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Chemical Engineering - Mass Transfer

Exercise : Mass Transfer - Section 4
11.
The cooling effect in a cooling tower can not be increased by
increasing the air velocity over the wet surfaces.
reducing the humidity of entering air.
lowering the barometric pressure.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
12.
The value of NA/(NA + NB) for steady state molecular diffusion of gas 'A' through non-diffusing gas 'B' is
1
∞
0.5
2
Answer: Option
Explanation:
No answer description is available. Let's discuss.
13.
The humid volume may be increased by increasing the
temperature at constant humidity.
humidity at constant temperature.
both (a) and (b).
neither (a) nor (b).
Answer: Option
Explanation:
No answer description is available. Let's discuss.
14.
Pick out the wrong statement
Co-current absorbers are usually used, when the gas to be dissolved in the liquid is a pure substance.
In case of gas absorption, HETP is equal to HTU, when both the operating line & the equilibrium lines are parallel.
Hatta number is important in case of gas absorption with chemical reaction.
In actual practice, absorption is an en-dothermic process, while stripping is an exothermic process.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
15.
When the mixture to be distilled has a very high boiling point and the product material is heat sensitive, the separation technique to be used is __________ distillation.
continuous
steam
azerotropic
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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