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Quiz 4
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Q.1
Flocculated particles do not change their
Size
Shape
Weight
None of these
Q.2
The dimensions of a rectangular settling tank are: length 24 m, width 6 m and depth 3 m. If 2 hour detention period for tanks is recommended, the rate of flow of sewage per hour, is
204 cu.m
208 cu.m
212 cu.m
216 cu.m
Q.3
Bottom openings 15 cm × 15 cm in the standing baffle wall are provided
15 cm c/c
22.5 cm c/c
30 cm c/c
50 cm c/c
Q.4
If the grit in grit chambers is 4.5 million litres per day, its cleaning is done
Manually
Mechanically
Hydraulically
Electrically
Q.5
In R.C. sewer pipes, the percentage longitudinal reinforcement to the cross-sectional area of concrete is kept
10.0
5.0
2.0
0.25
Q.6
The most dangerous pollutant in vehicular emissions is
CO₂
SO₂
CO₂
O₂
Q.7
The moisture content of sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is
25 %
50 %
10 %
5 %
Q.8
The effluent of a septic tank is
Fit for discharge into any open drain
Foul and contains dissolved and suspended solids
As good as that from a complete treatment
None of these
Q.9
5 days-biochemical oxygen demand (BOD5) is taken at a temperature of
0°C
15°C
20°C
25°C
Q.10
Imhoff cone is used to determine
Settleable solids
Suspended solids
Dissolved solids
None of these
Q.11
The algae dies out in the zone of
Degradation
Active decomposition
Recovery
Cleaner water
Q.12
For detecting the nitrates in sewage, the colour may be developed by adding
Potassium permanganate
Sulphuric acid and napthamine
Phenol-di -sulphuric acid and potassium hydroxide
None of these
Q.13
Ventilating shafts are provided to a sewer line at every
100 m
150 m
200 m
300 m
Q.14
A manhole is classified as shallow if its depth is between
0.4 to 0.5 m
0.5 to 0.7 m
0.7 to 0.9 m
0.9 to 1.20 m
Q.15
The design period in years for pumping plants, is
1
2 to 3
3 to 5
5 to 10
Q.16
At the junction of sewers
Top of smaller sewer is kept lower
Top of larger sewer is kept lower
Tops of both the sewers are at the same level
None of these
Q.17
The most effective arrangement for diverting excess storm water into a natural drainage, is
Leaping weir
Overflow weir
Siphon spill way
None of these
Q.18
The bottom of the sewage inlet chamber of septic tanks, is provided an outward slope
1 in 5
1 in 10
1 in 15
1 in 20
Q.19
Drop manholes are the manholes
Without entry ladders
Without manhole covers
With depths more than 3.5 m
Having drains at different levels
Q.20
For laying a sewer line in a trench of 2 m width, an offset line is marked on the ground parallel to the given centre line at a distance of
100 cm
120 cm
140 cm
160 cm
Q.21
For detecting the nitrites in the sewage, the matching colour may be developed by adding
Potassium permanganate
Sulphuric acid and napthamine
Phenol-di -sulphuric acid potassium hydroxide
None of these
Q.22
The average temperature of sewage in India, is
10°C
15°C
20°C
25°C
Q.23
In a fully mechanised composting plant, involves
Mechanized receipt
Mechanized segregation
Mechanized pulverising of refuse
All of these
Q.24
For drainage pipes in buildings the test applied before putting them to use, is
Water test
Smoke test
Straightness test
All the above
Q.25
During purification process of sewage the gas given off, is
Carbon dioxide
Hydrogen
Ammonia
All the above
Q.26
Which of the following pumps in used to pump sewage solids with liquid sewage without clogging the pump is?
Centrifugal pump
Pneumatic ejector
Reciprocating pump
None of these
Q.27
The width of a rectangular sewer is twice its depth while discharging 1.5 m/sec. The width of the sewer is
0.68 m
0.88 m
1.36 m
1.76 m
Q.28
The water carried sewerage system removes
Domestic sewage
Industrial sewage
Storm sewage
All the above
Q.29
For the survival of fish in a river stream, the minimum dissolved oxygen is prescribed
3 ppm
4 ppm
5 ppm
10 ppm
Q.30
Antisyphonage pipe is fitted
At the end of septic tanks
On manholes
With a W.'trap
At the beginning of sewer line
Q.31
The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is
d² (0.011d + 0.785H)/Q
d (0.022d + 0.085H)/Q
d (0.785d + 0.011H)/Q
d (0.285d + 0.011H)/Q
Q.32
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
16 m
20 m
24 m
30 m
Q.33
If is the diameter of upper circular portion, the overall depth of a standard egg shaped section, is
1.15 D
1.25 D
1.5 D
1.75 D
Q.34
For a peak discharge of 0.0157 cumec, with a velocity of 0.9 m/sec, the diameter of the sewer main, is
10 cm
12 cm
15 cm
18 cm
Q.35
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
100 mg/l
200 mg/l
300 mg/l
400 mg/l
Q.36
1000 kg of sewage contains
0.112 kg in suspension
0.112 kg in solution
0.225 kg in solution
Both A and C of above
Q.37
Pick up the incorrect statement from the following:
Manholes are provided in sewer pipes at suitable intervals
Catch basins are generally provided in sewers for carrying drainage discharge
Inlets are generally provided in all sewers
None of these
Q.38
Pick up the correct statement from the following:
pH value indicates acidity and alkalinity of sewage
In acidic sewage, the pH value is less than 7
In alkaline sewage, the pH value is more than 7
All the above
Q.39
The most efficient cross section of sewers in a separate sewerage system is
Parabolic
Circular
Rectangular
New egged
Q.40
Rate of flow of sewage is generally assumed
More than the rate of water supply
Equal to the rate of water supply
Less than the rate of water supply
At 150 litres per capita
Q.41
House connections to the laterals is generally made by
R.C.C.
P.C.C.
Cast iron
Glazed stonewares
Q.42
The self-cleansing velocity of water flowing through pipe lines, is
2 metres/sec
1 metre/sec
0.5 metre/sec
0.25 metre/sec
Q.43
If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains
Hydrogen sulphide
Carbon dioxide
Methane
Oxygen
Q.44
If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains
Hydrogen sulphide
Carbon dioxide
Methane
Oxygen
Q.45
Sewer pipes need be checked for
Minimum flow
Maximum flow
Both A and B
None of these
Q.46
In the activated sludge process
Aeration is continued till stability
Aeration is done with an admixture of previously aerated sludge
Sludge is activated by constant stirring
Water is removed by centrifugal action
Q.47
Water content of sewage is about
90 %
95 %
99 %
99.9 %
Q.48
A circular sewer section is preferred to because
It is cheaper in construction
It provides maximum area for a given perimeter
It provides maximum hydraulic mean depth
All the above
Q.49
The most efficient cross-section of sewers in a combined sewerage system is
Parabolic
Circular
Rectangular
New egged
Q.50
The minimum diameter of a sewer is kept
10 cm
15 cm
20 cm
25 cm
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