Mass Transfer Quiz 7
1 / 50
Moisture in a solid exerting an equilibrium vapour pressure equal to that of the pure liquid at the same temperature is called the _____ moisture ?
2 / 50
Mass transfer co-efficient ?K? according to penetration theory varies with mass diffusivity as______?
3 / 50
Minimum possible diameter of a packed column is decided mainly by the__________?
4 / 50
Most important factor to be considered in the selection of packings for absorbers is the _______ of packing?
5 / 50
Mass transfer co-efficient (K) and diffusivity D. are related according to film theory as________?
6 / 50
Molarity is defined as the number of gm moles of solute per _________ of solvent?
7 / 50
NSc/NPr is called the________?
8 / 50
Lewis number, which is important in problems involving simultaneous heat and mass transfer, is the ratio of___________?
9 / 50
McCabe-Thiele method_________?
10 / 50
On moving the feed line (q-line) from saturated liquid feed (vertical position) to saturated vapor feed (horizontal feed), if the slope of both the operating lines are to be increased, then it will result in________?
11 / 50
Low viscosity absorbent is preferred for reasons of ______?
12 / 50
Molecular diffusion is caused by the_________?
13 / 50
Mass transfer co-efficient is directly proportional to DAB according to the ______ theory?
14 / 50
Make up water is supplied during cooling tower operation to compensate for water losses due to________?
15 / 50
On addition of solute in the solvent, the _______ of the solution decreases ?
16 / 50
Molecular sieves are regenerated by heating to _______ ?C?
17 / 50
Measurement of the interfacial area of mass transfer is achieved easily & accurately in case of a _________ column?
18 / 50
Molecular diffusivity of a liquid___________?
19 / 50
McCabe-Thiele method of binary distillation does not assume that the___________?
20 / 50
One mole feed of a binary mixture of a given composition is flash vaporised at a fixed P and T. If Raoult?s law is obeyed, then changing the feed composition would effect ?
21 / 50
Make up water is required in a cooling tower to replace the water lost by_____?
22 / 50
Only small amount of evaporation of water produces large cooling effects because of its_____?
23 / 50
Liquid diffusivity is of the order of ________ cm2 /second?
24 / 50
Leaching rate is independent of the_________?
25 / 50
Nitrobenzene (boiling point = 210.6?C) is steam distilled at 1 atm pressure. Nitrobenzene will distil off ________ ?C?
26 / 50
Minimum reflux ratio in a distillation column results in_______?
27 / 50
Leaching of coffee from coffee beans is done by_____?
28 / 50
Leaching of uranium ore and gold ore is done in__________?
29 / 50
Molality is defined as the number of gm moles of solute per __________ of solvent ?
30 / 50
Lewis number (Le) is______?
31 / 50
Mechanism of moisture removal in case of freeze drying of food stuff is by _____?
32 / 50
Lewis number (Le) is_____?
33 / 50
Molecular distillation is_______?
34 / 50
Mass transfer co-efficient varies as DAB 0.5, according to the ________ theory?
35 / 50
36 / 50
Mass transfer rate between two fluid phases does not necessarily depend on the _______ of the two phases?
37 / 50
Occurrence of ?case hardening? during drying of a high moisture solid cake ________ the drying rate?
38 / 50
Moisture contained by a substance in excess of the equilibrium moisture is called the ________ moisture?
39 / 50
Mass transfer co-efficient is directly proportional to DAB 0.5, according to _________ theory ?
40 / 50
Molecular sieves are porous______?
41 / 50
Leaching of sugar from sugar beets is done by_____?
42 / 50
Mass transfer co-efficient of liquid is______?
43 / 50
Moisture content of a substance when at equilibrium with a given partial pressure of the vapour is called the ________ moisture?
44 / 50
Ordinary diffusion process is also called _______ diffusion?
45 / 50
Mass transfer co-efficient is directly proportional to DAB according to the __________ theory?
46 / 50
Minimum reflux ratio in a distillation column results in___________?
47 / 50
Operating velocity in a packed tower is usually ___________ the flooding velocity ?
48 / 50
Leaching of uranium ore and gold ore is done in_______?
49 / 50
Measurement of the interfacial area of mass transfer is achieved easily & accurately in case of a ________ column?
50 / 50
Milk is dried usually in a ___________ dryer?
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