The most efficient cross-section of sewers in a combined sewerage system is
The most efficient cross-section of sewers in a combined sewerage system is
In SI units the power of sound is represented in
In SI units the power of sound is represented in
For drainage pipes in buildings the test applied before putting them to use, is
For drainage pipes in buildings the test applied before putting them to use, is
House connections to the laterals is generally made by
House connections to the laterals is generally made by
The gas which may cause explosion in sewers, is
The gas which may cause explosion in sewers, is
The gas evolved in sewers is
The gas evolved in sewers is
Pick up the incorrect statement from the following:
Pick up the incorrect statement from the following:
Hazen’s formula VS = 418 (GS – Gw)d [(3T + 70)/100] is used for the settlement velocity of the particles of diameter
Hazen’s formula VS = 418 (GS – Gw)d [(3T + 70)/100] is used for the settlement velocity of the particles of diameter
The grit chambers of sewage treatment plants, are generally cleaned after
The grit chambers of sewage treatment plants, are generally cleaned after
A well oxidized sewage contains nitrogen mainly as
A well oxidized sewage contains nitrogen mainly as
A five day B.O.D. at 15°C of the sewage of a town is 100 kg/day. If the 5 day B.O.D. per head at 15°C for standard sewage is 0.1 kg/day, the population equivalent is
A five day B.O.D. at 15°C of the sewage of a town is 100 kg/day. If the 5 day B.O.D. per head at 15°C for standard sewage is 0.1 kg/day, the population equivalent is
If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains
If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains
For house drainage minimum gradient is
For house drainage minimum gradient is
To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by potassium dichromate in the presence of
To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by potassium dichromate in the presence of
The ratio of maximum sewage flow to average sewage flow for mains up to 1 m in diameter, is
The ratio of maximum sewage flow to average sewage flow for mains up to 1 m in diameter, is
The most efficient cross section of sewers in a separate sewerage system is
The most efficient cross section of sewers in a separate sewerage system is
The underground sewers are more subjected to
The underground sewers are more subjected to
The maximum diameter of sewers adopted in the designs is
The maximum diameter of sewers adopted in the designs is
In a sludge tank, the gas mainly produced, is
In a sludge tank, the gas mainly produced, is
The self-cleansing velocity of water flowing through pipe lines, is
The self-cleansing velocity of water flowing through pipe lines, is
The width of a rectangular sewer is twice its depth while discharging 1.5 m/sec. The width of the sewer 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 correct statement from the following:
Pick up the correct statement from the following:
Before discharging the foul sewage into rivers, it is generally treated by
Before discharging the foul sewage into rivers, it is generally treated by
The digested sludge from septic tanks, is removed after a maximum period of
The digested sludge from septic tanks, is removed after a maximum period of
The formula which accepts the value of rugosity coefficient n = 0.012 to be used in Manning’s formula, is given by
The formula which accepts the value of rugosity coefficient n = 0.012 to be used in Manning’s formula, is given by
The settlement of a particle in sedimentation tank, is affected by
The settlement of a particle in sedimentation tank, is affected by
In areas where rainy season is limited to a few months, the type of sewerage system recommended is
In areas where rainy season is limited to a few months, the type of sewerage system recommended is
For a grit chamber, if the recommended velocity of flow is 0.2 m/sec and detention period is 2 minutes, the length of the tank, is
For a grit chamber, if the recommended velocity of flow is 0.2 m/sec and detention period is 2 minutes, the length of the tank, is
For trunk and out-fall, the type of sewers generally used, is
For trunk and out-fall, the type of sewers generally used, is
The following is the physical characteristic of sewage
The following is the physical characteristic of sewage
Pick up the correct statement from the following:
Pick up the correct statement from the following:
Stone ware pipes are
Stone ware pipes are
For the COD test of sewage, organic matter is oxidised by K₂Cr₂O₇ in the presence of
For the COD test of sewage, organic matter is oxidised by K₂Cr₂O₇ in the presence of
For a peak discharge of 0.0157 cumec, with a velocity of 0.9 m/sec, the diameter of the sewer main, is
For a peak discharge of 0.0157 cumec, with a velocity of 0.9 m/sec, the diameter of the sewer main, is
Pick up the correct statement from the following:
Pick up the correct statement from the following:
The sewerage system originates from
The sewerage system originates from
In Chezy’s formula V = C rs for calculating the velocity of flow in circular sewer of diameter running full, the value of hydraulic mean radius is
In Chezy’s formula V = C rs for calculating the velocity of flow in circular sewer of diameter running full, the value of hydraulic mean radius is
In sewers the velocity of flow should not be
In sewers the velocity of flow should not be
In the activated sludge process
In the activated sludge process
In a fully mechanised composting plant, involves
In a fully mechanised composting plant, involves
No treatment of the sewage is given if dilution factor is
No treatment of the sewage is given if dilution factor is
The coagulant which is generally not used for treating the sewage, is
The coagulant which is generally not used for treating the sewage, is
If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains
If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains
Disposal to sewage in large cities, is done in
Disposal to sewage in large cities, is done in
Pick up the correct statement from the following:
Pick up the correct statement from the following:
The pressure exerted by
The pressure exerted by
The arrangement made for passing the sewer line below an obstruction below the hydraulic gradient lines called
The arrangement made for passing the sewer line below an obstruction below the hydraulic gradient lines called
The intensity of rain is expressed in
The intensity of rain is expressed in
Pick up the correct statement from the following:
Pick up the correct statement from the following:
For large sewers, maximum distance between manholes may be
For large sewers, maximum distance between manholes may be
In detritus tanks,
In detritus tanks,
Antisyphonage pipe is fitted
Antisyphonage pipe is fitted
The minimum diameter of a sewer is kept
The minimum diameter of a sewer is kept
Pick up the correct statement from the following:
Pick up the correct statement from the following:
The spacing of bars of perforations of fine screens used for the treatment of sewage, is
The spacing of bars of perforations of fine screens used for the treatment of sewage, is
For sewers, inverted siphon is provided for
For sewers, inverted siphon is provided for
Kjeldahl nitrogen is a mixture of
Kjeldahl nitrogen is a mixture of
Sewer ventilating columns are generally placed at
Sewer ventilating columns are generally placed at
If is the diameter of upper circular portion, the overall depth of a standard egg shaped section, is
If is the diameter of upper circular portion, the overall depth of a standard egg shaped section, is
If the flame of a miner's safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains
If the flame of a miner's safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains
¾th or ¼th extra space is left in sewer pipes at maximum discharge for
¾th or ¼th extra space is left in sewer pipes at maximum discharge for
For providing an Indian type W.C., the R.C.C. slabs in the toilet portion
For providing an Indian type W.C., the R.C.C. slabs in the toilet portion
In septic tanks,
In septic tanks,
With self cleansing velocity in sewers
With self cleansing velocity in sewers
Inter-distance between ventilation columns in a sewer line is kept
Inter-distance between ventilation columns in a sewer line is kept
The most widely used pump for lifting sewage is
The most widely used pump for lifting sewage is
3.0 ml of raw sewage is diluted to 300 ml. The D.O. concentration of the diluted sample at the beginning of the test was 8 mg/l. After 5 day-incubation at 20°C, the D.O. concentration was 5 mg/l. The BOD of raw sewerage is
3.0 ml of raw sewage is diluted to 300 ml. The D.O. concentration of the diluted sample at the beginning of the test was 8 mg/l. After 5 day-incubation at 20°C, the D.O. concentration was 5 mg/l. The BOD of raw sewerage is
Sewer pipes need be checked for
Sewer pipes need be checked for
In sewage, the solids in mg per litre is
In sewage, the solids in mg per litre is
Water content of sewage is about
Water content of sewage is about
Pick up the correct statement from the following:
Pick up the correct statement from the following:
The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is
The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is
Sludge banks are formed if sewage is disposed of in
Sludge banks are formed if sewage is disposed of in
The factor responsible for purification of sewage in river is
The factor responsible for purification of sewage in river is
Which one of the following resists hydrogen sulphide corrosion?
Which one of the following resists hydrogen sulphide corrosion?
Hydraulic mean radius is
Hydraulic mean radius is
The non-clog pump which permits solid matter to pass out with the liquid sewage, is
The non-clog pump which permits solid matter to pass out with the liquid sewage, is
A circular sewer section is preferred to because
A circular sewer section is preferred to because
In sewers the gas generally found, is
In sewers the gas generally found, is
The rate of accumulation of sludge in septic tanks is recommended as
The rate of accumulation of sludge in septic tanks is recommended as
The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is
The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is
Pick up the correct statement from the following:
Pick up the correct statement from the following:
A drop manhole is provided if
A drop manhole is provided if
During purification process of sewage the gas given off, is
During purification process of sewage the gas given off, is
An inverted siphon is designed generally for
An inverted siphon is designed generally for
The water carried sewerage system removes
The water carried sewerage system removes
The sewer which resists sulphide corrosion, is
The sewer which resists sulphide corrosion, is
Skimming tanks are
Skimming tanks are
Cement concrete sewers are only suitable if non-scouring velocity is between
Cement concrete sewers are only suitable if non-scouring velocity is between
Pathogens (or pathogenic bacterias) in water may cause
Pathogens (or pathogenic bacterias) in water may cause
For the survival of fish in a river stream, the minimum dissolved oxygen is prescribed
For the survival of fish in a river stream, the minimum dissolved oxygen is prescribed
‘Cowl’ is provided at
‘Cowl’ is provided at
The formula V = (1/n) r2/3
The formula V = (1/n) r2/3
Which one of the following part of human body withstands minimum radiation?
Which one of the following part of human body withstands minimum radiation?
Which of the following pumps in used to pump sewage solids with liquid sewage without clogging the pump is?
Which of the following pumps in used to pump sewage solids with liquid sewage without clogging the pump is?
Pick up the correct statement from the following:
Pick up the correct statement from the following:
Rate of flow of sewage is generally assumed
Rate of flow of sewage is generally assumed
The spacing of bars for perforations in coarse screens used for the treatment of sewage, is
The spacing of bars for perforations in coarse screens used for the treatment of sewage, is
1000 kg of sewage contains
1000 kg of sewage contains
The ratio of minimum hourly flow to the average flow of sewage is
The ratio of minimum hourly flow to the average flow of sewage is
