A safety lamp when inserted in the upper portion of a manhole causes flames. It indicates the presence of
A safety lamp when inserted in the upper portion of a manhole causes flames. It indicates the presence of
A rain sanitary sewer is constructed to carry
A rain sanitary sewer is constructed to carry
In a city the ratio of the drainage to sewage is 20, the percentage discharge passing through non-monsoon periods, is
In a city the ratio of the drainage to sewage is 20, the percentage discharge passing through non-monsoon periods, is
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
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
As compared to fresh river water, sea water contains oxygen
As compared to fresh river water, sea water contains oxygen
For evaporation and measurement of settable solids, the apparatus used, is
For evaporation and measurement of settable solids, the apparatus used, is
For treating the sewage of a large city, you will recommend
For treating the sewage of a large city, you will recommend
The normal values of over flow rates for secondary sedimentation tanks, ranges between
The normal values of over flow rates for secondary sedimentation tanks, ranges between
The sewerage system consists of
The sewerage system consists of
Pick up the incorrect statement from the following for allowing workers to enter sewers
Pick up the incorrect statement from the following for allowing workers to enter sewers
You are asked to design sewer pipes of diameters 0.4 m to 0.9 m at maximum flow, you will assume the sewer flow running at
You are asked to design sewer pipes of diameters 0.4 m to 0.9 m at maximum flow, you will assume the sewer flow running at
Imhoff cone is used to determine
Imhoff cone is used to determine
If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is
If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is
The algae dies out in the zone of
The algae dies out in the zone of
The normal values of over flow rates for sedimentation tanks using coagulant, ranges between
The normal values of over flow rates for sedimentation tanks using coagulant, ranges between
The sewage is pumped up
The sewage is pumped up
If the peak discharge of a storm water drain (S.W. Drain) is expected to exceed 150 cumecs, the free board to be provided, is
If the peak discharge of a storm water drain (S.W. Drain) is expected to exceed 150 cumecs, the free board to be provided, is
Aerobic activity is maximum
Aerobic activity is maximum
The small sewers are cleaned by
The small sewers are cleaned by
Primary treatment of sewage consists of removal of
Primary treatment of sewage consists of removal of
The density of population over 40 hectares is 250/hectare. If water supply demand per day is 200 litres and sewage discharge is 80% of water supply, the sewage flow in sewers of separate system, is
The density of population over 40 hectares is 250/hectare. If water supply demand per day is 200 litres and sewage discharge is 80% of water supply, the sewage flow in sewers of separate system, is
The sewer which collects the discharge from a collecting system and delivers it to a treatment plant, is known
The sewer which collects the discharge from a collecting system and delivers it to a treatment plant, is known
Fresh sewage is generally
Fresh sewage is generally
The detention time (t) of a settling tank, may be defined as the time required for
The detention time (t) of a settling tank, may be defined as the time required for
For design purposes, the normal rate of infiltration of ground water into the sewer, is
For design purposes, the normal rate of infiltration of ground water into the sewer, is
At the junction of sewers
At the junction of sewers
Pick up the correct statement from the following:
Pick up the correct statement from the following:
Self-cleansing velocity is
Self-cleansing velocity is
In sewers the highest non-scouring velocity is achieved in
In sewers the highest non-scouring velocity is achieved in
In sewers the effect of scouring is more on
In sewers the effect of scouring is more on
Depletion of ozone layer in the outer atmosphere may cause
Depletion of ozone layer in the outer atmosphere may cause
Pick up the incorrect statement from the following:
Pick up the incorrect statement from the following:
Setting out the alignments of sewers may start from
Setting out the alignments of sewers may start from
For detecting the nitrites in the sewage, the matching colour may be developed by adding
For detecting the nitrites in the sewage, the matching colour may be developed by adding
Fresh sewage may become stale in
Fresh sewage may become stale in
The asbestos cement pipes are generally laid
The asbestos cement pipes are generally laid
For detecting the nitrates in sewage, the colour may be developed by adding
For detecting the nitrates in sewage, the colour may be developed by adding
Pick up the incorrect statement from the following:
Pick up the incorrect statement from the following:
The settling velocity of a spherical particle of diameter less than 0.1 mm as per Stock’s law, is
The settling velocity of a spherical particle of diameter less than 0.1 mm as per Stock’s law, is
The gradient of sewers depends upon
The gradient of sewers depends upon
Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to
Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to
The ratio of design discharge to the surface area of a sedimentation tank is called
The ratio of design discharge to the surface area of a sedimentation tank is called
In circular sewers if depth of flow is 0.2 times the full depth, the nominal gradient,
In circular sewers if depth of flow is 0.2 times the full depth, the nominal gradient,
For estimating the peak run off the rational formula Q = 0.0278 KpA was evolved by
For estimating the peak run off the rational formula Q = 0.0278 KpA was evolved by
Which one of the following tests is used for testing sewer pipes?
Which one of the following tests is used for testing sewer pipes?
The minimum recommended diameter of sewers, is
The minimum recommended diameter of sewers, is
The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is
The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is
A sewer running partially full and hurried with back filled, fails in compression due to
A sewer running partially full and hurried with back filled, fails in compression due to
Pick up the correct statement from the following:
Pick up the correct statement from the following:
If is the diameter of upper circular portion, the overall depth of New Egg shaped sewer section, is
If is the diameter of upper circular portion, the overall depth of New Egg shaped sewer section, is
Imhoff cone is used to measure
Imhoff cone is used to measure
Sewer manholes are generally provided at
Sewer manholes are generally provided at
The moisture content of sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is
The moisture content of sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is
depends upon The Chezy’s constant C in the formula V = C
depends upon The Chezy’s constant C in the formula V = C
Pick up the correct statement from the following:
Pick up the correct statement from the following:
Chlorination of water is done for the removal of
Chlorination of water is done for the removal of
Pick up the correct statement from the following:
Pick up the correct statement from the following:
Pick up the correct statement from the following:
Pick up the correct statement from the following:
The design period in years for pumping plants, is
The design period in years for pumping plants, is
In sewage having fully oxidised organic matter, the nitrogen exists in the form of
In sewage having fully oxidised organic matter, the nitrogen exists in the form of
The grit and silt of the grit chambers, may not be used for
The grit and silt of the grit chambers, may not be used for
In case of sewer lines
In case of sewer lines
Pick up the correct statement from the following:
Pick up the correct statement from the following:
The liquid wastes from kitchens, bath rooms and wash basins, is not called
The liquid wastes from kitchens, bath rooms and wash basins, is not called
The sewage discharge in a detritus tank of a treatment plant is 576 litres/sec with flow velocity of 0.2 m/sec. If the ratio of width to depth is 2, the depth is
The sewage discharge in a detritus tank of a treatment plant is 576 litres/sec with flow velocity of 0.2 m/sec. If the ratio of width to depth is 2, the depth is
If the diameter of a sewer is 150 mm, the gradient required for generating self cleansing velocity, is
If the diameter of a sewer is 150 mm, the gradient required for generating self cleansing velocity, is
pH value of sludge during alkaline regression stage, is
pH value of sludge during alkaline regression stage, is
The average temperature of sewage in India, is
The average temperature of sewage in India, is
During preliminary treatment of a sewage
During preliminary treatment of a sewage
If q is the average sewage flow from a city of population P, the maximum sewage flow
If q is the average sewage flow from a city of population P, the maximum sewage flow
Pick up the incorrect statement from the following:
Pick up the incorrect statement from the following:
The sewer which received discharge from two or more main sewers, is known as
The sewer which received discharge from two or more main sewers, is known as
The screens are fixed
The screens are fixed
If the over land flow from the critical point to the drain is 8 km and the difference in level is 12.4 m, the inlet time is
If the over land flow from the critical point to the drain is 8 km and the difference in level is 12.4 m, the inlet time is
The rate of accumulation of sludge per person per year, is
The rate of accumulation of sludge per person per year, is
Pick up the incorrect size of stone ware sewers
Pick up the incorrect size of stone ware sewers
The settlement velocity of a solid (diameter 0.5 mm, specific gravity 1.75) in water having temperature 10°C, is
The settlement velocity of a solid (diameter 0.5 mm, specific gravity 1.75) in water having temperature 10°C, is
The stone ware sewers
The stone ware sewers
In olden days the type of section adopted in trunk and out fall sewers was
In olden days the type of section adopted in trunk and out fall sewers was
The maximum depth of sedimentation tanks, is kept
The maximum depth of sedimentation tanks, is kept
The detention period for plain sedimentation water tanks, is usually
The detention period for plain sedimentation water tanks, is usually
If the pH value of sewage is 7
If the pH value of sewage is 7
Lead acetate test in sewer manhole is done to test the presence of
Lead acetate test in sewer manhole is done to test the presence of
Pick up the correct statement from the following:
Pick up the correct statement from the following:
The most effective arrangement for diverting excess storm water into a natural drainage, is
The most effective arrangement for diverting excess storm water into a natural drainage, is
If the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is
If the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is
Bottom openings 15 cm × 15 cm in the standing baffle wall are provided
Bottom openings 15 cm × 15 cm in the standing baffle wall are provided
Boussinesq’s equation for ascertaining unit pressure at a depth on sewers due to traffic loads, is
Boussinesq’s equation for ascertaining unit pressure at a depth on sewers due to traffic loads, is
If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity is
If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity is
The pH value of fresh sewage is usually
The pH value of fresh sewage is usually
For efficient working of a sewer, it must be ensured that
For efficient working of a sewer, it must be ensured that
The laying of sewers is done with
The laying of sewers is done with
The angle subtended by the surface of sewer water with partial flow, at sewer centre is 120°, the depth of sewerage is
The angle subtended by the surface of sewer water with partial flow, at sewer centre is 120°, the depth of sewerage is
The sewer pipes
The sewer pipes
In 1000 kg of sewage, the total solids approximate
In 1000 kg of sewage, the total solids approximate
Ventilating shafts are provided to a sewer line at every
Ventilating shafts are provided to a sewer line at every
The most dangerous pollutant in vehicular emissions is
The most dangerous pollutant in vehicular emissions is
Dry water flow in a combined sewer, is
Dry water flow in a combined sewer, is
Design period of 40 to 50 years is adopted for
Design period of 40 to 50 years is adopted for
When drainage to sewage ratio is 20, the peak dry weather flow is
When drainage to sewage ratio is 20, the peak dry weather flow is
To maintain aerobic biological activity, the moisture content of the compost mass should be about
To maintain aerobic biological activity, the moisture content of the compost mass should be about
In septic tanks, decomposition of organic bacteria, is done by
In septic tanks, decomposition of organic bacteria, is done by
The normal value of over flow rates for plain primary sedimentation tanks, ranges between
The normal value of over flow rates for plain primary sedimentation tanks, ranges between
