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Civil Engineering - Waste Water Engineering

Exercise : Waste Water Engineering - Section 2
1.
The most dangerous pollutant in vehicular emissions is
CO
SO2
CO2
O3.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
2.
If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20°C, B.O.D. of the sewage is
50 mg/l
100 mg/l
150 mg/l
200 mg/l
250 mg/l.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
3.
The clarigesters are
circular septic tanks
rectangular septic tanks
circular Imhoff double tanks with bottom hoppers
circular Imhoff double storey tanks without bottom hoppers.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
4.
Rate of flow of sewage is generally assumed
more than the rate of water supply
equal to the rate of water supply
less than the rate of water supply
at 150 litres per capita.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
5.
Maximum permissible velocity 1.5 m/sec, is adopted in drains
with beds of rocks and gravels
lined with stones
both (a) and (b)
neither (a) nor (b).
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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