Mass Transfer

A. NSc = 1
B. NSc = NPr = NLe
C. NPr = NLe
D. NSc = NLe

A. Absorption factor is constant, when the equilibrium and operating lines are straight
B. In case of a stripper, the equilibrium curve is always below the operating line
C. In case of an absorber, the operating line is always above the equilibrium curve
D. In the absorption of low solubility gases, the liquid film is the controlling resistance

A. In the corners
B. Inside
C. On the sides
D. None of these

A. Sparingly soluble
B. Highly soluble
C. A pure substance
D. A mixture

A. As the acetone concentration increases, the solubility curves approach each other
B. Both the phases become identical at a particular common point on both the solubility curves
called the plait point
C. The distribution curve which is a plot between x (acetone concentration in one phase) and y
(acetone concentration in other phase) is analogous to x-y curve used in distillation and
absorption terminates on the x = y diagonal at the concentration of the plait point
D. All A., B. and C.

A. < 150
B. 200-330
C. > 500
D. > 1000

A. Higher molecular weight is adsorbed in preference to a gas of low molecular weight
B. High critical temperature is adsorbed in preference to a gas of low critical temperature
C. Low volatility is adsorbed in preference to a gas of high volatility
D. None of these

A. Humidification only
B. Heating only
C. Both heating and humidification
D. Evaporative cooling

A. Flow rate of the entering gas
B. Composition of the entering liquid
C. Terminal concentrations of gas stream
D. None of these

A. Of the assumption that vapour and liquid leaving the reboiler are in equilibrium
B. Vapour is recycled to the column
C. Reboiler itself contains one plate
D. None of these