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Chemical Engineering - Environmental Engineering

Exercise : Environmental Engineering - Section 1
21.
Scale formation in boiler is controlled by
preheating of feed water.
reduction in hardness, silica & alumina in feed water.
keeping the pH value of feed water just below 7.
eliminating H2S in feed water.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
Noise level heard at a distance of about 100 metres from a jet engine with after burner is about __________ decibels.
120
140
170
200
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
TLV of mercury in potable (drinking) water is about __________ ppm.
0.001
0.1
1
5
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.
Which is the best and the most effective method for the removal of organic contaminant present in the polluted water in very small quantity (say < 200 mg/litre)?
Lagooning
Activated carbon adsorption
Biological oxidation pond
Chemical coagulation
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
Which is a secondary air pollutant ?
Photochemical smog
Sulphur dioxide
Nitrogen dioxide
Dust particles
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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