Pick up the correct statement from the following:
Pick up the correct statement from the following:
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 minimum diameter of a sewer is kept
The minimum diameter of a sewer is kept
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
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:
Pick up the incorrect statement from the following:
Pick up the incorrect statement from the following:
‘Cowl’ is provided at
‘Cowl’ is provided at
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
The factor responsible for purification of sewage in river is
The factor responsible for purification of sewage in river 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
Hydraulic mean radius is
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 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
The maximum diameter of sewers adopted in the designs is
The maximum diameter of sewers adopted in the designs is
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
The grit chambers of sewage treatment plants, are generally cleaned after
The grit chambers of sewage treatment plants, are generally cleaned after
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
Sewer ventilating columns are generally placed at
Sewer ventilating columns are generally placed at
The sewer which resists sulphide corrosion, is
The sewer which resists sulphide corrosion, 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 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
Antisyphonage pipe is fitted
Antisyphonage pipe is fitted
Sewer pipes need be checked for
Sewer pipes need be checked for
In sewers the velocity of flow should not be
In sewers the velocity of flow should not be
Rate of flow of sewage is generally assumed
Rate of flow of sewage is generally assumed
Cement concrete sewers are only suitable if non-scouring velocity is between
Cement concrete sewers are only suitable if non-scouring velocity is between
Before discharging the foul sewage into rivers, it is generally treated by
Before discharging the foul sewage into rivers, it is generally treated by
Water content of sewage is about
Water content of sewage is about
Which one of the following resists hydrogen sulphide corrosion?
Which one of the following resists hydrogen sulphide corrosion?
In detritus tanks,
In detritus tanks,
House connections to the laterals is generally made by
House connections to the laterals is generally made by
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
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 intensity of rain is expressed in
The intensity of rain is expressed in
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
Pick up the correct statement from the following:
Pick up the correct statement from the following:
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
For large sewers, maximum distance between manholes may be
For large sewers, maximum distance between manholes may be
In a fully mechanised composting plant, involves
In a fully mechanised composting plant, involves
A circular sewer section is preferred to because
A circular sewer section is preferred to because
Inter-distance between ventilation columns in a sewer line is kept
Inter-distance between ventilation columns in a sewer line is kept
Pick up the correct statement from the following:
Pick up the correct statement from the following:
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 a sludge tank, the gas mainly produced, is
In a sludge tank, the gas mainly produced, is
Kjeldahl nitrogen is a mixture of
Kjeldahl nitrogen is a mixture of
With self cleansing velocity in sewers
With self cleansing velocity in sewers
In sewers the gas generally found, is
In sewers the gas generally found, is
The settlement of a particle in sedimentation tank, is affected by
The settlement of a particle in sedimentation tank, is affected by
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
Skimming tanks are
Skimming tanks are
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 sewers, inverted siphon is provided for
For sewers, inverted siphon is provided for
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 correct statement from the following:
Pick up the correct statement from the following:
During purification process of sewage the gas given off, is
During purification process of sewage the gas given off, is
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?
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
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
For house drainage minimum gradient is
For house drainage minimum gradient is
Disposal to sewage in large cities, is done in
Disposal to sewage in large cities, is done in
Stone ware pipes are
Stone ware pipes are
The pressure exerted by
The pressure exerted by
In sewage, the solids in mg per litre is
In sewage, the solids in mg per litre is
A well oxidized sewage contains nitrogen mainly as
A well oxidized sewage contains nitrogen mainly as
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
1000 kg of sewage contains
1000 kg of sewage contains
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 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
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
The gas which may cause explosion in sewers, is
The gas which may cause explosion in sewers, is
Pick up the correct statement from the following:
Pick up the correct statement from the following:
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 sewerage system originates from
The sewerage system originates from
The water carried sewerage system removes
The water carried sewerage system removes
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
An inverted siphon is designed generally for
An inverted siphon is designed generally for
The gas evolved in sewers is
The gas evolved in sewers is
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 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 formula V = (1/n) r2/3
The formula V = (1/n) r2/3
The underground sewers are more subjected to
The underground sewers are more subjected to
In septic tanks,
In septic tanks,
Pathogens (or pathogenic bacterias) in water may cause
Pathogens (or pathogenic bacterias) in water may cause
In SI units the power of sound is represented in
In SI units the power of sound is represented in
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 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
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
In the activated sludge process
In the activated sludge process
A drop manhole is provided if
A drop manhole is provided if
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
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
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
The self-cleansing velocity of water flowing through pipe lines, is
The self-cleansing velocity of water flowing through pipe lines, is
Sludge banks are formed if sewage is disposed of in
Sludge banks are formed if sewage is disposed of in
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 most widely used pump for lifting sewage is
The most widely used pump for lifting sewage is
