Removal of oil and grease from sewage, is known
Chlorination of water is done for the removal of
Clogging of sewers, is caused due to
If the diameter of sewer ismm, the gradient required for generating self cleansing velocity, is
A sewer running partially full and hurried with back filled, fails in compression due to
In sewers the highest non-scouring velocity is achieved in
The digested sludge from septic tanks, is removed after a maximum period of
Fresh sewage may become stale in
For non-scouring velocity 5 m/sec, the type of sewers generally preferred to, is
For house drainage minimum gradient is
In a fully mechanised composting plant, involves
A rainfall may be classified as acidic if its pH value is less or equal to
The gas which may cause explosion in sewers, is
For evaporation and measurement of settlable solids, the apparatus used, is
A sewer pipe contains 1 mm sand particles of specific gravity 2.and 5 mm organic particles of specific gravity 1.the minimum velocity required for removing the sewerage, is
Pick up the correct statement from the following :
The dimensions of a rectangular settling tank are : lengthm, 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
A manhole is classified as shallow if its depth is between
In sewage having fully oxidised organic matter, the nitrogen exists in the form of
For providing an Indian type W.C., the R.C.C. slabs in the toilet portion
The dimensions of a rectangular settling tank are : lengthm, 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
The small sewers are cleaned by
In septic tanks,
The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is
Disposal to sewage in large cities, is done in
If the side of a square sewer ismm, the diameter of a hydraulically equivalent circular section, is
Self-cleansing velocity is
When drainage to sewage ratio isthe peak dry weather flow is
In sewers the effect of scouring is more on
In SI units the power of sound is represented in
Sewer ventilating columns are generally placed at
The coagulant widely used for sewage treatment, is
The non-clog pump which permits solid matter to pass out with the liquid sewage, is
The screens are fixed
It is customary to design a sewer for D.W.F. on the basis of
The gradient of sewers depends upon
Dry water flow in a combined sewer, is
The sewer pipe which carries sewage from a building for immediate disposal is
Pick up the correct statement from the following :
For the COD test of sewage, organic matter is oxidised by K2Cr207 in the presence of
The ratio of minimum hourly flow to the average flow of sewage is
For treating the sewage of a large city, you will recommend
A rain sanitary sewer is constructed to carry
For design purposes, the normal rate of infiltration of ground water into the sewer, is
In case of Imhoff tanks,
House connections to the laterals is generally made by
For design purposes, the normal rate of infiltration of ground water into the sewer, is
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.
In primary sedimentation, the 0.2 mm inorganic solids get separated if specific gravity is
During preliminary treatment of a sewage