501. In a distillation column, with increase in the reflux ratio, the heat removed in the cooler
Increases
Decreases
Remains unaffected
And the heat required in reboiler decreases
✅ The correct answer is option A.
Mass Transfer MCQs
502. Moisture contained by a substance in excess of the equilibrium moisture is called the __________ moisture.
Unbound
Free
Critical
Bound
✅ The correct answer is option B.
503. Reboiler is considered as one theoretical plate, because
Of the assumption that vapour and liquid leaving the reboiler are in equilibrium
Vapour is recycled to the column
Reboiler itself contains one plate
None of these
✅ The correct answer is option A.
504. __________ columns are used for liquid dispersion in a continuous gas phase.
Packed
Pulse
Bubble cap
Sieve plate
✅ The correct answer is option A.
505. In physical terms, Schmidt number means
Thermal diffusivity/mass diffusivity
Thermal diffusivity/momentum diffusivity
Momentum diffusivity/mass diffusivity
Mass diffusivity/thermal diffusivity
✅ The correct answer is option C.
506. Can the efficiency of a plate in the distillation tower be greater than 100%?
Yes
Normally not; but is possible if infinite number of plates are put
Never
Yes ; if the reflux ratio is maximum
✅ The correct answer is option C.
507. Mass transfer rate between two fluid phases does not necessarily depend on the __________ of the two phases.
Chemical properties
Physical properties
Degree of turbulence
Interfacial area
✅ The correct answer is option A.
508. HETP is numerically equal to HTU, only when the operating line
Lies below the equilibrium line
Lies above the equilibrium line
And equilibrium lines are parallel
Is far from the equilibrium line
✅ The correct answer is option C.
509. Moisture in a substance exerting an equilibrium vapour pressure less than that of pure liquid at the same temperature is called the __________ moisture.
Bound
Unbound
Critical
None of these
✅ The correct answer is option A.
510. In the constant rate period of the rate of drying curve for batch drying,
Cracks develop on the surface of the solid
Rate of drying decreases abruptly
Surface evaporation of unbound moisture occurs
None of these
✅ The correct answer is option C.