Al$.$ Balega Applied University

Faculty of Enginecring Technolegy

Chemical Iingineering Department

$(3)$

A new phase is created from the original solution in:

A$)$ Absorption

B$)$ Extraction

C$)$ Distillation

D$)$ Leaching

$2-$ The phase that is rich in the solvent in liquid$-$liquid extraction is called:

A$)$ Raftinate

B$)$ Extract

C$)$ Residual

D$)$ Solvent

$3-$ The term for the separation of oil from oil seeds using hexane is:

A$)$ Leaching

B$)$ Adsorption

C$)$ Extraction

D$)$ Crystallization

$4-$ The movement of molecules in molecular diffusion can be described as:

A$)$ Zigzag

B$)$ Circular

C$)$ Straight

D$)$ Wavy

$5-$What is the driving force for diffusion to occur in liquids?

A$)$ Pressure gradient

B$)$ Viscosity gradient

C$)$ Concentration gradient

D$)$ Density gradient

$6-$How can diffusivity of component $A$ in liquid $B$ be enhanced?

A$)$ Increasing molecular weight of $A$

B$)$ Increasing temperature

C$)$ Increasing viscosity of $B$

D$)$ Increasing molar volume of $A$

$7-$The main advantage of the counter$-$current process over the co$-$current is:

A$)$ Larger equipment size

B$)$ Easier operation

C$)$ Less maintenance

D$)$ Higher efficiency