541. Fenske equation determines the
Maximum number of ideal plates
Height of the distillation column
Minimum number of theoretical plates
Optimum reflux ratio
✅ The correct answer is option C.
Mass Transfer MCQs
542. __________ extractor is used for the concentration of radioactive nuclear waste.
Pulsed column
Seive plate
Mixer-settler
Ballman
✅ The correct answer is option A.
543. The interfacial area per unit volume of dispersion, in a gas-liquid contactor, for fractional hold up of gas = 0.1 and gas bubble diameter = 0.5 mm is given by (in m²/m³)
500
1200
900
800
✅ The correct answer is option A.
544. In case of binary distillation, increasing the reflux ratio above optimum does not result in the increase of
Area between operating line and 45° diagonal x-y diagram
Condenser and reboiler surfaces
Tower cross-section
None of these
✅ The correct answer is option A.
545. Moisture content of a substance when at equilibrium with a given partial pressure of the vapour is called the __________ moisture.
Free
Unbound
Equilibrium
Bound
✅ The correct answer is option C.
546. __________ is the temperature at which a gas-vapor mixture becomes saturated, when cooled at constant total pressure out of contact with a liquid.
Dew point
Bubble point
Dry bulb temperature
Wet bulb temperature
✅ The correct answer is option A.
547. The change in enthalpy per unit weight of adsorbed gas when adsorbed on gas free or “outgassed” adsorbent to from a definite concentration of adsorbate is called its
Integral heat of adsorption
Heat of wetting
Differential heat of adsorption
Heat of normal condensation
✅ The correct answer is option A.
548. Overall efficiency of the distillation column is
The ratio of number of ideal plates to actual plates
The ratio of number of actual plates to ideal plates
Same as the Murphree efficiency
Always more than the point efficiency
✅ The correct answer is option A.
549. Dimension of mass diffusivity is the same as that of
Kinematic viscosity
Dynamic viscosity
Surface tension
Pressure
✅ The correct answer is option A.
550. Which is not concerned directly with mass transfer?
Schmidt number
Sherwood number
Lewis relationship
Froude number
✅ The correct answer is option D.