281. Out of the following gas-liquid contacting devices, for a given set of operating conditions, gas pressure drop is the least in __________ tower.
Wetted wall
Bubble cap
Perforated tray
Packed
✅ The correct answer is option A.
Mass Transfer MCQs
282. Which of the following adsorbent is used to decolourise yellow glycerine?
Silica gel
Alumina
Fuller
Activated carbon
✅ The correct answer is option D.
283. In a distillation operation, what is the effect of the temperature of the reflux stream (given below) on the condenser and reboiler loads? Reflux conditions: (i) Reflux stream is completely liquid and is at its bubble point. (ii) Reflux stream is below its bubble point.
Condenser and reboiler loads are the same in both the cases
Reboiler load is the same in both the cases but condenser load is higher in case (ii)
Condenser load is the same in both the cases but reboiler load is higher in case (ii)
Both condensor and reboiler loads are higher in case (ii) as compared to case (i)
✅ The correct answer is option D.
284. Corresponding to Nusselt number in heat transfer, the dimensionless group in mass transfer is the __________ number.
Sherwood
Schmidt
Peclet
Stanton
✅ The correct answer is option A.
285. In triangular co-ordinates, the ternery composition point falls __________ of the triangle.
In the corners
Inside
On the sides
None of these
✅ The correct answer is option B.
286. Paper industry employs __________ driers.
Cylinder
Rotary
Spray
Fluidised bed
✅ The correct answer is option A.
287. Which of the following is not a batch drier?
Truck drier
Agitated pan drier
Fluidised bed drier
Vacuum shelf drier
✅ The correct answer is option C.
288. Sand is dried in foundaries in a___drier.
Rotary
Fluidisedbed
Vacuum
Spray
✅ The correct answer is option B.
289. Weeping in a distillation column
Increases tray efficiency
Provides large interfacial surface for mass transfer
Results due to very high gas velocity
Results due to very low gas velocity
✅ The correct answer is option D.
290. During sensible cooling process
Relative humidity decreases
Relative humidity increases
Wet bulb temperature decreases
Both B and C
✅ The correct answer is option D.