Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 7th Sem New 21735092173514 Environmental Reaction Engineering Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VII(NEW) EXAMINATION ? SUMMER 2019
Subject Code:2173509/2173514 Date:16/05/2019
Subject Name:Environmental Reaction Engineering
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.
MARKS
Q.1 (a) Define: 1) space time, 2) space velocity, 3) Recycle ratio 03
(b) Discuss size comparison of mixed flow reactor and plug flow
reactor for n
th
order reaction.
04
(c) Derive the process design equation for mixed flow reactor. 07
Q.2 (a) Discuss advantages and disadvantages of batch reactor. 03
(b) Justify that CSTRs connected in parallel behave as one single
CSTR of the same total volume.
04
(c) Explain size comparison of MFR and PFR in detail. 07
OR
(c) Derive the process design equation for PFR. 07
Q.3 (a) Explain instantaneous fractional yield and overall fractional
yield.
03
(b) For following parallel reactions
A R
A S
If R is the desired product and the order of reaction is same for
both the reactions then how can one get more production of R?
04
(c) Prove that N number of same sized mixed flow reactors in series
can be approximated as a plug flow reactor.
07
OR
Q.3 (a) Prove that N number of same sized mixed flow reactors in series
can be approximated as a plug flow reactor.
03
(b) For reactions in series
A R S
If the desired product is S then explain which method should
be used?
(c) What are the reasons for exit age distribution? What are the
techniques to evaluate the RTD?
07
Q.4 (a) Define mean residence time and variance with equation. 03
(b) Explain pulse input experiment for RTD studies. 04
(c) The data given below represent a continuous response to a
pulse input into a closed vessel which is to be used as a
chemical reactor. Calculate the mean residence time of fluid in
the vessel and tabulate and construct the E curve.
07
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VII(NEW) EXAMINATION ? SUMMER 2019
Subject Code:2173509/2173514 Date:16/05/2019
Subject Name:Environmental Reaction Engineering
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.
MARKS
Q.1 (a) Define: 1) space time, 2) space velocity, 3) Recycle ratio 03
(b) Discuss size comparison of mixed flow reactor and plug flow
reactor for n
th
order reaction.
04
(c) Derive the process design equation for mixed flow reactor. 07
Q.2 (a) Discuss advantages and disadvantages of batch reactor. 03
(b) Justify that CSTRs connected in parallel behave as one single
CSTR of the same total volume.
04
(c) Explain size comparison of MFR and PFR in detail. 07
OR
(c) Derive the process design equation for PFR. 07
Q.3 (a) Explain instantaneous fractional yield and overall fractional
yield.
03
(b) For following parallel reactions
A R
A S
If R is the desired product and the order of reaction is same for
both the reactions then how can one get more production of R?
04
(c) Prove that N number of same sized mixed flow reactors in series
can be approximated as a plug flow reactor.
07
OR
Q.3 (a) Prove that N number of same sized mixed flow reactors in series
can be approximated as a plug flow reactor.
03
(b) For reactions in series
A R S
If the desired product is S then explain which method should
be used?
(c) What are the reasons for exit age distribution? What are the
techniques to evaluate the RTD?
07
Q.4 (a) Define mean residence time and variance with equation. 03
(b) Explain pulse input experiment for RTD studies. 04
(c) The data given below represent a continuous response to a
pulse input into a closed vessel which is to be used as a
chemical reactor. Calculate the mean residence time of fluid in
the vessel and tabulate and construct the E curve.
07
2
t, min Cpulse , g/l
0 0
5 3
10 5
15 5
20 4
25 2
30 1
35 0
OR
Q.4 (a) Differentiate between physical and chemical adsorption. 03
(b) Explain relationship between E and F curve. 04
(c) A sample of tracer hytane was injected as a pulse into a vessel
(to be used as a reactor) and the effluent concentration is
measured as a function of time. The following data are
obtained:
t,min C (g/m
3
)
0 0
1 1
2 5
3 8
4 10
5 8
6 6
7 4
8 3
9 2.2
10 1.5
12 0.6
14 0
Construct the C and E curves and determine the fraction of
material leaving the vessel that has spent between 3 and 6 min
in the vessel.
07
Q.5 (a) Define: i) heterogeneous reaction, ii) catalyst, iii) Catalyst
activity
03
(b) Differentiate between packed bed reactor and fluidized bed
reactor.
04
(c) Write the sequence of steps according to shrinking core model for
gas-solid non-catalytic reactions. Draw a schematic figure to show
these steps when reaction A (g) + bB (s) ? products takes place
on a solid spherical particle of unchanging size.
07
OR
Q.5 (a) Differentiate constant volume and variable volume batch
reactor.
03
(b) Explain types of catalyst deactivation. 04
(c) Qualitative discussion about product distribution in reactions in
parallel for two reactant.
07
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This post was last modified on 20 February 2020