Top 550+ Solved Mass Transfer MCQ Questions Answer
Q. Unsaturated air (with dry and wet bulb temperatures being 35 and 25°C respectively) is passed through water spray chamber maintained at 35°C. The air will be
a. Cooled
b. Humidified
c. Both (A) & (B)
d. Dehumidified
Q. __________ equation applies to diffusivities in liquids.
a. Gilliland
b. Hirschfelder
c. Wilke and Chang
d. None of these
Q. Mass transfer co-efficient is defined as
a. Flux = Co-efficient/concentration difference
b. Co-efficient = Flux/concentration difference
c. Flux=concentration difference/coefficient
d. None of these
Q. The relative volatility of a binary mixture at constant temperature __________ the total pressure.
a. Decreases with increase in
b. Increases with increase in
c. Is independent of
d. None of these
Q. Large quantity of silica gel is normally dried in a __________ dryer.
a. Freeze
b. Through circulation
c. Rotary vacuum
d. Tray
Q. The value of „L/mG’ ratio for economical absorption operation ranges from
a. 0.5 to 0.8
b. 0.8 to 1.2
c. 1.25 to 2.0
d. 2.5 to 3.5
Q. Cox chart, which is useful in the design of distillation column particularly for petroleumhydrocarbons, is a plot of (where, P = vapor pressure, T = temperature).
a. log P vs. T
b. log P vs. log T
c. T vs. P
d. P vs. log T
Q. Free flowing granular materials can be best dried in a __________ drier.
a. Rotary
b. Cylinder
c. Drum
d. Freeze
Q. In a packed bed absorption column, the channelling will be noted by the
a. Increase in flow rate
b. Sharp drop in pressure drop
c. Sharp rise in pressure drop
d. None of these
Q. The ratio of Murphree plate efficiency to point efficiency is always > 1 in a __________ flow model.
a. Plug
b. Perfectly mixed
c. Both (A) & (B)
d. Neither (A) nor (B)
Q. Fractional solvent extraction
a. Employs only one solvent
b. Employs two solvents
c. Results in low interfacial tension
d. None of these
Q. At the same gas flow rate, the pressure drop in a packed tower being irrigated with liquid__________ that in dry packed tower.
a. Is greater than
b. Is lower than
c. Is same as
d. Cannot be predicted as data are insufficient
Q. During dehumidification of unsaturated air wet bulb temperature & partial pressure of vapor are not constant. However, during evaporative cooling process with recirculated water supply, the __________ remains constant.
a. Wet bulb temperature
b. Partial pressure of water vapor
c. Relative humidity
d. None of these
Q. Wet bulb and dry bulb temperatures becomes identical at __________ percent saturationcurve.
a. 100
b. 50
c. 78
d. None of these