Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 6th Sem New 2160506 Chemical Reaction Engineering I Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI(NEW) ? EXAMINATION ? SUMMER 2019
Subject Code:2160506 Date:27/05/2019
Subject Name:Chemical Reaction Engineering - I
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.
MARKS
Q.1 (a) Explain: 1) Elementary reaction 2) Molecularity 3) Rate constant. 03
(b) Derive the equation for half-life using overall order of irreversible
reaction.
04
(c) Derive performance equation for steady state plug flow reactor. 07
Q.2 (a) Derive equation for a unimolecular type first order reaction for constant
volume batch reactor using integral method.
03
(b)
Evaluate quantitatively the behavior of N equal sized mixed flow reactors in
series.
04
(c) A homogeneous gas reaction A 3R has a reported rate at 215
O
C
-rA = 10
-2
CA
1/2
, [mol/liter sec]
Find the space-time needed for 80% conversion of a 50% A, 50% inert
feed to a plug flow reactor operating at 215
O
C and 5 atm (CAo = 0.0625
mol/liter).
07
OR
(c) Explain recycle ratio and derive the performance equation of recycle
plug flow reactors.
07
Q.3 (a) Explain space time, space velocity and holding time. 03
(b) Discuss parallel reaction with example. Also discuss fractional yield,
overall yield and selectivity for parallel reaction.
04
(c) Compare the Integral and Differential method of analysis for analyzing
reaction kinetics data.
07
OR
Q.3 (a) Explain shifting order reaction. 03
(b) Discuss autocatalytic reaction with conversion-time and rate-
concentration Curves.
04
(c) Discuss optimum temperature progression in detail. 07
Q.4 (a) Brief the rules for the best arrangement for the ideal reactors. 03
(b) Discuss Activation energy and its temperature dependency from
Arrhenius Law and Collision Theory.
04
(c) Using given data in Table, calculate the reactor volume V1 and V2 for
the mixed-flow sequence in series. when the intermediate conversion is
40% and the final conversion is 80%. The entering molar flow rate is the
0.867 mol/s.
X 0 0.1 0.2 0.4 0.6 0.7 0.8
- rA 0.0053 0.0052 0.0050 0.0040 0.0025 0.0018 0.00125
07
OR
Q.4 (a) Milk is pasteurized if it is heated to 63
O
C for 30 min, but if it is heated
to 74?C it only needs 15 s for the same result. Find the activation energy
of this sterilization process.
03
FirstRanker.com - FirstRanker's Choice
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI(NEW) ? EXAMINATION ? SUMMER 2019
Subject Code:2160506 Date:27/05/2019
Subject Name:Chemical Reaction Engineering - I
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.
MARKS
Q.1 (a) Explain: 1) Elementary reaction 2) Molecularity 3) Rate constant. 03
(b) Derive the equation for half-life using overall order of irreversible
reaction.
04
(c) Derive performance equation for steady state plug flow reactor. 07
Q.2 (a) Derive equation for a unimolecular type first order reaction for constant
volume batch reactor using integral method.
03
(b)
Evaluate quantitatively the behavior of N equal sized mixed flow reactors in
series.
04
(c) A homogeneous gas reaction A 3R has a reported rate at 215
O
C
-rA = 10
-2
CA
1/2
, [mol/liter sec]
Find the space-time needed for 80% conversion of a 50% A, 50% inert
feed to a plug flow reactor operating at 215
O
C and 5 atm (CAo = 0.0625
mol/liter).
07
OR
(c) Explain recycle ratio and derive the performance equation of recycle
plug flow reactors.
07
Q.3 (a) Explain space time, space velocity and holding time. 03
(b) Discuss parallel reaction with example. Also discuss fractional yield,
overall yield and selectivity for parallel reaction.
04
(c) Compare the Integral and Differential method of analysis for analyzing
reaction kinetics data.
07
OR
Q.3 (a) Explain shifting order reaction. 03
(b) Discuss autocatalytic reaction with conversion-time and rate-
concentration Curves.
04
(c) Discuss optimum temperature progression in detail. 07
Q.4 (a) Brief the rules for the best arrangement for the ideal reactors. 03
(b) Discuss Activation energy and its temperature dependency from
Arrhenius Law and Collision Theory.
04
(c) Using given data in Table, calculate the reactor volume V1 and V2 for
the mixed-flow sequence in series. when the intermediate conversion is
40% and the final conversion is 80%. The entering molar flow rate is the
0.867 mol/s.
X 0 0.1 0.2 0.4 0.6 0.7 0.8
- rA 0.0053 0.0052 0.0050 0.0040 0.0025 0.0018 0.00125
07
OR
Q.4 (a) Milk is pasteurized if it is heated to 63
O
C for 30 min, but if it is heated
to 74?C it only needs 15 s for the same result. Find the activation energy
of this sterilization process.
03
2
(b) Show the graphical representation of energy balance equation for
adiabatic operation.
04
(c) Derive an expression for effects of temperature on heat of reaction from
thermodynamics.
07
Q.5 (a) State the different ways to define the reaction rate 03
(b) Discuss batch reactor including its advantages and limitations. 04
(c) Discuss qualitative product distribution for irreversible first order in
series.
07
OR
Q.5 (a) Discuss variable affecting the rate of reaction. 03
(b) Experiments show that the reaction between H2(g) and I(g) to produce
HI (g) proceeds with a rate
(1/2)d[HI]/dt = k[H2] [I2]
Suggest a two step mechanism which is consistent with this rate.
04
(c) Write short note on ?Searching for reaction mechanism?. 07
*************
FirstRanker.com - FirstRanker's Choice
This post was last modified on 20 February 2020