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Environmental Engineering - Interview Questions and Answers

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46. The most common cause of acidity in water is
A. carbon dioxide
B. oxygen
C. hydrogen
D. nitrogen
Explanation:
47. Septic tank is a i) settling tank ii) digestion tank iii) aeration tank The correct answer is
A. only (i)
B. (i) and (ii)
C. (i) and (iii)
D. only (iii)
Explanation:
48. For the same solid content, if the quantity of sludge with moisture content of 98% is X, then the quantity of sludge with moisture content of 96% will be
A. X/4
B. X/2
C. X
D. 2X
Explanation:
49. For normal sludge, the value of sludge index for Indian conditions is
A. 0 to 50
B. 50 to 150
C. 150 to 350
D. 350 to 500
Explanation:
50. The process of lagooning is primarily a means of
A. reducing the excessive flow in sewers
B. disposing of sludge
C. increasing the capacity of storage re-servoirs
D. increasing flow of sewage through imhoff tanks
Explanation:
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