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Environmental Engineering - Interview Questions and Answers

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116. The type of valve which is provided to control the flow of water in the distribution system at street corners and where the pipe lines intersect is
A. check valve
B. sluice valve
C. safety valve
D. scour valve
Explanation:
117. The main disadvantage of cement concrete sewers is
A. less strength
B. difficulty in construction
C. difficulty in transportation due to heavy weight
D. less life
Explanation:
118. If the time of concentration is 9 minutes, then the intensity of rainfall according to British Ministry of Health formula will be
A. 4 mm/hr
B. lOmm/hr
C. 20 mm/hr
D. 40 mm/hr
Explanation:
119. The type of valve which allows water to flow in one direction but prevents its flow in the reverse direction is
A. reflux valve
B. sluice valve
C. air relief valve
D. pressure relief valve
Explanation:
120. The design discharge for the separate sewer system shall be taken as
A. equal to dry weather flow (DWF)
B. 2xDWF
C. 3 x DWF
D. 6xDWF
Explanation:
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