Top 550+ Solved Mass Transfer MCQ Questions Answer
Q. For the same system, if the same liquid used in an absorber is decreased, the tower height will
a. Increase
b. Decrease
c. Remain unaffected
d. Decrease or increase; depends on the type of liquid
Q. In steam distillation, the
a. Temperature is 100°C
b. Temperature is more than 100° C
c. Product must be immiscible with water
d. Temperature is higher than the boiling point of either component
Q. The equation, NA = (DAB . Pt /RTZ . PBM) (PA1 - PA2) is for
a. Fick's second law of diffusion
b. Steady state diffusion for stagnant case
c. Liquid M.T.C. by Higbie penetration theory
d. None of these
Q. A slurry is to be dried to produce flaky solid. Which dryer would you recommend?
a. Spray dryer
b. Drum dryer
c. Rotary dryer
d. Dielectric dryer
Q. Perforated plate towers are unique for solvent extraction because, they provide
a. Higher contact area
b. Better contact of the phase
c. Repeated coalescence & redispersion of the drop phase
d. None of these
Q. Which of the following parameters remains constant during chemical dehumidification?
a. Dry bulb temperature
b. Partial pressure of vapour
c. Wet bulb temperature
d. None of these
Q. For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG: mass transfer co-efficient, moles/m2, a: interfacial area per unit volume of tower)
a. G/(FG . a)
b. FG/(G . a)
c. (G . a)/FG
d. L/(FG . G)
Q. Coffee is prepared from coffee beans by leaching with
a. Cold water
b. Hot water
c. Dilute hot caustic solution
d. Naphtha
Q. The equation, NA = (DAB . Pt /RTZ) (y1 - y2) is for
a. Steady state equimolar counter diffusion
b. Fick's first law of diffusion
c. Steady state diffusion for stagnant case
d. Liquid M.T.C. by penetration theory
Q. To remove all the moisture from a wet solid it requires exposure to __________ air.
a. Perfectly dry
b. Highly humid
c. High temperature
d. None of these
Q. The cooling effect in a cooling tower can be speeded up by
a. Increasing the air velocity and area of exposed wet surface
b. Reducing the barometric pressure
c. Reducing the humidity of the air
d. All (A), (B) and (C)
Q. Relative volatility does not change appreciably with the change in
a. Temperature
b. Vapour pressure of either component
c. Total pressure
d. None of these
Q. The difference of wet bulb temperature and adiabatic saturation temperature of unsaturated mixture of any system is
a. +ve
b. -ve
c. Zero
d. None of these
Q. A minimum boiling azeotrope is exemplified by
a. Toluene-benzene
b. Acetone-carbon disulphide
c. Water-isobutyl alcohol
d. None of these