Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 7th Sem 2173612 Fundamentals Of Reaction Engineering Previous Question Paper
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?VII (NEW) EXAMINATION ? WINTER 2020
Subject Code:2173612 Date:28/01/2021
Subject Name:Fundamentals of Reaction Engineering
Time:10:30 AM TO 12:30 PM Total Marks: 56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Explain the temperature dependent term of rate equation from Arrhenius law.
03
(b) Define and Explain, Rate and Molecularity of the reaction.
04
(c) Consider a feed CA0=100, CB0=200, Ci0=100 to a steady flow reactor. The
07
isothermal gas phase reaction is A+3B6R If CA=40 at the reactor exit
what is CB, XA, and XB there? Notations have their conventional meanings.
Q.2 (a) On doubling the concentration of reactant, the rate of reaction triples. Find the
03
reaction order
(b) Explain the different types of reaction with proper example of each type.
04
(c) The aqueous reactions A R+S proceeds as follows
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Time,
0
36
65
100
160
min
CA,
0.1823
0.1453
0.1216
0.1025
0.0795
0.0494
mol/lt
With CA0 = 0.1823 mol/lt, CR0 = 0, CS0 = 55 mol/lt. Find the rate equation for
this reaction
Q.3 (a) Milk is pasteurized if it is heated to 63 0C for 30 min, but if it is heated to 74
03
0C it only needs 15 s for the same result. Find the activation energy of this
sterilization process.
(b) The reaction between nitric oxide and oxygen 2 NO + O2 2 NO2 follows the rate
04
law d [O2] /dt = k [NO]2 [O2] Suggest a reaction mechanism which is consistent
with this rate law.
(c) Derive the integrated rate equation for zero order reaction for a variable volume
07
system.
Q.4 (a) Liquid A decomposes by second order kinetics, and in a batch reactor 50%
03
of A is converted in a 5 minute run. How much longer would it take to
reach 75% conversion?
(b) How will you compare the performance of single batch reactor with the
04
flow reactor and mixed versus plug flow reactor for a first order reaction?
(c) What are the different types of ideal reactors? Derive the performance
07
equation of steady state mixed flow reactor.
1
Q.5 (a) Explain the significance of space time and space velocity
03
(b) Derive the performance equation of the plug flow reactor.
04
(c) A homogenous gas reaction A 3R has a reported rate at 215 0C
07
-rA= 10-2 CA 1/2 [ mol/lit sec]
Find the space time needed for 80% conversion of a 50% A-50% inert feed
to a plug flow reactor operating at 215 0C and 5 atm (CA0=0.0625 mol/liter).
Q.6 (a) Explain differential method of analysis to find kinetics of any reaction of nth
03
order.
(b) Define autocatalytic reactions. Derive an expression to find its kinetics.
04
(c) An irreversible bimolecular type reaction A+BP is taking place in a
07
constant volume batch reactor. Derive an expression for estimating
conversion at any time `t'.
Q.7 (a) Derive an expression to find kinetics of 1st order reaction taking place in a
03
variable volume batch reactor.
(b) How mixing of different composition of fluid is the key to the formation of
04
intermediate for irreversible reactions in series? Discuss in detail the
qualitative product distribution for series reaction.
(c) Derive the CRmax for the reaction first order followed by zero-order reaction
07
for
A---k1R--k2S
Q.8 (a) Derive the performance equation of the Batch reactor.
03
(b) Derive an equation of equal size mixed flow reactors connected in series for
04
first order reaction
(c) What do you understand by instantaneous fractional yield and overall
07
fraction yield of a product? Give different contacting patterns for different
concentration of reactant.
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This post was last modified on 04 March 2021