My Profile
Active Members
TodayLast 7 Days
more...
Awards & Gifts
Online Exams
Fresher Jobs
Our fresher job section is exclusively for fresh graduates! Find jobs for freshers in major Indian
cities including Bangalore, Chennai, Hyderabad, Pune or Kochi
Resources
Find educational articles, blogs, discussion threads and other resources.
Colleges
Find details about any college in India or search for courses.
|
Download Model question papers & previous years question papers
|
Posted By: sunil Member Level: Diamond Posted Date: 02 Jul 2008
|
2007 Jawaharlal Nehru Technological University Chemical engineering IV B.Tech II Semester Regular Examinations, Apr/May 2007 OPTIMIZATION OF CHEMICAL PROCESS Question paper
|
|
|
Code No: RR420805
Set No. 1
IV B.Tech II Semester Regular Examinations, Apr/May 2007
OPTIMIZATION OF CHEMICAL PROCESS
(Chemical Engineering)
Time: 3 hours
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
Max Marks: 80
1. For a two stage adiabatic compressor, where the gas is cooled to the inlet gas
temperature between stages, the theoretical work is given by :
W = {kp1V1/(k - 1)}[(p2/p1){(k-1)/k}-2 + (p3/p2){(k-1)/k}]
where k = CP/CV,1p1= inlet pressure,p2 = intermediate stage pressure,
p3= outlet pressure andV1 = inlet volume.
We have to optimize the intermediate pressurep2 so that the work is minimum.
Show that ifp1 = 1atm. andp3 = 4 atm, p2opt = 2 atm.
[16]
2. Describe two commonly used models of reactors along with their governing equa-
tions
3. Does the following sets of constraints form convex region ?
g1(x) = -(x12+x22) + 9 = 0
g2(x) =g2(x) = -x1-x2+1 = 0
4. Maximize y = x1+3x2-x3
subject to x1 + 2x2 + x3 = 4
2x1 + x2= 5
x1, x2, x3 = 0
[16]
[16]
using the simplex method ?nd the optimize optimum values of x1, x2, x3 and y
solve the problem by 1) guessing to obtain an initial basis 2) Using a phase I or
phase II method
[16]
5. Obtain an expression for the optimum temperature of the working ?uid to be used
in a power system for recovery of waste heat from a boiler. Draw a neat schematic
diagram of the power system.
[16]
6. (a) Discuss about the classi?cation of optimization problems for steady state dis-
tillation.
(b) describe how the nonlinear regression technique(least squares) can be used to
?t vapor-liquid equilibrium data. Use van Laar model with two adjustable
parameters to correlate the VLE data.
7. The cost function C representing the annual costs of a pipe line transporting a ?uid
is given by C = C1D1.3L + 0.142(C0/? )m2.8m0.2 ?-2.0D-4.8L
where the cost coe?cients are considered as C0= Rs.0.59andC1= Rs.5.7.The mass
?ow rate of ?uid m = 25 kg/s, density r = 1000kg/m3, m = 1.08x10-3N/sm2, the
pumping e?ciency ?= 0.60and the pipe length L= 10 m. The ?uid velocity is
correlated by v = 4m/(? Q D2) Find the optimal pipe diameter Doptand optimal
?uid velocity vopt.
[16]
8. The steady state monod chemostat model for substrate mass balance and cell mass
balance is described by the following equations : D(sf- s) -yx/sµmax(s+sxKs)= 0
hµKmaxs+Ss - Di x + Dxf= 0
where x and s are cell and substrate concentrations, respectively and D is the dilu-
tion rate. The parameter values are: maximum speci?c growth ratemax= 1.0h-1,
yield factor Yx/s= 0.5,substrate growth rate constant Ks= 0.2g/lit,substrate feed
concentration sf= 10.0g/litand initial cell concentration xf= 0. The objective is to
?nd the optimal value of D that provide maximum cell production Dx. Obtain the
steady state solution for x and s as a function of D, 0 = D = 1.0and ?nd the value
of D that provide maximum cell production Dx.
Return to question paper search
|
|
|
Submit Previous Years University Question Papers and make money from adsense revenue sharing program
Are you preparing for a university examination? Download model question papers
and practise before you write the exam.
|
Watch TV Channels
|