91. Physical absorption is
An irreversible phenomenon
A reversible phenomenon
Accompanied by evolution of heat
Both B & C
✅ The correct answer is option D.
Mass Transfer MCQs
92. Which of the following equipments is not used for liquid dispersion?
Wetted wall towers
Packed towers
Venturi scrubbers
Agitated vessels
✅ The correct answer is option D.
93. Use of natural draft cooling tower is practised, when the air has low
Humidity
Temperature
Both A & B
Neither A nor B
✅ The correct answer is option C.
94. According to Poiseuille’s law, the permeability for gas flow through a capillary is proportional to (where, μ = gas viscosity)
μ
1/μ
√μ
μ²
✅ The correct answer is option B.
95. Unit of molal diffusivity is
Cm²/sec gm . mole
Gm moles/cm² . sec
Gm moles/cm. sec
Gm moles/cm². sec
✅ The correct answer is option C.
96. Which of the following has the same dimension as mass diffusivity?
Momentum flux
Kinematic viscosity
Thermal diffusivity
Both A & B
✅ The correct answer is option D.
97. 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.
Less than
More than
Same as
Very much less
✅ The correct answer is option B.
98. Which of the following assumes constant molal vaporisation and overflow?
McCabe-Thiele method
Ponchan-Savarit method
Enthalpy concentration method
Plate absorption column
✅ The correct answer is option A.
99. Corresponding to Prandtl number in heat transfer, the dimensionless group in mass transfer is the __________ number.
Schmidt
Sherwood
Peclet
Stanton
✅ The correct answer is option A.
100. Detergent solution is dried to a powder in a
Spray dryer
Spouted bed dryer
Tunnel dryer
Pan open to atmosphere
✅ The correct answer is option A.