Decreases
Increases
Depends on the extent of heating
Remain unchanged
✅ The correct answer is option B.
Mass Transfer MCQs
In case of an ideal solution, the total vapor pressure varies __________ with the composition expressed as mole fraction,
Inversely
Linearly
Exponentially
None of these
✅ The correct answer is option B.
Diffusion co-efficient generally depends upon the temperature, pressure & the nature of the components of the system. Its dimension is not the same as that of the
Mass transfer co-efficient
Thermal diffusivity
Kinematic viscosity
Volumetric diffusivity
✅ The correct answer is option A.
The solvent used in liquid-liquid extraction should have __________ less than one.
Selectivity
Distribution co-efficient
Both A & B
Neither A nor B
✅ The correct answer is option D.
Rate of leaching increases with increasing
Temperature
Viscosity of solvent
Pressure
Size of the solid
✅ The correct answer is option A.
Which of the following remains constant during evaporative cooling process with recirculated water supply?
Relative humidity
Partial pressure of vapour
Wet bulb temperature
None of these
✅ The correct answer is option C.
Molecular diffusivity of a liquid
Increases with temperature
Decreases with temperature
May increase or decrease with temperature
Is independent of temperature
✅ The correct answer is option A.
Humid volume is the total volume in m³ of 1 kg of
Vapour laden gas at 1 atm. and room temperature
Gas plus its accompanying vapour at 1 atm. and room temperature
Gas plus its accompanying vapour at 1 atm. and gas temperature
Vapour laden gas at 1 atm. and gas temperature
✅ The correct answer is option C.
Priming in a distillation column
Results from very low gas velocity
Is desirable from point efficiency consideration
Is characterised by the presence of foam throughout the space between trays
Reduces the overall pressure drop
✅ The correct answer is option C.
The reason for preferring packed towers over plate towers in distillation practice is that the packed tower operation gives
Low pressure drop and high hold up
High pressure drop and low hold up
Low pressure drop and low hold up
High pressure drop and high hold up
✅ The correct answer is option C.