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Chemical Engineering - Mass Transfer

Exercise : Mass Transfer - Section 8
21.
The overall mass transfer co-efficient for the absorption of SO2 in air with dilute NaOH solution can be increased substantially by
increasing the gas film co-efficient.
increasing the liquid film co-efficient.
increasing the total pressure.
decreasing the total pressure.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
Flooding results in
high tray efficiency
low tray efficiency
high gas velocity
good contact between the fluids
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
For the air water system under ambient conditions, the adiabatic saturation temperature and the wet bulb temperature are nearly equal, because
water has a high latent heat of evaporation.
Lewis number is close to unity.
they are always equal under all circumstances.
solubility of the components of air in water is very small.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.
In an operating distillation column, the
vapors and liquids are at their dew point and bubble point respectively
driving force for the liquid flow is its specific weight.
driving force for the vapor flow is the pressure drop, as the pressure decreases gradually from the bottom to the top of the column.
highest temperature is encountered at the top of the column.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the
range is 15°F.
approach is 10°F.
both (a) & (b).
neither (a) nor (b).
Answer: Option
Explanation:

Temperature range (T1 - T2) = 15°F.

Temperature approach (T2 - tw) = 10°F.

Wet-bulb temperature tw = 70°F.

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