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This quiz contains multiple-choice problems on interphase mass transfer, various material balance concepts and cascade stages.
The concentration of the two phases in a closed system at the interphase
Changes continuously
Never changes
Becomes zero
Increases till the driving force becomes zero
The diffusion of components between the phases at equilibrium
Is zero
Is infinity
Changes continuously
Never occurs
Consider a steady-state condition; the concentration at any point in the equipment never changes with time. True or false?
True
False
Which one of the following has the highest emissivity?
Aluminium foil
Polished aluminum
Tarnished copper
Polished copper
The real driving force of the mass transfer is
Pressure gradient
Physical potential
Chemical potential
Concentration gradient
The interphase concentrations of the component in both phases having equal chemical potential is due to differential concentration. True or false?
True
False
The equilibrium concentrations in the gas and the liquid phases, in mole fraction, give rise to a curve known as
Equilibrium distribution curve
Equilibrium concentration curve
Differential distribution curve
Differential concentration curve
What is the emissivity value for polished aluminium?
0.01
0.02
0.03
0.04
What is the emissivity value for polished copper?
0.02
0.03
0.04
0.05
What is the emissivity value for tarnished copper?
0.78
0.77
0.76
0.75
Which one of the following has the lowest emissivity?
Polished stainless steel
White marble
Snow
Asphalt
What is the emissivity value for dull stainless steel?
0.24
0.23
0.22
0.21
What is the emissivity value for white marble?
0.96
0.95
0.94
0.93
What is the emissivity value for asphalt?
0.90
0.80
0.70
0.60
Among the following, which one has highest emissivity?
Red brick
Concrete
Black paint
Dull stainless steel
