Civil Engineering - Waste Water Engineering

31. 

For sewers, inverted siphon is provided for

A. one pipe
B. two pipes
C. three pipes
D. four pipes.

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

32. 

The coagulant which is generally not used for treating the sewage, is

A. alum
B. ferric chloride
C. ferric sulphate
D. chlorinated copperas.

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

33. 

Fresh sewage is generally

A. alkaline
B. acidic
C. highly decomposed
D. a source of objectionable odour.

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

34. 

In a trickling filter

A. filtration process is used
B. biological action is used
C. neither (a) nor (b)
D. both (a) and (b).

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

35. 

If the flame of a miner's safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains

A. Hydrogen sulphide
B. Carbon dioxide
C. Methane
D. Oxygen
E. None of these.

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.