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Civil Engineering - Waste Water Engineering

Exercise : Waste Water Engineering - Section 4
21.
In a residential colony, sewers of diameters 100 mm, 150 mm and 225 mm were laid with a gradient 1 in 120. Which portion of the sewage system does not choke in due course of time
100 mm dia.
150 mm dia.
225 mm dia.
all of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
If D is the diameter of upper circular portion, the overall depth of New Egg shaped sewer section, is
1.250 D
1.350 D
1.425 D
1.625 D.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
During putrifaction process of sewage the gas given off, is
carbon dioxide
hydrogen
ammonia
methane
all the above.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.
A circular sewer section is preferred to because
it is cheaper in construction
it provides maximum area for a given perimeter
it provides maximum hydraulic mean depth
all the above.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.

Assertion (A) : The minimum self cleansing velocity in the sewer, at least once a day, must be generated.

Reason (R) : If certain deposition takes place and is not removed, it obstructs free flow and causes further deposition leading to complete blocking of the sewer.

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.
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