condensed column product that is pumped back to the top tray of a (a) Residual (

Question

condensed column product that is pumped back to the top tray of a (a) Residual (b) Extract (c) Catalyst (d) Reflux Q30. All of the following are types of plates used in distillation columns except (a) Sieve (b) Concave (c) Bubble Cap (d) Valve Q31. Two major distillation columns designs are (a) Packed, Plate (b) Fluidized, Nonfluidized (c) Foaming, Nonfoaming (d) Raffinate, Extract Q32. For a given liquid in a system, when the pressure is lowered, the boiling point (a) Increase (b) Does not change (c) Increase initially but decrease afterwards (d) Decrease Q33. The role of the reboiler in distillation processes is (a) To cool the bottom section of the column (b) To help provide and maintain heat to the column (c) To generate steam (d) a and c Q34. All of the following are separation processes except (a) Distillation (b) Absoption (c) Extraction (d) Extruding

Explanation / Answer

Question 29)

Here the condensed vapors from the top of the distillation column are pumped back to the column , this implies they are basically refluxed back to the column

Hence the answer is option d) reflux

Question 30)

Sieve tray are the tray which have simple holes/ orifice made on the plate

In bubble cap trays we have bubble cap on these trays where the vapors are forced to passed through these bubble caps which passing through liquid phase for effective mass transfer to take place

Valve trays are similar to bubble cap trays

There are no trays as concave trays

Hence the answer is option b) Concave

Question 31)

The two famous forms which we carry out distillation process is in Plate columns where in we have plates are kept at certain constant distance. Here the mass transfer takes place on the tray

The other column is a packed column. Where liquid in these packing gets split into droplets and comes in contact with vapor. So this way here mass transfer takes place between liquid and vapors

Hence the correct answer is option a) Packed, plate

Question 32)

Now the when the pressure is lowered the vapor pressure of the components will also decrease and a result of these the mixture will now boil at a lower temperature. Hence the temperature will decrease

Answer is option d) Decrease

Question 33)

Role of reboiler is to provide the heat to provide the heat for the system so the the desired product can be obtained of desired quality

Hence the correct answer is option b) To help provide and maintain heat to the column.

Question 34)

Distillation, absorption and extraction all of these process involve direct separation (for distillation operation) and indirect separation ( in case of absorption and extraction ) whereas extruding a process carried out during polymerization for providing certain characteristics to the polymers

Hence the correct answer is option d) Extruding

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