Dew point
Wet bulb
Dry bulb
None of these
✅ The correct answer is option D.
Chemical Engineering MCQs
Which of the following can be calculated theoretically using steam table and Dalton’s law of partial pressure; if the relative humidity and dry bulb temperature of moist air is known?
Dew point
Humidity ratio
Wet bulb temperature
None of these
✅ The correct answer is option C.
Mechanism of moisture removal in case of freeze drying of food stuff is by
Evaporation
Sublimation
Dehydration
Adsorption
✅ The correct answer is option B.
Cox chart, which is useful in the design of distillation column particularly for petroleum hydrocarbons, is a plot of (where, P = vapor pressure, T = temperature)
Log P vs . T
Log P vs. log T
T vs . P
P vs . log T
✅ The correct answer is option A.
With increase in gas rate, the number of transfer units, NtoG, for a fixed degree of absorption by a fixed amount of solvent
Increases
Decreases
Decreases linearly
Remains unaffected
✅ The correct answer is option A.
When the liquid phase and vapour phase of a binary system obeys Raoult’s and Dalton’s law respectively, the relative volatility is the ratio of
Vapour pressure of component A to that of component B
Vapour pressure of component A to the total pressure
Vapour pressure of component A to the partial pressure of A
Partial pressure of component A to the total pressure
✅ The correct answer is option A.
Percentage saturation is __________ the relative saturation.
Always smaller than
Always greater than
Not related to
None of these
✅ The correct answer is option A.
During the constant rate period of drying of a solid,
Increased air humidity decreases the rate of drying
Increasing the air temperature decreases the drying rate
Surface evaporation of unbound moisture occurs
None of these
✅ The correct answer is option C.
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?
The mixture exhibits an azeotrope at 101.3 kPa
The composition of the mixture, in percent by volume is: o-xylene 30, p-xylene 60. and m-xylene 10
The composition of the mixture in mole percent is: o-xylene 30, p-xylene 60 and m-xyoene 10
The mixture contain optical isomers
✅ The correct answer is option A.
In case of cooling towers, the ratio of the rates of heat and mass transfer is indicated by the __________ number.
Lewis
Grashoff
Sherwood
None of these
✅ The correct answer is option A.