The settling velocity of the particles larger than 0.mm in a settling tank of depth 2.4 is 0.m per sec. The detention period recommended for the tank, is
Which one of the following tests is used for testing sewer pipes :
The algae dies out in the zone of
For trunk and out-fall, the type of sewers generally used, is
In R.C. sewer pipes, the percentage longitudinal reinforcement to the cross-sectional area of concrete is kept
Bio-chemical oxygen demand (BOD) for the firstdays in generally referred to
The effluent of a septic tank is
The ratio of maximum sewage flow to average sewage flow for mains up to 1 m in diameter, is
The width of a rectangular sewer is twice its depth while discharging 1.5 m/sec. The width of the sewer is
Pick up the in-correct statement from the following :
Pick up the correct statement from the following :
The drop man holes are generally provided in sewers for
Nitrogen cycle of sewage, is
The recommended detention period for grit chambers is
Pick up the incorrect statement from the following :
A drop manhole is provided if
A drop manhole is provided if
Pick up the correct statement from the following :
Hydraulic mean radius is
The minimum recommended diameter of sewers, is
Pick up the correct statement from the following :
The most dangerous pollutant in vehicular emissions is
The detention period for plain sedimentation water tanks, is usually
In a city the ratio of the drainage to sewage isthe percentage discharge passing through non-monsoon periods, is
Aerobic bacterias
The liquid wastes from kitchens, bath rooms and wash basins, is not called
If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted toml for 5 days at 20°C, B.O.D. of the sewage is
The rate of accumulation of sludge in septic tanks is recommended as
The presence of free ammonia in sewage, is detected by
The clarigesters are
Ifsolution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is
The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known
Rate of flow of sewage is generally assumed
The detention period for plain sedimentation water tanks, is usually
If D is the diameter of upper circular portion, the overall depth of a standard egg shaped section, is
The standard B.O.D. of water is taken for
Maximum permissible velocity 1.5 m/sec, is adopted in drains
The rainfall at any place may be determined by
The maximum diameter of sewers adopted in the designs is
If the peak discharge of a storm water drain (S.W. Drain) is e.xpected to exceedcumecs, the free board to be provided, is
In trickling filter, B.O.D. is reduced to
Sluge banks are formed if sewage is disposed of in
PH value of sludge during alkaline regression stage, is
Which one of the following gases is most significant as air pollutant
If the diameter of a sewer ismm, the gradient required for generating self cleansing velocity, is
Lead caulked joints are used for laying
Design period oftoyears is adopted for
The sewer which received discharge from two or more main sewers, is known as
Depletion of ozone layer in the outer atmosphere may cause
The spacing of bars of perforations of fine screens used for the treatment of sewage, is