B. 4 ppm of Dissolved Oxygen (D.O.) is ensured before discharging the treated sewage in river
C. Hydrogen sulphide gas in excess, may cause corrosion of concrete sewers
D. Solubility of oxygen in sewage is 95% of that of distilled water
A. Average daily rate of flow
C. Average monthly rate of flow
D. Average annual rate of flow
A. None of these
C. Pneumatic ejector
D. Reciprocating pump
A. Water test
B. Straightness test
D. All the above
A. Pressure sewers are designed to be safe in tension
C. The internal pressure if any, causes tensile stress in the pipe material
D. The sewage when running full from inside, is called internal pressure
A. 30 days
C. 60 days
D. 15 days
A. Mean of radii in a pipe line of varying cross -sections
B. Mean radius of sewer
C. Difference in heads between two points in circular pipes
A. Susceptible to corrosion by sulphuric acid
B. Not structurally strong to bear large compressive stress
C. Light in weight
A. Length of the tank is normally kept 4 to 5 times the width
B. Width of the tank is normally kept about 6 m
C. Maximum horizontal flow velocity is limited to 0.3 m/minute
A. Sedimentation tanks with high rate trickling filters
B. A plant consisting of Imhoff tanks with low rate trickling filters
C. None of these
B. A main sewer
C. An intercepting sewer
D. An outfall sewer
A. 0.10 cumec
B. 0.12 cumec
D. 0.20 cumec
A. Running expenses
B. Maintenance expenses
D. Operation expenses
B. Less than 150
C. Between 200 to 300
D. Between 150 to 200
A. Unexpected increase in population
B. Low estimates of the average and maximum flows
C. Large scale infiltration of storm water
A. Fruhling
B. Kuichling
D. Lloyd David
A. Its intensity
C. Its direction
D. Its frequency
A. Ferric chloride
B. Ferric sulphate
C. Chlorinated copperas
B. 15 cm c/c
C. 50 cm c/c
D. 30 cm c/c
B. Hydrogen sulphide
C. Carbon dioxide
D. Oxygen
A. Shape of the sewer
B. Roughness of sewer surface
C. Size of the sewer
A. Rate of digestion of sludge is more at higher temperature
B. Thermophilic organisms digest the sludge if the temperature ranges from 40 to 60C
C. Mesophilic organisms digest the sludge if the temperature is between 25 and 40C
A. Dissolve the foul gases
B. Create symphonic action to increase the quick disposal of sewerage
C. Are used to trap the rats entering sewers
A. 0.112 kg in suspension
B. 0.112 kg in solution
C. 0.225 kg in solution
A. Minimum velocity of 0.45 m/sec, is maintained at its minimum flow
B. A maximum velocity of 0.90 m/sec, is maintained at its maximum flow
D. Neither A. nor B.
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true
A. Consume organic matter as their food
B. Oxidise organic matter in sewage
D. Flourish in the presence of free oxygen
B. 29.88 cumecs
C. 26.88 cumecs
D. 27.88 cumecs
B. The sewer pipes of sizes greater than 0.4 m diameter are designed as running 2/3rd or 3/4th full at maximum discharge
C. The minimum design velocity of sewer pipes is taken as 0.8 m/sec
D. The sewer pipes of sizes less than 0.4 m diameter are designed as running full at maximum discharge
A. Wash basins
B. Bath rooms
D. Kitchen sinks
A. 0.01
B. 0.011
D. 0.012
B. Potassium permanganate
D. Sulphuric acid and napthamine
B. 1 in 80
C. 1 in 10
D. 1 in 400
A. B = 0.5 d
B. d = 0.2 B
C. B = 0.2 d
B. 0.05554 cumec
C. 0.0556 cumec
D. 0.05552 cumec
A. 40 to 60%
B. 30 to 40%
D. 80 to 90%
A. Ferric sulphate
D. Alum
A. 25 litres/person/year
B. 30 litres/person/month
D. 25 litres/person/month
A. 4.0 m
B. 2.0 m
C. 1.0 m
B. 140 cm
C. 100 cm
D. 120 cm
B. Screening
C. Sedimentation
D. Oxidation
A. One pipe
C. Two pipes
D. Four pipes
A. 1 in 100
B. 1 in 60
A. 0.05 m/sec
D. 1.25 m/sec
B. 1.5
C. 4
D. 3
A. A test tube
B. A breaker
C. A jar
B. Are designed for generating self-cleansing velocities at different discharge
C. Carry sewage as gravity conduits
D. Should resist the wear and tear caused due to abrasion
B. Overflow weir
C. Leaping weir
A. Screening
B. None of these
C. Filtration
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