7561. __________ number indicates the ratio of the rates of the heat and mass transfer incase of a cooling tower.
Sherwood
Stanton
Lewis
Peclet
✅ The correct answer is option C.
Chemical Engineering
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7562. If the path of liquid across the plate is very long as in case of large diameter tower, Murphree efficiency can be __________ percent.
100
> 100
< 100
None of these
✅ The correct answer is option B.
7563. Component A is diffusing in a medium B. The flux NA relative to a stationary point is equal to the flux due to molecular difusion, if
Mass transfer is accompanied by reaction
Diffusion of A is in stagnant medium B
Molecular mean free path is high
There is equimolar counter diffusion
✅ The correct answer is option D.
7564. At a given equilibrium pressure, with increase in temperature, the concentration of adsorbed gas on solid adsorbant
Increases
Decreases
Remains unchanged
Increases exponentially
✅ The correct answer is option B.
7565. Moisture in a solid exerting an equilibrium vapour pressure equal to that of the pure liquid at the same temperature is called the __________ moisture.
Unbound
Critical
Free
Bound
✅ The correct answer is option A.
7566. The solvent used in liquid extraction should not have high latent heat of vaporisation, because
The pressure drop and hence the pumping cost will be very high
It cannot be recovered by distillation
Its recovery cost by distillation may be prohibitatively high
It will decompose while recovering by distillation
✅ The correct answer is option C.
7567. The process employing desorption of the absorbed solute by a solvent is called
Elution
Osmosis
Reverse osmosis
Sublimation
✅ The correct answer is option A.
7568. Tower diameter may be decreased by
Using higher reflux ratio
Use of increased tray spacing
Increasing the liquid flow rate
Increasing the vapour flow rate
✅ The correct answer is option B.
7569. The relative saturation of a partially saturated mixture of vapour and gas can be increased by __________ of the mixture.
Reducing the total pressure
Increasing the total pressure
Reducing the temperature
Both B and C
✅ The correct answer is option D.
7570. Pick out the wrong statement pertaining to the analogy between equations of heat and mass transfer operations.
Sherwood number in mass transfer is analogous to Nusselt number in heat transfer
Prandtl number in heat transfer is analogous to Schmidt number in mass transfer
Reynolds number in mass transfer is analogous to Grashoff number in heat transfer
Reynolds number remains the same in both heat and mass transfer
✅ The correct answer is option C.