GTU BE/B.Tech 2018 Winter Question Papers || Gujarat Technological University
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII (OLD) EXAMINATION — WINTER 2018
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Subject Code: 170501 Date: 03/12/2018
Subject Name: Chemical Reaction Engineering - I
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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| Q.1 | (a) | Give classification of chemical reactions with examples. | 07 |
| (b) | Differentiate Differential and Integral method of analysis for finding rate of reaction. | 07 | |
| Q.2 | (a) | Discuss and compare various theories for dependency of activation energy on temperature. | 07 |
| (b) | Derive rate equation for second order irreversible reaction using integral method of analysis. Reaction is 2A —> R | 07 | |
| OR | |||
| (a) | Discuss the relationship between C, E and F curve. | 07 | |
| (b) | Derive performance equation for ideal batch reactor. | 07 | |
| Q.3 | (a) | Derive equation for the RTD for ideal single CSTR. | 07 |
| OR | |||
| (a) | A homogeneous gas reaction A — 3R has a reported rate at 215°C -ra = 102Ca1/2, [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°C and 5 atm (Cao = 0.0625 mol/liter). | 07 | |
| Q.4 | (a) | Derive equation for space time for recycle reactor. | 07 |
| (b) | Write a short note on equilibrium constants from thermodynamics clearly indicating the equations. | 07 | |
| OR | |||
| (a) | With neat sketches discuss about correct recycle ratio and compare it with too high and too low recycle ratios for autocatalytic reaction. | 07 | |
| Q.5 | (a) | Discuss fractional yield; Overall yield and selectivity for parallel reaction. | 07 |
| (b) | Discuss qualitative product distribution for reaction in series A— R — S. | 07 | |
| OR | |||
| (a) | Write short note on ‘Adiabatic Operation in reactor’. | 07 | |
| (b) | Derive the performance equation for equal sized CSTRs in series. | 07 | |
| OR | |||
| (a) | Give comparison between ideal plug flow and mixed flow reactor. | 07 | |
| (b) | Write short note on ‘Searching for reaction mechanism’. | 07 |
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