Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 6th Sem New 2160405 Principles Of Process Engineering Iii Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI(NEW) ? EXAMINATION ? SUMMER 2019
Subject Code:2160405 Date:14/05/2019
Subject Name:Principles of Process Engineering-III
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.
MARKS
Q.1 (a) Explain Raoult?s law with suitable assumptions. 03
(b) What is humidification ?Write the application of claypeyron equation
Equationequation
04
(c) Explain differential distillation and derive Rayleigh equation differential
distillation
07
Q.2 (a) Define: 1). Dry bulb temperature 2) Free moisture 3)Critical moisture 03
(b) Compare Azeotropic and Extractive distillation 04
(c) What is Azeotropes? Explain positive and negative deviation from
ideality with examples.
07
OR
(c) Explain step wise procedure of Mac-cabe Thiele method for obtaining
numbers of theoretical trays with suitable assumptions.
07
Q.3 (a) Difine: 1) Molal absolute humidity 2) Relative humidity 3) Humid
volume
03
(b) Explain types of adsorptions in brief. 04
(c) A feed solution contains 100 moles of Benzene- Toluene mixture having
70 mol % benzene. One third of feed is vaporized. The total pressure is 1
atmosphere. Calculate the distillate and bottom composition by using
flash distillation. Average relative volatility of solution mixture is 2.5.
07
OR
Q.3 (a) Discuss the effect of impurities in crystallization. 03
(b) Explain construction and working of Tray drier. 04
(c) Explain Mier?s theory of super saturation with neat sketch. 07
Q.4 (a) Write the detailed classification of cooling towers. 03
(b) Explain flash distillation with neat sketch. 04
(c) Explain selection criteria of adsorbent in detail. 07
OR
Q.4 (a) Write note on adsorption from concentrated liquid solution. 03
(b) Explain effect of temperature and pressure on adsorption. 04
(c) A mixture of benzene and toluene containing 45 mole % benzene is to be
separated to give an overhead product of 95 mole % benzene and a
bottom product containing 5 mole % benzene. The feed is at its boiling
point, and the vapor leaving the column is condensed but not cooled and
provides reflux and product. Equilibrium data for mol fractions of
benzene in liquid, x and vapor, y is given as follows:
x 0.78 0.581 0.411 0.258 0.130 0.017
y 0.90 0.777 0.632 0.486 0.261 0.039
07
Q.5 (a) Derive equation for constant rate drying period. 03
(b) Discuss agitated batch crystallizer with a neat diagram. 04
(c)
What is reflux ratio? Explain Total, Minimum and Optimum reflux ratio.
07
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI(NEW) ? EXAMINATION ? SUMMER 2019
Subject Code:2160405 Date:14/05/2019
Subject Name:Principles of Process Engineering-III
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.
MARKS
Q.1 (a) Explain Raoult?s law with suitable assumptions. 03
(b) What is humidification ?Write the application of claypeyron equation
Equationequation
04
(c) Explain differential distillation and derive Rayleigh equation differential
distillation
07
Q.2 (a) Define: 1). Dry bulb temperature 2) Free moisture 3)Critical moisture 03
(b) Compare Azeotropic and Extractive distillation 04
(c) What is Azeotropes? Explain positive and negative deviation from
ideality with examples.
07
OR
(c) Explain step wise procedure of Mac-cabe Thiele method for obtaining
numbers of theoretical trays with suitable assumptions.
07
Q.3 (a) Difine: 1) Molal absolute humidity 2) Relative humidity 3) Humid
volume
03
(b) Explain types of adsorptions in brief. 04
(c) A feed solution contains 100 moles of Benzene- Toluene mixture having
70 mol % benzene. One third of feed is vaporized. The total pressure is 1
atmosphere. Calculate the distillate and bottom composition by using
flash distillation. Average relative volatility of solution mixture is 2.5.
07
OR
Q.3 (a) Discuss the effect of impurities in crystallization. 03
(b) Explain construction and working of Tray drier. 04
(c) Explain Mier?s theory of super saturation with neat sketch. 07
Q.4 (a) Write the detailed classification of cooling towers. 03
(b) Explain flash distillation with neat sketch. 04
(c) Explain selection criteria of adsorbent in detail. 07
OR
Q.4 (a) Write note on adsorption from concentrated liquid solution. 03
(b) Explain effect of temperature and pressure on adsorption. 04
(c) A mixture of benzene and toluene containing 45 mole % benzene is to be
separated to give an overhead product of 95 mole % benzene and a
bottom product containing 5 mole % benzene. The feed is at its boiling
point, and the vapor leaving the column is condensed but not cooled and
provides reflux and product. Equilibrium data for mol fractions of
benzene in liquid, x and vapor, y is given as follows:
x 0.78 0.581 0.411 0.258 0.130 0.017
y 0.90 0.777 0.632 0.486 0.261 0.039
07
Q.5 (a) Derive equation for constant rate drying period. 03
(b) Discuss agitated batch crystallizer with a neat diagram. 04
(c)
What is reflux ratio? Explain Total, Minimum and Optimum reflux ratio.
07
2
OR
Q.5 (a) Derive equation for falling rate period. 03
(b) A filter cake is dried for 5 hours from an initial moisture content of 30%
to 10% (wet basis). Calculate the time required to dry the filter cake from
30% to 6% (wet basis). Equilibrium moisture content is 4% on dry basis
and Critical moisture content is 14% on dry basis.
04
(c) Explain with a neat diagram, principle and working of Rotary Dryer. 07
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This post was last modified on 20 February 2020