Download GTU B.Tech 2020 Winter 5th Sem 3150405 Chemical Engineering Fundamentals Ii Question Paper

Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 5th Sem 3150405 Chemical Engineering Fundamentals Ii Previous Question Paper

Seat No.: ________
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?V (NEW) EXAMINATION ? WINTER 2020
Subject Code:3150405 Date:29/01/2021
Subject Name:Chemical Engineering Fundamentals II
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.
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:
03
i) order of reaction (ii) elementary and non-elementary reactions

(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
07
gas ratio for absorbers.



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 Prandlt No.
04

(c) State different theories explaining the meaning of mass transfer coefficients. Explain
07
any one in detail.



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
07
below. Calculate the activation energy for this reaction.
Temperature, K
273
293
303
313
Rate constant, k, sec-1 2.46 x 105
47.5 x 105
576 x 105
5480 x 105



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
04
converted in 5 minutes. How long it will take to reach 75% conversion?

(c) Write a short note on differential method and integral method of analysis of kinetic
07
data.



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
07
for liquid extraction.

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