This set of Mass Transfer Multiple Choice Questions & Answers (MCQs) focuses on “Diffusion in a Binary Gas Mixture”. 1. Oxygen diffuses through a stagnant layer of air, 1mm thick, ambient temperature 28°C and 1atm total pressure. The partial pressure of oxygen on two sides of layer is P1=0.9atm and P2=0.1atm respectively. Calculate the value … Read more
This set of Mass Transfer Multiple Choice Questions & Answers (MCQs) focuses on “Diffusion through Variable Area”. 1. Consider steady-state equimolar counterdiffusion through the converging-diverging tube. Given: r1=1cm; r2=2cm; NA=10-6 kmol/m2.s at the vessel 1 end of the tube. The rate of transport of B at the vessel 2 end of the tube is a) … Read more
This set of Mass Transfer Multiple Choice Questions & Answers (MCQs) focuses on “Multicomponent Diffusion”. 1. A mixture undergoing multicomponent diffusion is analyzed through the Maxwell-Stefan approach. With regard to this approach which among the following statements are incorrect? The difference in the partial pressure of the Component A over a small distance ∆z (AB)is … Read more
This set of Mass Transfer Multiple Choice Questions & Answers (MCQs) focuses on “Molecular Diffusion in Gas”. 1. __________ energy helps for molecular diffusion. a) Thermal b) Electrical c) Internal d) All of the mentioned 2. For two particles at steady state collision of A and B, J flux of A is 2 mol/sq.m sec … Read more
This set of Mass Transfer Multiple Choice Questions & Answers (MCQs) focuses on “Molecular Diffusion in Liquids”. 1. Before collision, the distance between the two particles is mean free path. a) True b) False 2. Diffusion co-efficient in molecular diffusion is estimated by _________ a) Daltons law b) Diffusion law c) Ficks law d) None … Read more
This set of Mass Transfer Multiple Choice Questions & Answers (MCQs) focuses on “Molecular Diffusion in Solids “. 1. Find the operation where diffusion of solids not occurs a) Adsorption b) Leaching c) Drying d) Distillation 2. Find the diffusivity through slab if N flux of A 4 mol/sq.m sec, concentration difference is 2mol/cu.m and … Read more
This set of Mass Transfer Puzzles focuses on “Design of Extractor for Multistage Stage Operations”. 1. More than one tie line is represented in an equilibrium triangular system is known as a) Single stage extractor b) Multistage extractor c) Single stage cascades d) None of the mentioned 2. Find the number of stages. a) 1 … Read more
This set of tough Mass Transfer Questions focuses on “Correlations For Free Convection”. 1. In respect to free convection over a vertical flat plate, the Nusselt number for laminar and turbulent flows varies respectively with Grashoff number G r as a) G r and G r1/4 b) G r1/2 and G r1/3 c) G r1/4 … Read more
This set of Mass Transfer Multiple Choice Questions & Answers (MCQs) focuses on “Leaching Operation”. 1. Wood ash leaching for alkali is known as ________ a) Lixivation b) Lixartion c) Lixation d) None of the mentioned 2. The boiling point of the solvent is ______ a) Boiling solvent b) Decoction c) Leaching d) None of … Read more
This set of Mass Transfer Multiple Choice Questions & Answers (MCQs) focuses on “Drying Operation”. 1. Moisture removal from a material/ compound is known as drying. a) True b) False 2. Find the representation X. a) Water b) Water vapour c) Ice d) All of the mentioned 3. The solution can be dried by spraying … Read more
