GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VII (New) EXAMINATION — WINTER 2019
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Subject Code: 2173514 Date: 28/11/2019
Subject Name: Environmental Reaction Engineering
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| MARKS | |
|---|---|
| Q.1 (a) Differentiate order and molecularity of a reaction | 03 |
| (b) On doubling the concentration of reactant, rate of reaction triples. Find the reaction order. | 04 |
| (c) Explain how different theories predict temperature dependency of reaction rate | 07 |
| Q.2 (a) Discuss Integral method for analysis of rate data. | 03 |
| (b) Derive the integrated form of rate expression for Irreversible unimolecular type Second order reactions. | 04 |
| (c) The halflife period for a certain first order reaction is 2.5 x 10° sec. How long will it take for 1/4™ of reactant to be left behind. | 07 |
| OR | |
| (c) A polymerization reaction occurs at constant temperature in a homogeneous phase. For initial monomer concentrations of 0.3, 0.5 and 0.9 mol/l, 30% of monomer reacts in 40 minutes. Find the reaction rate. | 07 |
| Q.3 (a) How overall order of a reaction can be estimated from half-life method? | 03 |
| (b) What is variable volume reactor | 04 |
| (c) Prove that for a first order reaction N-CSTRs connected in series will approximate to the behavior of PFR. | 07 |
| OR | |
| Q.3 (a) Specify how holding time and spacetime varies for flow reactors. | 03 |
| (b) In an isothermal batch reactor.70% of reactant A is converted in 13 minutes. Find the space time and space velocity to effect this conversion in a plug flow reactor assuming first order kinetics. | 04 |
| (c) Discuss the case of qualitative product distribution and concentration levels to be maintained in case of parallel competing unimolecular reactions of desired and undesired reactions considering their order. | 07 |
| Q.4 (a) Specify the differences between ideal and non-ideal reactors | 03 |
| (b) How E curve can be determined though pulse input experiments? | 04 |
| (c) Calculate the mean residence time for a reactor from following data t, min 0 1 2 3 4 5 6 7 8 E,min! |0 0.02 {0.10 | 0.16 | 0.20 | 0.12 | 0.08 [ 0.03 |0 | 07 |
| OR | |
| Q.4 (a) What should be essential properties a catalyst? | 03 |
| (b) Write the steps involved in a Catalytic reaction. | 04 |
| (c) Synthesize a rate law for the decomposition of Cumene to form benzene and propylene considering that surface reaction is rate limiting step. | 07 |
| Q.5 (a) Relate the mass fraction of species in a mixture to its total flux | 03 |
| (b) What is meant by Mass transfer boundary layer thickness? | 04 |
| (c) Calculate the mass flux of reactant A to a single catalyst pellet of 1 cm in diameter suspended in a liquid. The reactant is placed in dilute concentrations and reaction is considered to take place instantaneously at external pellet surface. The bulk concentration of reactant is 1 M and free system liquid velocity is 0.1 m/s. The kinematic viscosity is 0.5 cS and the liquid diffusivity is 10^-19 m^2/s. | 07 |
| OR | |
| (a) What is Thiele Modulus? Specify the importance of this factor in a catalytic reaction. | 03 |
| (b) Discuss the correlation between Effective diffusivity and tortuosity | 04 |
| (c) Correlate the time needed for complete conversion of a spherical particle considering that chemical reaction is rate governing step in shrinking core model. | 07 |
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