Q.1
14 Marks(a)
Explain film theory for mass transfer coefficient.
(b)
Differentiate between packed towers and tray tower.
(c)
Derive Fick’s law of diffusion and explain NAand JA. Also prove that For unidirectional binary diffusion JA=-JB.
Gujarat Technological UniversityWinter 2023 examination
GTU 3150501 Mass Transfer Operations I Winter 2023 Question Paper & PDF
B.E. · Chemical Engineering · Semester 5 · Subject code 3150501
- Total
- 70 marks
- To pass
- 23 marks (33%)
- Duration
- 2.5 Hours 10:30 AM – 1:00 PM
- Questions
- 5 with internal choice
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Q.2
14 Marks(a)
Define:
i)Flooding
ii)Priming
iii)Coning
(b)
Explain material balance for single stage extraction.
(c)
Discuss in detail classification of mass transfer operations and explain with examples.
OR
(c)
Derive equations to calculate rate of steady state diffusion of ‘A’ through non-diffusing ‘B’ and also for steady state equimolal counter diffusion in case of gases.
Q.3
14 Marks(a)
Explain Meir’s theory for crystallization.
(b)
Define
i)Weeping
ii)Dumping
iii)Tray Spacing
iv)Theoretical
Tray
(c)
Ammonia and air are in equimolal counter diffusion of each other in a cylindrical tube of 3 mm diameter and 20 m length. The total pressure is 1 atm and the temperature is 25°C. One end of the tube is connected to a large reservoir of NH3 and the other end of the tube is open to atmosphere. Estimate the mass transfer rates in kg/sec of ammonia and air. The mass diffusivity of mixture is 0.28 x 10⁻⁴ m²/sec
OR
(a)
Explain random packings and regular packing.
(b)
Explain selection criteria of solvent for gas absorption.
(c)
Explain equilateral–triangular co-ordinate, plaint point, tie line, one pair partially soluble system with examples and the mixture rule.
Q.4
14 Marks(a)
Discuss construction and working of Sparged Vessel.
(b)
Discuss local and overall mass transfer coefficients.
(c)
Explain selection criteria of solvent for extraction.
OR
(a)
What is Extraction? Give the industrial applications of Extraction.
(b)
Explain mass, heat and momentum transfer analogies.
(c)
Enlist different leaching equipment and explain any one in detail with neat
Q.5
14 Marks(a)
Explain preparation of solids for leaching.
(b)
Explain material balance for single stage leaching.
(c)
A gas mixture containing 3% by volume pentane vapour and 97 % inerts. The mixture is treated with a non-volatile absorption oil in an absorber and 97 % removal is required. The feed solvent is free from solute. The feed gas rate is 50 kmol/hr. equilibrium relation is Y=0.25X/(1+0.75X). where Y and X are mole ratio. Calculate minimum solvent required.
OR
(a)
Explain diffusion in solids.
(b)
Explain construction and working agitated tank crystallizer with the help of a neat sketch.
(c)
5000 kg/hr of a SO2-air mixture containing 5% by volume of SO2 is to be scrubbed with 2,00,000 kg/hr of water in a packed tower. The exit concentration of SO2 is reduced to 0.15%. The tower operates at 1 atm. The equilibrium relation is given by: Y = 30 X. Y = Mole SO2 / Mole air; X = Mole SO2 / Mole water If the packed height of tower (Z) is 0.42 m, Calculate the height of transfer unit (HTU).
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About this paper
Official Gujarat Technological University (GTU) examination paper for Mass Transfer Operations I (Winter 2023, B.E. · Chemical Engineering, Sem 5). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.
Transcribed for student exam preparation from Gujarat Technological University official examination archives. Questions, syllabus guidelines, and curriculum marking schemes remain the intellectual property of Gujarat Technological University.