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This quiz contains multiple-choice problems on liquid extraction equilibria, unit operation solvent selection, extraction equipment and ternary equilibrium diagram.
The moisture in the solid after attaining equilibrium is known as
For extraction, the distribution coefficient should be greater than 1. True or false?
True
False
The viscosity of the solvents used in the extraction operation should be high. True or false?
True
False
Find the separation factor if the ratio of weight fraction of solute in the extract to raffinate is 0.75, and the ratio of dilutant in raffinate to extract is 0.5.
1
1.25
1.5
1.75
The azeotropic composition of the solute makes the extraction process economical. True or false?
True
False
Separation is possible if the ratio of weight fraction of solute in the extract to raffinate is 0.15, and the ratio of dilutant in raffinate to extract is 0.5. True or false?
True
False
In absorption operation, the solubility of gas should be high on the solvent. True or false?
True
False
Moisture removal from a material/compound is known as drying. True or false?
True
False
The solution can be dried by spraying droplets with cold gas. True or false?
True
False
Spraying the liquid over gas leads to
Humidification
Evaporation
Heating of gas
None of the above
The additional operation required for drying gas and liquid is
Absorption
Adsorption
Humidification
De-humidification
For rapid absorption rate, low pressure drop and greater heat transfer, we need
More viscous solvent
No viscous solvent
Low viscous solvent
None of the above
The moisture inside a substance is known as
Free moisture
Unbound moisture
Equilibrium moisture
Bound moisture
The solvent used in extraction should be more volatile. True or false?
True
False
The usage of solvent should be less in the extract. True or false?
True
False
