Mass Transfer Quiz 11
1 / 50
The reciprocal of stripping factor is termed as __________?
2 / 50
The rate of solid-liquid extraction is limited by the__________?
3 / 50
The individual mass transfer co-efficients (moles/m2s) for absorption of a solute from a gas mixture into a liquid solvent are, KL = 4.5 and KG = 1.5. The slope of the equilibrium line is 3. Which of the following resistance (s) is (are) controlling ?
4 / 50
5 / 50
The feed to fractionating column is changed from saturated vapour to saturated liquid. If the separation and reflux ratio remains unchanged, the number of ideal stages will________?
6 / 50
The mass transfer co-efficient for a solid sphere of radius ?a? dissolving in a large volume of quiescent liquid, in which ?D? is the diffusivity of solute, is _______?
7 / 50
The following plot gives the saturated humidity (He) versus temperature (T).Line joining (H1, T1) and (H2, T2) is the constant enthalpy line. Choose the correct one from among the alternatives A, B, C and D______?
8 / 50
The ratio of Murphree plate efficiency to point efficiency is 1 in a ________ flow model?
9 / 50
The interfacial area per unit volume of dispersion, in a gas-liquid contactor, for fractional hold up of gas = 0.1 and gas bubble diameter = 0.5 mm is given by (in m2/m3) ?
10 / 50
The minimum liquid rate to be used in an absorber corresponds to an operating line_________?
11 / 50
The most economical range of absorption factor is______?
12 / 50
The most common packing used in industrial operations is ________ rings?
13 / 50
The rough value of diffusion co-efficient of water vapor into air at 25?C may be about _______ cm2/sec?
14 / 50
The interfacial area per unit volume of dispersion, in a gas-liquid contactor, for fractional hold up of gas = 0.1 and gas bubble diameter = 0.5 mm is given by (in m2/m3)__________?
15 / 50
The operation involved when the soluble material is largely on the surface of an insoluble solid and is merely washed off by the solvent is called___________?
16 / 50
The ratio of Murphree plate efficiency to point efficiency is always > 1 in a ________ flow model?
17 / 50
The slope of the operating line for a single component co-current absorber when plotted in terms of mole ratio units is_______?
18 / 50
The falling rate period in the drying of a solid is characterised by___________?
19 / 50
The overall mass transfer co-efficient for the absorption of SO2 in air with dilute NaOH solution can be increased substantially by_____?
20 / 50
The Knudsen diffusivity is proportional to (where, T = absolute temperature) ________?
21 / 50
The minimum number of theoretical plates is required for achieving a given separation in distillation column with__________?
22 / 50
The partial pressure distribution of an ideal gas diffusing through another stagnant ideal gas at steady state follows a/an __________ law?
23 / 50
The reason for preferring packed towers over plate towers in distillation practice is that the packed tower operation gives_____?
24 / 50
The solvent used in liquid extraction should not have high latent heat of vaporisation, because ________?
25 / 50
The Hatta number is important in__________?
26 / 50
The rate of mass transfer is not dependent upon the________?
27 / 50
The Hatta number is important in________?
28 / 50
The recovery of penicillin from the acidified fermentation broth is done by___________?
29 / 50
The Schmidt number which is defined as, ?/? D, is the ratio of the_______?
30 / 50
The operating cost of a distillation column at minimum reflux ratio is______?
31 / 50
The operating line for an absorber is curved, when plotted in terms of _________?
32 / 50
The Knudsen diffusivity is dependent on the ________?
33 / 50
The percentage humidity is less than the relative humidity only at ___________ percent humidity?
34 / 50
The minimum liquid rate to be used in an absorber corresponds to an operating line___________?
35 / 50
The slope of 9-line is determined by the________?
36 / 50
The mass diffusivity, the thermal diffusivity and the eddy momentum diffusivity are same for, NPr = NSc = __________?
37 / 50
The process employing desorption of the absorbed solute by a solvent is called______?
38 / 50
The humid volume may be increased by increasing the______?
39 / 50
The relative saturation of an unsaturated mixture of gas and vapor is independent of the_____?
40 / 50
The relative saturation of a partially saturated mixture of vapour and gas can be increased by _________ of the mixture?
41 / 50
The slope of 9-line is determined by the___________?
42 / 50
The most efficient cooling tower out of the following is_______?
43 / 50
The relative volatility of a binary mixture at the Azeotropic composition is _________?
44 / 50
The main reason for dividing a tall packed tower into series of small towers is to__________?
45 / 50
The relative humidity of air decreases in-spite of an increase in the absolute humidity, when the______?
46 / 50
The slope of the operating line for a single component co-current absorber when plotted in terms of mole ratio units is___________?
47 / 50
The McCabe ?L law states that the______?
48 / 50
The reflux to a distillation column is 100 moles/hr, when the overhead product rate is 50 moles/hr. The reflux ratio is______?
49 / 50
The film penetration model of mass transfer was enunciated by________?
50 / 50
The relation, Sc = Pr = 1, is valid, when the mechanism of _______ transfer is same?
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