M.Sc. (Semester III) (CBCS) Examination Nov/Dec-2018
Industrial Chemistry
UNIT OPERATIONS OF CHEMICAL ENGINEERING
Time: 2½ Hours
Max. Marks: 70
Instructions: All questions are compulsory. All questions carry equal marks.
Q.1
Multiple choice questions.
14
The heat exchange Equipments involves heat energy transfer by mode.
Conduction
Convection
Radiation
All of these
is heat exchange equipment used to meet latent heat requirement at the bottom off distillation column.
Heater
Reboiler
Vaporiser
Evaporator
In the backward flow multiple effect Evaporator, the flow of solution to be concentrated is in direction to that of steam.
Parallel
Opposite
Both a b
Not specific
principle is used in the operation of Blake Jaw Crusher.
Impact
Compression
Both, a b
Crushing
In Liquid- Liquid extraction mass transfer takes place
Feed solution to solvent
Solvent to feed solution
Vapour to solvent
Liquid phase to solid phase
The word "Miscella" is used for
Solution of oil in solvent containing a small amount of finely divided suspended solids.
Diluted solution of oil in solvent
Both a b
Solution of solvent in oil
The unit operation extraction is used in case of
When separation by distillation
Close boiling mixture
Substance cannot withstand at its boiling even under vacuum
All of these
The separation of solid from a suspension in a liquid with help of porous medium of screen is called as
Evaporation
Drying
N
Filtration
Extraction
In the filter, filtration-washing-partial drying-discharge takes place simultaneously.
Plate and frame
Rotary drum
Leaf
Centrifugal
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10) Theory gives definite relationship between at which crystals will spontaneously form in a pure solution.
Solubility and Temperature
Concentration and temperature
Concentration and volume
Concentration and pressure
11) Distribution of two separate phases randomly through one another is called
Mixing
Grinding
Crushing
Conveying
12) In the ball mill, faster the material is fed into the mill, will be the product.
Coarser
Finer
Both a b
Very fine
13) For fine particles the unit is
Distance between adjacent wire
Number of opening per linear inch
Number of opening per linear cm
Number of opening per linear meter
14) Steam distillation is used for separation of liquid.
Low boiling
Viscous
High boiling
Both a &c
Q.2

Answer the following (Any four)
08
What is the role of Heater and Cooler in heat exchange equipment?
What is meant by entrainment?
Write criteria for solvent to be used in extractive distillation.
What are the different Grizzlies used in Chemical Industries?
Draw neat and labeled sketch of Dorr Agitator.

Write notes on (Any two)
06
Rotating Disc Contactor (R. D.
Oslo cooling crystallizer
Cyclone separator
Q.3

Answer the following(Any two)
08
Give an account of Tray Dryer.
Write construction of continuous vacuum crystallizer with neat and labeled sketch.
Give a brief account on working aspects of Hammer Mill.

Answer he following (Any one)
06
Explain in detail construction and working of Long tube Evaporator.
Discuss with phase diagram Benzene-toluene vapor- liquid equilibria
Q.4

Answer the following (Any two)
10
Discuss construction and working of Forced circulation Evaporator.
Explain Impellers with respect to turbine type.
Discuss with neat labeled diagram centrifugal filter with its applications.
b)Answer the following (Any one)
04
Explain Bubble Cap and Sieve Valve used in distillation Column.
Discuss in details Azeotropic Distillation.
Q.5
Answer the following (Any Two)
14
a)Draw schematic of Bollman extractor and explain its construction and working in detail.
b)Draw a neat labeled sketch and explain Kettle type reboiler with floating head arrangement.
c)Explain continuous counter current decantation of fine solids.