71. Which one of the following resists hydrogen sulphide corrosion?
72. The gas evolved in sewers is
73. The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is
74. Pick up the correct statement from the following:
75. Pick up the correct statement from the following:
76. The ratio of maximum sewage flow to average sewage flow for mains up to 1 m in diameter, is
77. The sewerage system originates from
78. The digested sludge from septic tanks, is removed after a maximum period of
79. The underground sewers are more subjected to
80. The formula which accepts the value of rugosity coefficient n = 0.012 to be used in Manning’s formula, is given by
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