I C-GEQ-0-DIFB I

CHEMICAL ENGINEERING
Paper-II


j Time Allowed Three Hours
IMaximum Marks 200 I

Question Paper Specific Instructions

Please read each of the following instructions carefully before attempting
questions:

There are EIGHT questions in all, out of which FIVE are to be attempted.

Questions no. 1 and 5 are compulsory. Out of the remaining SIX questions, THREE are to
be lattempted selecting at least ONE question from each of the two Sections A and B.
Attempts of questions shall be counted in sequential order. Unless struck off, attempt of a

question shall be counted even if attempted partly. Any page or portion of the page left


in the Question-cum-Answer Booklet must be clearly struck off
All questions carry equal marks. The number of marks carried by a question I part is
indicated against it.

Answers must be written in ENGLISH only.
Unless otherwise mentioned, symbols and notations have their usual standard meanings.
Assume suitable data, if necessary, and indicate the same clearly.
Neat sketches may be drawn, wherever required.

SECTION A

QI.
Answer each of the following questions 5x8=40


Explain the merits and demerits of oxycombustion versus regular
combustion of fuels. 5

Give one example each of bypass, recycle and purge in a chemical flow
reacting system, and explain their importance. 5
What is meant by fuel NOx and thermal NOx How are they



Explain the importance of Le Chatelier's priniciple with an example. 5

Write the Vapour · Liquid equilibrium equation for a system having
non-ideality only in the gas phase. 5
C-GEQ-0-DIFB
1



Explain the term Coefficient of Performance m refrigeration
systems.
5

Explain the main difference between plug flow reactor and continuous
stirred tank reactor.
5


When are semi-batch reactors preferred over batch reactors
5

Q2.
A heat exchanger is used to heat up a process stream. The configuration
has a bypass of the process stream as shown below

Heating in

Tin Fstream
Tout, F stream

I

Heating out

The mass flow rate of the process stream is F and gets split with a

stream
fraction a. as bypass. Given that the process stream has a specific heat of

Cand a fixed amount of heat Q is delivered by the heating medium,

P
estimate the outlet temperature of the process stream as a function of a. 20


What are the desirable properties of a refrigerant that are typically used
in a refrigeration cycle? 10

What is a Horton sphere? What is it used for and why? 10
Q3.
Using an example, explain what is reactive distillation. What are the
requirements for reactive distillation to be feasible 10


A spherical coal particle with 40% ash (uniformly distributed) is to be
burnt. Describe the phenomena in the following two cases 20
Combustion is controlled by diffusion of oxygen in the surrounding air.

Combustion is controlled by diffusion of oxygen in the ash layer.
A binary vapour mixture of benzene and toluene containing x mole
fraction of benzene is cooled at constant pressure P. Outline the method
to estimate the dew point of the mixture and the liquid phase
composition.
10

C-GEQ-0-DIFB
2



Q4.
Explain the term chemical potential and its use.


How is power generated in a thermal power plant? Explain with a neat
diagram(s). 15

Two waste streams, the first containing 100 m3 per hour of O· l N HCI,
and the second containing 200 m3 per hour of 1 N HN03, are charged
into a neutralization pit having volume 1000 m3 . Estimate the flow rate
of 1 N base that would be needed to enable acceptable discharge from
the neutralization pit. 15




C-GEQ-0-DIFB
3



SECTION B
Answer each of the following questions 5x8;::.40
Explain why and when biomass gasification would be preferred over
combustion. 5
What are the major solid wastes from forests How would you use or
dispose them 5
Explain the molecular level aspects that provide cleansing action in
soaps and detergents. 5
Explain what is meant by Global Warming Potential (GWP). Arrange
the following in increasing order of their GWP 5
Steam, Methane, CO2.
What is flyash What are its sources and what is its environmental
.... 5
Explain the factors that influence optimal design of waste heat recovery
systems. 5
What are the important sinks of CO2 Explain the role of forests as
sources/sinks of CO2.
What is steam reforming of methane What is it used for
5
5
Explain the process of cement production with a neatly labelled
diagram. 15
Explain what is meant by first generation biofuels. What are the
drawbacks of these fuels 10
Write a brief note on PERT/CPM. 15
Explain the process of producing ethylene using a neatly labelled flow
diagram. 15
Describe the process of production of bio-diesel via trans-esterification of
fatty acids/oils. 15
Outline the different methods of asset depreciation and analyze their
impact on determining the profitability and payback.
Explain the steps in the production of ammonia from the Haber Process
using a neatly labelled flow diagram.
10
15
Describe two methods of air pollution control. Compare the treatment
methods. 15
Explain the discounted cash flow method for assessing the profitability
of a project.
·
10
4
............................................................................ ..........
SECTION B
Answer each of the following questions 5x8;::.40
Explain why and when biomass gasification would be preferred over
combustion. 5
What are the major solid wastes from forests How would you use or
dispose them 5
Explain the molecular level aspects that provide cleansing action in
soaps and detergents. 5
Explain what is meant by Global Warming Potential (GWP). Arrange
the following in increasing order of their GWP 5
Steam, Methane, CO2.
What is flyash What are its sources and what is its environmental
.... 5
Explain the factors that influence optimal design of waste heat recovery
systems. 5
What are the important sinks of CO2 Explain the role of forests as
sources/sinks of CO2.
What is steam reforming of methane What is it used for
5
5
Explain the process of cement production with a neatly labelled
diagram. 15
Explain what is meant by first generation biofuels. What are the
drawbacks of these fuels 10
Write a brief note on PERT/CPM. 15
Explain the process of producing ethylene using a neatly labelled flow
diagram. 15
Describe the process of production of bio-diesel via trans-esterification of
fatty acids/oils. 15
Outline the different methods of asset depreciation and analyze their
impact on determining the profitability and payback.
Explain the steps in the production of ammonia from the Haber Process
using a neatly labelled flow diagram.
10
15
Describe two methods of air pollution control. Compare the treatment
methods. 15
Explain the discounted cash flow method for assessing the profitability
of a project.
·
10
4
............................................................................ ..........
Q5.







Q6.



Q7.



QB.


C-GEQ-0-DIFB