion J
A
=-J
B.
07
OR
(c) Differentiate between direct and indirect mass transfer operations with
examples.
07
Q.3 (a) Discuss construction and working of sparged vessel. 03
(b) Explain the following terms with respect to tray
towers:
(i) Flooding (ii) Theoretical tray (iii) Coning (iv) Tray spacing
04
(c) Explain counter current multiple contact, Shanks system for leaching with
neat figure.
07
OR
Q.3 (a) Explain steps to determine minimum liquid to gas ratio for absorbers. 03
(b) Explain criteria of solvent selection for extraction. 04
(c) A packed tower is designed to recover 98% CO
2
from a gas mixture
containing 10% CO
2
and 90% air using water. A relationy=14x can be
used for equilibrium conditions where, y=kgCO
2
/kg dry air and x=kg
CO
2
/kg water. The water to gas rate is kept 30% more than the minimum
value. Calculate the height of the tower if (HTU)
OG
is 1 meter.
07
Q.4 (a) Explain preparation of solids for leaching. 03
(b) Write short note on Bollman extractor. 04
(c) Discuss in detail about Film theory for mass transfer coefficient. 07
OR
Q.4 (a) Explain the following terms with respect to tray
towers:
(i) weeping (ii) dumping (iii) tray spacing
03
(b) Write short note on gas absorption with chemical reaction. 04
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? V (New) EXAMINATION ? WINTER 2019
Subject Code: 2150404 Date: 21/11/2019
Subject Name: Principles of Process Engineering-II
Time: 10:30 AM TO 01:00 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) Discuss local and overall mass transfer coefficients. 03
(b) Differentiate between packed tower v/s tray tower. 04
(c) Oxygen (A) is diffusing through carbon monoxide (B) under steady state
condition with the carbon monoxide non diffusing. The total pressure is 1
x 10
5
N/m
2
, and the temperature 0
o
C. The partial pressure of oxygen at
two planes 2 mm apart is, respectively 13000 and 6500
N/m
2
.Thediffusivityforthemixtureis1.87x10
-5
m
2
/s. Calculate the rate of
diffusion of oxygen in kmol/s through each square meter of the two planes.
07
Q.2 (a) Define: (i) Tie-line (ii) Operating line (iii) Raffinate 03
(b) What are different types of packing. 04
(c) Derive Fick?s law of diffusion and explain N
A
and J
A.
Also prove
that
For unidirectional binary diffusion J
A
=-J
B.
07
OR
(c) Differentiate between direct and indirect mass transfer operations with
examples.
07
Q.3 (a) Discuss construction and working of sparged vessel. 03
(b) Explain the following terms with respect to tray
towers:
(i) Flooding (ii) Theoretical tray (iii) Coning (iv) Tray spacing
04
(c) Explain counter current multiple contact, Shanks system for leaching with
neat figure.
07
OR
Q.3 (a) Explain steps to determine minimum liquid to gas ratio for absorbers. 03
(b) Explain criteria of solvent selection for extraction. 04
(c) A packed tower is designed to recover 98% CO
2
from a gas mixture
containing 10% CO
2
and 90% air using water. A relationy=14x can be
used for equilibrium conditions where, y=kgCO
2
/kg dry air and x=kg
CO
2
/kg water. The water to gas rate is kept 30% more than the minimum
value. Calculate the height of the tower if (HTU)
OG
is 1 meter.
07
Q.4 (a) Explain preparation of solids for leaching. 03
(b) Write short note on Bollman extractor. 04
(c) Discuss in detail about Film theory for mass transfer coefficient. 07
OR
Q.4 (a) Explain the following terms with respect to tray
towers:
(i) weeping (ii) dumping (iii) tray spacing
03
(b) Write short note on gas absorption with chemical reaction. 04
2
(c) Derive equation for material balance for single stage countercurrent leaching. 07
Q.5 (a) Explain fick?s law of diffusion. 03
(b) Explain criteria of solvent selection for gas absorption. 04
(c) Write short note on Rotocell extractor with neat sketch. 07
OR
Q.5 (a) Enlist industrial applications of gas absorption and leaching. 03
(b) Explain different components of tray tower. 04
(c) Explain with a neat sketch the material balance for multi-stage liquid-
liquid extraction.
07
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This post was last modified on 20 February 2020