Q.1
14 Marks(a)
Define: Plait point, selectivity and distribution coefficient in liquidliquid extraction
(b)
Discuss the factors affecting choice of separation method
(c)
Discuss in detail about Steady State Cocurrent processes
Gujarat Technological UniversityWinter 2025 examination
GTU 3150501 Mass Transfer Operations I Winter 2025 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)
Explain mass transfer operation between two immiscible phases
(b)
Deduce an equation for molar flux for diffusion of component A through non-diffusing component B in case of steady state molecular diffusion for liquid phase
(c)
With neat sketch, explain spray tower and sparged vessel as G-L equipment in brief.
OR
(c)
Explain the following terms with respect to tray towers:
i)Flooding
ii)Priming
iii)Coning
iv)Weeping
v)Dumping
vi)Tray Spacing
vii)Theoretical Tray
Q.3
14 Marks(a)
Compare N type flux and J type flux.
(b)
Compare Penetration theory with surface renewal theory with reference to molecular diffusion
(c)
Methane diffuses at steady state through a tube containing helium for the case equimolar counter diffusion. At point 1, the partial pressure of methane is 55 kPa and at point 2, 0.03 m apart is 15 kPa. The total pressure is 101.325 kPa and temperature is 298 k, at this temperature and pressure the value of diffusivity is 6.75 × 10⁻⁵ m² /s. Calculate the partial pressure of methane at point 0.02 m apart from point 1 for the above case
OR
(a)
Explain mass, heat and momentum transfer analogies.
(b)
Classify gas-liquid mass transfer operations with principle.
(c)
Oxygen (A) is diffusing through carbon monoxide (B) under steady state condition with carbon monoxide non-diffusing. The total pressure is 1×10⁵ N/m² and temperature is 0°C. The partial pressure of oxygen at two planes 2.0 mm apart is respectively 13000 and 6500 N/m². The diffusivity for the mixture is 1.87×10⁻⁵ m² /s. Calculate the rate of diffusion of oxygen in kmol/s through each square meter of the two planes
Q.4
14 Marks(a)
Define the following terms with respect to tray tower a) Priming b) Coning c) Weeping
(b)
Explain the characteristics of fill for packed tower
(c)
Explain “two resistance theory” briefly
OR
(a)
Define the following terms with respect to tray tower a) Flooding b) Dumping c) Tray Spacing
(b)
Explain mass, heat and momentum transfer analogies
(c)
Explain the prevention of vortex formation in mechanically agitated vessel.
Q.5
14 Marks(a)
Define: a) Absorption factor b) Crystallization c) selectivity of solvent
(b)
Explain Meir’s super saturation theory of crystallization.
(c)
Explain Ternary liquid- liquid equilibrium and tie line
OR
(a)
Define: a) Recoverability of solvent b) absorption c) striping
(b)
Define super saturation and explain Meir’s super saturation theory. Explain stages of crystallization. Explain stages or mechanism of crystallization.
(c)
Discuss the system of three liquids- one pair partially soluble and the effect of temperature on ternary equilibria.
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About this paper
Official Gujarat Technological University (GTU) examination paper for Mass Transfer Operations I (Winter 2025, 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.