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Home⇒ Engineering⇒
Mass transfer
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q41 ⇒ Pick out the wrong statement. Mechanical agitation is required, if the system has low interfacial tension. [other wrong options] [Discuss in forum] Seive tray towers are generally used for systems having low interfacial tension. When Henry's law constant is very small, then the mass transfer rate is controlled by the gas film resistance. Taylor-Prandtl analogy for heat and mass transfer considers the transfer through both laminar and turbulent layers. |
Q42 ⇒ Which is not concerned directly with mass transfer ? Froude number [other wrong options] [Discuss in forum] Schmidt number Sherwood number Lewis relationship |
Q43 ⇒ Diffusivity in concentrated solutions differs from that in dilute solutions, because of the changes in both (a) and (b). [other wrong options] [Discuss in forum] viscosity with concentration. degree of ideality of the solution. neither (a) nor (b). |
Q44 ⇒ The wet and 'dry bulb temperature for a vapour-gas mixture are 25°C and 30°C respectively. If the mixture is heated to 45°C at constant pressure, the wet bulb temperature will be __________ °C. > 25 [other wrong options] [Discuss in forum] 25 < 25 -25 |
Q45 ⇒ In a counter-current extractor, as the axial mixing increases, the extraction efficiency decreases [other wrong options] [Discuss in forum] increases remains unchanged depends on the pressure of the system |
Q46 ⇒ H2S is being absorbed in a gas absorber unit. The height of the transfer unit based on the overall mass transfer coefficient on the gas side is 0.4 m. The equilibrium data is given by, y = 1.5 x. The bulk concentration of H2S has to be reduced from 0.05 to 0.001 mole fraction in the gas side. The height of the tower (in metres) corresponding to an operating line given by, y = 5x + 0.001 is 2 [other wrong options] [Discuss in forum] 1.56 1 0.56 |
Q47 ⇒ Which of the following is the most commonly used leaching solvent in vegetable oil industry ? Hexane [other wrong options] [Discuss in forum] Phenol Furfurol Liquid SO2 |
Q48 ⇒ Which one of the following devices is not used for both the absorption as well as the liquid-liquid extraction processes ? Wetted wall columns [other wrong options] [Discuss in forum] Packed towers Plate towers Spray towers |
Q49 ⇒ Which of the following equipments is not used for gas dispersion ? Spray towers [other wrong options] [Discuss in forum] Agitated vessels Bubble cap tray towers Perforated sieve tray towers |
Q50 ⇒ Steady state temperature reached by a small amount of liquid evaporating into a large amount of unsaturated vapour-gas mixture is called the __________ temperature. wet-bulb [other wrong options] [Discuss in forum] dry-bulb dew point adiabatic saturation |
Q51 ⇒ Diffusion in concentrated solutins differs from that in dilute solutions, because of the change in the __________ with the concentration of the solution. both 'a '& 'b' [other wrong options] [Discuss in forum] degree of ideality viscosity neither 'a' nor 'b' |
Q52 ⇒ Extraction of coffee from its seed is done by leaching. [other wrong options] [Discuss in forum] liquid-liquid extraction. extractive distillation. steam distillation. |
Q53 ⇒ When both the fluids flow concurrently in an absorber, the slope of the operating line is - ve [other wrong options] [Discuss in forum] + ve 1 -1 |
Q54 ⇒ The rough value of diffusion co-efficient of water vapor into air at 25°C may be about __________ cm2/sec. 0.25 [other wrong options] [Discuss in forum] 2.5 1.25 0.0025 |
Q55 ⇒ The falling rate period in the drying of a solid is characterised by increasing temperatures both on the surface and within the solid. [other wrong options] [Discuss in forum] increase in rate of drying. decreasing temperatures. none of these. |
Q56 ⇒ Unit operation involved in the prilling of urea is both (b) and (c) [other wrong options] [Discuss in forum] evaporation drying crystallisation |
Q57 ⇒ __________ number indicates the ratio of the rates of the heat and mass transfer incase of a cooling tower. Lewis [other wrong options] [Discuss in forum] Sherwood Stanton Peclet |
Q58 ⇒ The suitable evaporator for concentration of foaming liquids is a __________ evaporator. long tube [other wrong options] [Discuss in forum] short tube vacuum falling film |
Q59 ⇒ Pick out the correct statement. all (a), (b) and (c). [other wrong options] [Discuss in forum] For identical gas flow rates, less pressure drop occurs through a plate tower than through a packed tower. Plate column can handle greater liquid loads without flooding than packed column, but the liquid hold up is more in the case of plate column. For the same duty, plate columns weigh less than packed columns. |
Q60 ⇒ 'ADDUCTS' and 'CLATHRATES' are used in case of crystallisation. [other wrong options] [Discuss in forum] extractive distillation. absorption. none of these. |
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