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
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
The sewerage system originates from
The sewerage system originates from
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 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
The intensity of rain is expressed in
The intensity of rain is expressed in
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
Inter-distance between ventilation columns in a sewer line is kept
Inter-distance between ventilation columns in a sewer line is kept
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
The grit chambers of sewage treatment plants, are generally cleaned after
The grit chambers of sewage treatment plants, are generally cleaned after
During purification process of sewage the gas given off, is
During purification process of sewage the gas given off, is
In detritus tanks,
In detritus tanks,
Cement concrete sewers are only suitable if non-scouring velocity is between
Cement concrete sewers are only suitable if non-scouring velocity is between
Sewer ventilating columns are generally placed at
Sewer ventilating columns are generally placed at
In sewers the gas generally found, is
In sewers the gas generally found, is
In sewage, the solids in mg per litre is
In sewage, the solids in mg per litre is
For large sewers, maximum distance between manholes may be
For large sewers, maximum distance between manholes may be
Stone ware pipes are
Stone ware pipes are
No treatment of the sewage is given if dilution factor is
No treatment of the sewage is given if dilution factor is
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
The rate of accumulation of sludge in septic tanks is recommended as
The rate of accumulation of sludge in septic tanks is recommended as
Pick up the incorrect statement from the following:
Pick up the incorrect statement from the following:
The coagulant which is generally not used for treating the sewage, is
The coagulant which is generally not used for treating the sewage, is
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
Sewer pipes need be checked for
Sewer pipes need be checked for
The underground sewers are more subjected to
The underground sewers are more subjected to
House connections to the laterals is generally made by
House connections to the laterals is generally made by
Pick up the correct statement from the following:
Pick up the correct statement from the following:
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
Which one of the following resists hydrogen sulphide corrosion?
Which one of the following resists hydrogen sulphide corrosion?
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
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
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 pressure exerted by
The pressure exerted by
A drop manhole is provided if
A drop manhole is provided if
Pick up the correct statement from the following:
Pick up the correct statement from the following:
Hydraulic mean radius is
Hydraulic mean radius is
The settlement of a particle in sedimentation tank, is affected by
The settlement of a particle in sedimentation tank, is affected by
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
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 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
For house drainage minimum gradient is
For house drainage minimum gradient is
Pick up the correct statement from the following:
Pick up the correct statement from the following:
With self cleansing velocity in sewers
With self cleansing velocity in sewers
The factor responsible for purification of sewage in river is
The factor responsible for purification of sewage in river is
The gas evolved in sewers is
The gas evolved in sewers 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 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
Water content of sewage is about
Water content of sewage is about
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
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
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
The gas which may cause explosion in sewers, is
The gas which may cause explosion in sewers, is
Antisyphonage pipe is fitted
Antisyphonage pipe is fitted
In SI units the power of sound is represented in
In SI units the power of sound is represented in
Kjeldahl nitrogen is a mixture of
Kjeldahl nitrogen is a mixture of
Which one of the following part of human body withstands minimum radiation?
Which one of the following part of human body withstands minimum radiation?
The minimum diameter of a sewer is kept
The minimum diameter of a sewer is kept
Sludge banks are formed if sewage is disposed of in
Sludge banks are formed if sewage is disposed of in
In a fully mechanised composting plant, involves
In a fully mechanised composting plant, involves
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
A circular sewer section is preferred to because
A circular sewer section is preferred to because
A well oxidized sewage contains nitrogen mainly as
A well oxidized sewage contains nitrogen mainly as
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
The maximum diameter of sewers adopted in the designs is
The maximum diameter of sewers adopted in the designs is
In the activated sludge process
In the activated sludge process
The following is the physical characteristic of sewage
The following is the physical characteristic of sewage
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
Pathogens (or pathogenic bacterias) in water may cause
Pathogens (or pathogenic bacterias) in water may cause
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
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:
In a sludge tank, the gas mainly produced, is
In a sludge tank, the gas mainly produced, is
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 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
The sewer which resists sulphide corrosion, is
The sewer which resists sulphide corrosion, 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 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
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
Pick up the correct statement from the following:
Pick up the correct statement from the following:
Disposal to sewage in large cities, is done in
Disposal to sewage in large cities, is done in
In septic tanks,
In septic tanks,
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?
The formula V = (1/n) r2/3
The formula V = (1/n) r2/3
An inverted siphon is designed generally for
An inverted siphon is designed generally for
1000 kg of sewage contains
1000 kg of sewage contains
For sewers, inverted siphon is provided for
For sewers, inverted siphon is provided for
Before discharging the foul sewage into rivers, it is generally treated by
Before discharging the foul sewage into rivers, it is generally treated by
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
The self-cleansing velocity of water flowing through pipe lines, is
The self-cleansing velocity of water flowing through pipe lines, is
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
The most widely used pump for lifting sewage is
The most widely used pump for lifting sewage 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 water carried sewerage system removes
The water carried sewerage system removes
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
In sewers the velocity of flow should not be
In sewers the velocity of flow should not be
‘Cowl’ is provided at
‘Cowl’ is provided at
Pick up the correct statement from the following:
Pick up the correct statement from the following:
Skimming tanks are
Skimming tanks are
