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Chemical Engineering - Mass Transfer

Exercise : Mass Transfer - Section 9
31.
In case of cooling towers, the ratio of the rates of heat and mass transfer is indicated by the __________ number.
Lewis
Grashoff
Sherwood
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
32.
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
Answer: Option
Explanation:
No answer description is available. Let's discuss.
33.
The temperature of water cooled in cooling tower is always __________ temperature of entering air.
more than the wet bulb
less than the wet bulb
equal to the wet bulb
equal to the dry bulb
Answer: Option
Explanation:
No answer description is available. Let's discuss.
34.
Which of the following processes is followed by unsaturated air (with dry bulb temperature 12°C and relative humidity 47%) passing through water spray washer (temperature of water being constant at 40°C?
Humidification only
Heating only
Both heating and humidification
Evaporative cooling
Answer: Option
Explanation:
No answer description is available. Let's discuss.
35.
Mass transfer co-efficient is directly proportional to DAB according to the __________ theory.
film
penetration
surface-renewal
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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