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The ratio of maximum sewage flow to average sewage flow for mains up to 1 m in diameter, is___________________? A. 1.5B. 2.0 C. 3.0 D. 4.0
In a grit chamber of a sewage treatment plant ____________________? A. Flow velocity 0.15 m to 0.3 m/sec is kept B. Depth of 0.9 m to 1.20 m is kept C. One minute of detention period is keptD. All the above
Lead acetate test in sewer manhole is done to test the presence of ____________________? A. Methane gasB. Hydrogen sulphide C. Carbondioxide gas D. Diesel vapours
Setting out the alignments of sewers may start from__________________? A. City B. Out-fallC. Tail end D. Any point
The most widely used pump for lifting sewage is_________________? A. Centrifugal pump B. Reciprocating pump C. Pneumatic ejector D. Air pressure pump
Cement concrete sewers are only suitable if non-scouring velocity is between_________________? A. 2.5 to 3.0 m/sec B. 3.0 to 4.0 m/sec C. 3.5 to 4.5 m/sec D. 4.5 to 5.5 m/sec
Primary treatment of sewage consists of removal of__________________? A. Large suspended organic solids B. Oil and grease C. Sand and girt D. Floating materials
The bottom of the sewage inlet chamber of septic tanks, is provided an outward slope_________________? A. 1 in 5B. 1 in 10 C. 1 in 15 D. 1 in 20
Which one of the following part of human body withstands minimum radiation ? A. Thyroid B. Kidneys C. EyesD. Ovaries/testis
The intensity of rain is expressed in________________? A. cm/minuteB. cm/hour C. cm/day D. None of these