Increases with increase in
Is one at unity value of
Both A and B
Neither A nor B
✅ The correct answer is option C.
Mass Transfer MCQs
192. For the same process conditions, the reflux ratio of an unlagged distillation column
Decreases in winter
Increases in winter
Increases in summer
None of these
✅ The correct answer is option B.
193. The fixed cost of a distillation column at minimum reflux ratio is
Minimum
Infinite
Optimum
None of these
✅ The correct answer is option B.
194. Which one of the following devices is not used for both the absorption as well as the liquid-liquid extraction processes?
Packed towers
Plate towers
Spray towers
Wetted wall columns
✅ The correct answer is option D.
195. The value of L/mG ratio for economical absorption operation ranges from
0.5 to 0.8
0.8 to 1.2
1.25 to 2.0
2.5 to 3.5
✅ The correct answer is option C.
196. Which of the following increases during evaporative cooling process with recirculated water supply?
Wet bulb temperature
Relative humidity
Partial pressure of vapour
Both B and C
✅ The correct answer is option D.
197. The efficiency of a plate column will be maximum, when the flow is ideal __________ the plate.
Across
Above
Both A & B
Neither A nor B
✅ The correct answer is option C.
198. The cooling effect in a cooling tower can be speeded up by
Increasing the air velocity and area of exposed wet surface
Reducing the barometric pressure
Reducing the humidity of the air
All of the above
✅ The correct answer is option D.
199. Which of the following provides maximum contact surface for a liquid-vapour system?
Packed tower
Bubble-cap plate column
Seive-plate column
Wetted wall column
✅ The correct answer is option A.
200. Which of the following parameters remains almost constant during adiabatic saturation of unsaturated air?
Dry bulb temperature
Dew point
Wet bulb temperature
None of these
✅ The correct answer is option C.