71. Which of the following chemical compounds can be used for de-chlorination of water?
72. 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
73. The suitable method for disinfection of swimming pool water is
74. The detention period and overflow rate respectively for plain sedimentation as compared to sedimentation with coagulation are generally
75. Disinfection efficiency is
76. The time of concentration is defined as
77. The velocity of flow of water in a sedimentation tank is about
78. Hardy cross method of analysis of distribution system
(i) Involves successive trials
(ii) Takes economic aspects into account
(iii) Is time consuming
(i) Involves successive trials
(ii) Takes economic aspects into account
(iii) Is time consuming
79. A pipe conveying sewage from plumbing system of a single building to common sewer or point of immediate disposal is called
80. The depression of water table in a well due to pumping will be maximum
(Where ‘R’ is the radius of influence)
(Where ‘R’ is the radius of influence)
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