Top 550+ Solved Mass Transfer MCQ Questions Answer
Q. The relation, Sc = Pr = 1, is valid, when the mechanism of __________ transfer is same.
a. Heat and mass
b. Mass and momentum
c. Heat and momentum
d. Heat, momentum and mass
Q. McCabe-Thiele method
a. Uses molal units for material and energy balance
b. Uses weight fractions to express liquid and vapour composition
c. Can use any type of units
d. Is more accurate than Ponchon-Savarit method
Q. If the path of liquid across the plate is very long as in case of large diameter tower, Murphree efficiency can be __________ percent.
a. 100
b. > 100
c. < 100
d. None of these
Q. Humid volume, at a given temperature is a/an __________ function of humidity.
a. Inverse
b. Exponential
c. Linear
d. Logarithmic
Q. Flooding in a vapor-liquid contacting equipment occurs in a tray, when the pressure drop through a tray is __________ the liquid head available in the downcomer.
a. Less than
b. More than
c. Same as
d. Very much less
Q. In case of __________ distillation, a solvent is added to alter the relative volatility of themixture to be separated.
a. Molecular
b. Azeotropic
c. Extractive
d. Flash
Q. Pick out the wrong statement.
a. Packed towers are preferred for vacuum operation, because the pressure drop through the packing is less and they (packings) also lessen the possibility of tower wall collapse
b. Packed towers are preferred over plate towers for handling corrosive and foamy liquids
c. Diameter of randomly packed tower is normally more than 1.2 metres
d. Due to uneven supply and improper distribution of liquid, problem of channelling, loading & flooding is generally encountered in packed towers
Q. Moisture contained by a substance in excess of the equilibrium moisture is called the __________ moisture.
a. Unbound
b. Free
c. Critical
d. Bound
Q. Which of the following is an undesirable characteristic for the solvent used in gas absorption?
a. Low vapor pressure
b. Low viscosity
c. High gas solubility
d. None of these
Q. Hypersorption refers to a __________ process.
a. Fixed bed absorption
b. Moving bed absorption
c. Fixed bed adsorption
d. Moving bed adsorption
Q. Drying of refractory is normally carried out in a __________ dryer.
a. Open pan
b. Tray
c. Rotary vacuum
d. Truck/tunnel
Q. For the same feed, feed quality and separation (in a distillation column), with the increaseof total pressure, the number of ideal plates will
a. Increase
b. Decrease
c. Remain same
d. Data insufficient, can't be predicted
Q. A liquid mixture contains 30% o-xylene, 60% p-xylene and 10%. m-xylene (all percentages in w/w). Which of the following statements would be true in respect of this mixture?
a. The mixture exhibits an azeotrope at 101.3 kPa
b. The composition of the mixture, in percent by volume is: o-xylene 30, p-xylene 60. and m- xylene 10
c. The composition of the mixture in mole percent is: o-xylene 30, p-xylene 60 and m-xyoene 10
d. The mixture contain optical isomers
Q. The relative saturation of an unsaturated mixture of gas and vapor is independent of the
a. Nature of the vapor
b. Temperature of the mixture
c. Composition of the mixture
d. None of these