GTU B.Tech 2020 Winter Question Papers || Gujarat Technological University
Seat No.: Enrolment No.
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE- SEMESTER-V (NEW) EXAMINATION — WINTER 2020
Subject Code:3150405 Date:29/01/2021
Subject Name:Chemical Engineering Fundamentals I1
Time:10:30 AM TO 12:30 PM Total Marks: 56
Instructions:
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- Attempt any FOUR questions out of EIGHT questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
| Q.1 | (a) Define Molecular and eddy diffusion with examples. | 03 |
| (b) Explain criteria of solvent selection for gas absorption. | 04 | |
| (c) Differentiate between Direct and Indirect mass transfer operations. | 07 | |
| Q.2 | (a) Define the following terms: 1) order of reaction (i1) elementary and non-elementary reactions | 03 |
| (b) Explain temperature and pressure dependency of diffusivity of gases and liquids | 04 | |
| (c) For a given liquid flow rate give step wise procedure to calculate minimum liquid to gas ratio for absorbers. | 07 | |
| Q.3 | (a) Define rate of reactions in different useful ways. | 03 |
| (b) Derive performance equation for an ideal batch reactor. | 04 | |
| (c) Derive equation for material balance for single stage countercurrent leaching. | 07 | |
| Q.4 | (a) Define various k-type mass transfer coefficients along with formula and units | 03 |
| (b) Define and give physical significance of Reynolds No. and Prandtl No. | 04 | |
| (c) State different theories explaining the meaning of mass transfer coefficients. Explain any one in detail. | 07 | |
| Q.5 | (a) Discuss Molecularity. Mention the general formulae for the unit of rate constant k. | 03 |
| (b) Derive the performance equation of recycle plug flow reactors. | 04 | |
| (c) The rate constant of a reaction is measured at different temperatures is reported below. Calculate the activation energy for this reaction. Temperature, K 273 293 303 313 --- Content provided by FirstRanker.com --- Rate constant, k, sec\[.2.46 x 10° | 47.5x 10° 576 x 10° 5480 x 10° | 07 | |
| Q.6 | (a) Explain concept-of effective diffusivity. | 03 |
| (b) Explain the concept of equilibrium in case of interphase mass transfer. | 04 | |
| (c) Describe “two resistance theory” of interphase mass transfer in brief. | 07 | |
| Q.7 | (a) Explain space time, space velocity and holding time. | 03 |
| (b) Liquid A decomposes by first order kinetics, and in a batch reactor 50% of A is converted in 5 minutes. How long it will take to reach 75% conversion? | 04 | |
| (c) Write a short note on differential method and integral method of analysis of kinetic data. | 07 | |
| Q.8 | (a) Explain Fick’s law in diffusion through solids | 03 |
| (b) Explain industrial applications of liquid extraction. | 04 | |
| (c) Discuss the system of three liquids — one pair partially soluble on ternary Equilibria for liquid extraction. | 07 |
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