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Environmental Engineering - Interview Questions and Answers

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126. The design discharge for the combined sewer system shall be taken as
A. equal to rainfall
B. rainfall + DWF
C. rainfall + 2 DWF
D. rainfall + 6 DWF
Explanation:
127. Scour valves are provided
A. at street corners to control the flow of water
B. at every depression and dead ends to drain out the waste water that may collect there
C. at the foot of rising main along the slope to prevent back running of water
D. at every summit of rising mains
Explanation:
128. The time of concentration is defined as
A. the time taken by rainfall water to run from most distant point of water shed to the inlet of sewer
B. the time required for flow of water in sewer to the point under consideration
C. sum of (a) and (b)
D. difference of (a) and (b)
Explanation:
129. Average rate of water consumption perhead per day as per Indian Standard is
A. 100 litres
B. 135 litres
C. 165 litres
D. 200 litres
Explanation:
130. A pipe conveying sewage from plumbing system of a single building to common sewer or point of immediate disposal is called
A. house sewer
B. lateral sewer
C. main sewer
D. submain sewer
Explanation:
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