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Chemical Engineering - Environmental Engineering

Exercise : Environmental Engineering - Section 5
36.
The average thickness of ozone layer in stratosphere is about __________ dobson unit (DU).
20
230
750
1500
Answer: Option
Explanation:
No answer description is available. Let's discuss.
37.
Polyvinyl chloride containers are not suitable for storing
foodstuffs
woolen clothes
metallic powder
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
38.
Presence of nitrogen in high concentration in contaminated air reduces partial pressure of oxygen in lungs, thereby causing asphyxia (suffocation) leading to death from oxygen deficiency. Concentration of N2 in contaminated air at which it acts as a natural asphyxant is ≥ __________ percent.
84
88
80
92
Answer: Option
Explanation:
No answer description is available. Let's discuss.
39.
TLV of ammonia, nitrogen dioxide and phenol vapor in air is __________ ppm.
5
100
1000
2000
Answer: Option
Explanation:
No answer description is available. Let's discuss.
40.
Corrosion in boilers can be prevented by
deaeration of feed water.
enhancing pH of feed water by adding alkali.
feeding sodium sulphite or hydrazine phosphate to the boilers, which combines with oxygen and prevents corrosion.
all (a), (b) and (c).
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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