GTU BE 6th Semester 162304 Reaction Engineering and Rheology Summer 2018 Question Paper

1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE – SEMESTER ?VI (OLD) – EXAMINATION ? SUMMER 2018
Subject Code:162304 Date:03/05/2018
Subject Name:Reaction Engineering & Rheology
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.
Q.1 (a) With neat sketch explain Batch Reactor. 07
(b) What is Rheology? Explain Polymer Rheology in detail. 07

Q.2 (a) Define: Homogenous reaction; bingham plastic; activation energy; chemical
kinetics; die swell; non elementary reaction; thixotropic.
07
(b) Discuss in detail Non-Newtonian fluids. 07
OR
(b) What is Arrhenius Law? Discuss it significance. 07

Q.3 (a) What is Free volume or Molecular Hole concept? Discuss. 07
(b) Discuss Capillary Rheometer & its importance in Rheological studies. 07
OR
Q.3 (a) Answer the following:- (i) Explain creep & Relaxation of typical plastics
The rate constants of a certain reaction are 1.6×10
-3
& 1.625×10
-2
(s)
-1
at 10?C
& 30?C. Calculate the activation energy
07
(b) Derive Power Law & WLF equation. 07

Q.4 (a) Discuss Maxwell model in detail? 07
(b) What is Tank Reactor? Explain Continuous Stirred Tank Reactor (CSTR). 07
OR
Q.4 (a) Explain MFI & Die swell in detail with neat sketch. 07
(b) Explain the correlation between Boltzmann Principle with Time Temperature
Superposition.
07

Q.5 (a) Discuss Weissenberg effects. 07
(b) Discuss how crystanillity & Tg effect molecular orientation of polymer 07
OR
Q.5 (a) Explain Optical Birefringence method. 07
(b) Explain Cone & Plate viscometer. 07
*************