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Civil Engineering - Waste Water Engineering

Exercise : Waste Water Engineering - Section 7
11.
Pick up the incorrect statement from the following for allowing workers to enter sewers
The particular manhole and one manhole on up stream and one manhole on down stream should remain open for 30 minutes
Proper tests for the presence of poisonous gases must be carried out
The men entering the manhole should be advised to smoke in the sewer
Warning signals should be erected
None of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
12.
The settling velocity of a spherical particle of diameter less than 0.1 mm as per Stock's law, is
Answer: Option
Explanation:
No answer description is available. Let's discuss.
13.
In a grit chamber of a sewage treatment plant,
flow velocity 0.15 m to 0.3 m/sec is kept
depth of 0.9 m to 1.20 m is kept
one minute of detention period is kept
all the above.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
14.
The rate of accumulation of sludge per person per year, is
10 litres
15 litres
20 litres
25 litres
30 litres.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
15.
The disintegrating pump in which solid matter is broken up before passing out, is
centrifugal pump
reciprocating pump
pneumatic ejector
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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