Practice Resistance In Mass Transfer (2.2) - Air-Water Exchange - Environmental Quality Monitoring & Analysis, - Vol 5

Practice: Resistance in Mass Transfer

Lesson 2.2Air-Water Exchange

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9 questions

Flashcard drill
3 cards from this section. Quick, good the night before a test.
Exercise
6 questions · about 4 min · pass mark 70%. Hints available.
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Quiz
3 questions · about 2 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
Define mass transfer resistance in your own words.
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Think about the factors affecting pollutant transfer.
Question 2.
What is mixing height?
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Relate it to how pollutants would behave once released.
3Question 3.
What does mass transfer resistance refer to?
- A barrier to energy transfer
- A barrier to pollutant transfer
- A type of fluid mechanics
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Think about what limits pollutant exchange.
4Question 4.
True or False: Higher mixing heights generally result in lower pollutant concentrations at ground level.
- True
- False
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Consider how pollutants spread with height.
Question 5.
A pollutant is released into a lake. After one hour, its concentration is measured at 300 mg/L in the water. If the evaporation rate is 10 mg/L per hour, calculate the rate of accumulation and prepare the mass balance equation.
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Remember to identify all terms in the mass balance equation.
Question 6.
Consider a scenario where pollutant x evaporates from a still lake surface at a concentration of 200 mg/L. If the ambient air concentration is zero, and kA2 = 0.25 m/s, calculate the flux and explain its implications.
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Identify concentration gradients as driving forces for mass transfer.

5 more questions in this section. Enroll free to practise them all.