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Civil Engineering - Waste Water Engineering

Exercise : Waste Water Engineering - Section 1
6.
If the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is
1 in 60
1 in 100
1 in 120
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
7.
Pick up the correct statement from the following :
pH value indicates acidity and alkalinity of sewage
In acidic sewage, the pH value is less than 7
In alkaline sewage, the pH value is more than 7
Fresh sewage is generally alkaline
All the above.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
8.
The non-clog pump which permits solid matter to pass out with the liquid sewage, is
centrifugal pump
reciprocating pump
pneumatic ejector
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
9.

Assertion (A) : Discharging the effluents from the oxidation ponds just up stream of lakes or reservoirs is undesirable.

Reason (R) : The discharged algae get settled in the reservoirs and cause anaerobic decomposition and other water qualities.

Both A and R are true and R is the correct explanation of A
Both A and R are true but R is not a correct explanation of A
A is true but R is false
A is false but R is true.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
10.
The width of a rectangular sewer is twice its depth while discharging 1.5 m/sec. The width of the sewer is
0.68 m
0.88 m
1.36 m
1.76 m.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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