Q.1
For large sewers, maximum distance between manholes may be
Q.2
In sewage, the solids in mg per litre is
Q.3
For the COD test of sewage, organic matter is oxidised by K₂Cr₂O₇ in the presence of
Q.4
Pick up the correct statement from the following:
Q.5
An inverted siphon is designed generally for
Q.6
In sewers the gas generally found, is
Q.7
Kjeldahl nitrogen is a mixture of
Q.8
The intensity of rain is expressed in
Q.9
The ratio of maximum sewage flow to average sewage flow for mains up to 1 m in diameter, is
Q.10
The sewerage system originates from
Q.11
In a city the ratio of the drainage to sewage is 20, the percentage discharge passing through non-monsoon periods, is
Q.12
Pick up the correct statement from the following:
Q.13
Pick up the correct statement from the following:
Q.14
For house drainage minimum gradient is
Q.15
To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by potassium dichromate in the presence of
Q.16
Pathogens (or pathogenic bacterias) in water may cause
Q.17
The grit chambers of sewage treatment plants, are generally cleaned after
Q.18
Cement concrete sewers are only suitable if non-scouring velocity is between
Q.19
Pick up the correct statement from the following:
Q.20
Which one of the following resists hydrogen sulphide corrosion?
Q.21
The gas evolved in sewers is
Q.22
For sewers, inverted siphon is provided for
Q.23
The digested sludge from septic tanks, is removed after a maximum period of
Q.24
The underground sewers are more subjected to
Q.25
The formula which accepts the value of rugosity coefficient n = 0.012 to be used in Manning’s formula, is given by
Q.26
In SI units the power of sound is represented in
Q.27
Disposal to sewage in large cities, is done in
Q.28
In a sludge tank, the gas mainly produced, is
Q.29
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
Q.30
The gas which may cause explosion in sewers, is
Q.31
Pick up the correct statement from the following:
Q.32
In sewers the velocity of flow should not be
Q.33
The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is
Q.34
Pick up the correct statement from the following:
Q.35
‘Cowl’ is provided at
Q.36
The formula V = (1/n) r2/3
Q.37
A drop manhole is provided if
Q.38
A well oxidized sewage contains nitrogen mainly as
Q.39
The settlement of a particle in sedimentation tank, is affected by
Q.40
Skimming tanks are
Q.41
Sludge banks are formed if sewage is disposed of in
Q.42
The rate of accumulation of sludge in septic tanks is recommended as
Q.43
Pick up the correct statement from the following:
Q.44
The most widely used pump for lifting sewage is
Q.45
The non-clog pump which permits solid matter to pass out with the liquid sewage, is
Q.46
The arrangement made for passing the sewer line below an obstruction below the hydraulic gradient lines called
Q.47
No treatment of the sewage is given if dilution factor is
Q.48
For providing an Indian type W.C., the R.C.C. slabs in the toilet portion
Q.49
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
Q.50
In septic tanks,
0 h : 0 m : 1 s