Mass Transfer Set 19

Q1 | As complete saturation of an adsorbent is approached, the differential heat of adsrop-tion approaches

Q2 | During bottling of cold drinks (e.g. Pepsi), the main resistance to mass transfer for the absorption of carbon dioxide in water lies in the

Q3 | Relative humidity is the ratio of the

Q4 | In the absorption of ammonia in water, the main resistance to absorption is by the__________ phase.

Q5 | In paper industry, paper is dried in a __________ dryer.

Q6 | Tray spacing in a distillation column of dia 10-12 ft. used in petroleum refinery may be around __________ inches.

Q7 | Which of the following plays an important role in problems of simultaneous heat and mass transfer?

Q8 | In a moderately sized packed absorption tower, channelling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter

Q9 | If f = moles of vapour present per mole of feed, then the slope of feed line is (McCabeThiele method)

Q10 | Pick out the wrong statement.

Q11 | Mass transfer co-efficient of liquid is

Q12 | Heat sensitive materials with very high latent heat of vaporisation may be economically separated using

Q13 | The reciprocal of stripping factor is termed as

Q14 | A distillation column with N plates is being operated under normal conditions. At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped). At the new steady state,

Q15 | In distillation columns, the number of bubble caps per tray primarily depends upon the

Q16 | Batch tray dryers suffers from the disadvantage of

Q17 | For absorbing a sparingly soluble gas in a liquid

Q18 | Smoke is an example of

Q19 | Low viscosity absorbent is preferred for reasons of

Q20 | Pick out the wrong statement.

Q21 | The wetted wall tower is used to determine

Q22 | Rotary dryers cannot handle __________ materials.

Q23 | In a solution containing 0.30 Kg mole of solute and 600 kg of solvent, the molality is

Q24 | Small dia distillation column can be a

Q25 | Prandtl number for water at 20°C is about