Q. For house drainage minimum gradient is

View solution

Q. If the side of a square sewer is 1000 mm, the diameter of a hydraulically equivalent circular section, is

View solution

Q. The ratio of minimum hourly flow to the average flow of sewage is

View solution

Q. Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to

View solution

Q. The sewage is pumped up

View solution

Q. Removal of oil and grease from sewage, is known

View solution

Q. The gas which may cause explosion in sewers, is

View solution

Q. In sewers the effect of scouring is more on

View solution

Q. If the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is

View solution

Q. Pick up the correct statement from the following :

View solution

Q. The non-clog pump which permits solid matter to pass out with the liquid sewage, is

View solution

Q. Assertion (A) : Discharging the effluents from the oxidation ponds just up stream of lakes or reservoirs is undesirable.

Reason (R) : The discharged algae get settled in the reservoirs and cause anaerobic decomposition and other water qualities.

View solution

Q. The width of a rectangular sewer is twice its depth while discharging 1.5 m/sec. The width of the sewer is

View solution

Q. Flocculated particles do not change their

View solution

Q. For non-scouring velocity 5 m/sec, the type of sewers generally preferred to, is

View solution

Q. Disposal to sewage in large cities, is done in

View solution

Q. For the COD test of sewage, organic matter is oxidised by K₂Cr₂0₇ in the presence of

View solution

Q. In R.C. sewer pipes, the percentage longitudinal reinforcement to the cross-sectional area of concrete is kept

View solution

Q. The dimensions of a rectangular settling tank are : length 24 m, width 6 m and depth 3 m. If 2 hour detention period for tanks is recommended, the rate of flow of sewage per hour, is

View solution

Q. The screens are fixed

View solution