Quiz Concept Day 2

Question 1

Rose oil is extracted from rose leaves using distillation

Answer 1

Steam Distillation

Question 2

When the solvent dissolves very little of solute then

Answer 2

large quantity of solvent is required to extract the solute

Question 3

An ideal single stage extraction process is used to treat 100 mol/s of an organic feed solution. The solute concentration in this solution is to be reduced from 0.5 mol% to 0.1 mol%. A pure solvent S is used. To reduce the solvent requirement by half for the same separation

Answer 3

use another pure solvent S* whose partition coefficient is twice that of S

Question 4

Flash distillation is suitable for the separation of components

Answer 4

having very wide boiling points.

Question 5

Relative volatility varies with the concentration of component for an ideal solution. The relative volatity of a binary mixture may be defined as the ratio of vapor pressure of component ‘A’ to that of component ‘B’, when

Answer 5

vapor phase obeys Dalton’s law and liquid phase obeys Raoult’s law.

Question 6

Leaching of coarse solid lumps is also termed as

Answer 6

percolation

Question 7

Large scale usage of flash distillation is practiced in

Answer 7

petroleum refinning

Question 8

Which of the following is the most suitable for extraction in a system having very low density difference ?

Answer 8

Centrifugal extractor

Question 9

In batch distillation with constant reflux, overhead product composition with time.

Answer 9

decreases

Question 10

Raoult’s law applies to the

Answer 10

solvents.

Question 11

In distillation, overhead product contains

Answer 11

any number of components

Question 12

For the same feed, feed quality and separation (in a distillation column), with the increase of total pressure, the number of ideal plates will

Answer 12

increase

Question 13

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

Answer 13

elutriation or elution

Question 14

An aqueous solution of methanol is to be distilled in a tray column. High pressure steam is available as a source of heat. For a given reflux ratio and overhead composition, two options are being explored; (i) a reboiler is used and (ii) no reboiler is used but steam is fed directly to the bottom of the column. As compared to option (i), in option (ii)

Answer 14

less number of trays are required.

Question 15

Ponchan-Savarit method analyses the fractional equipment based on

Answer 15

both enthalpy and material balances.

Question 16

The fixed cost of a distillation column at minimum reflux ratio is

Answer 16

infinite

Question 17

extractor uses centrifugal force for separating the two phases.

Answer 17

Podbielniak

Question 18

Pick out the wrong statement.

Answer 18

The capacity of a distillation column is maximum at total reflux.

Question 19

Which of the following is not a continuous leaching equipment?

Answer 19

Pachuka tank

Question 20

For a binary mixture with low relative volatility, continuous rectification to get pure products will require

Answer 20

high reflux ratio

Question 21

In steam distillation, the

Answer 21

product must be immiscible with water.

Question 22

How many intensive variables must be specified to fully describe a system containing mixture of water, liquid benzene and nitrogen.

Answer 22

2

Question 23

Actual work delivered divided by the corresponding ideal work is known as efficiency.

Answer 23

turbine

Question 24

Heat capacity is defined as C = dQ/dT, what is the difficulty about the relationship of C to Q which are supposedly state functions?

Answer 24

It is a process-dependent quantity

Question 25

Which of the following gives the most work we can get out of an adiabatic system?

Answer 25

Reversible expansion