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Environmental Engineering - Interview Questions and Answers

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21. Corrosion in concrete sewers is caused by
A. septic conditions
B. dissolved oxygen
C. chlorine
D. nitrogen
Explanation:
22. The relative stability of a sewage sample, whose dissolved oxygen is same as the total oxygen required to satisfy BOD, is
A. 1
B. 100
C. infinite
D. zero
Explanation:
23. Sewage treatment units are designed for
A. maximum flow only
B. minimum flow only
C. average flow only
D. maximum and minimum flow
Explanation:
24. The hourly variation factor is usually taken as
A. 1.5
B. 1.8
C. 2.0
D. 2.7
Explanation:
25. Standard BOD is measured at
A. 20�C - 1day
B. 25�C- 3day
C. 20�C - 5day
D. 30�C- 5day
Explanation:
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