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Q.1
In a sedimentation tank (length L, width B, depth D) the settling velocity of a particle for a discharge Q, is
Q
/
(B × D)
Q
/
(L × D)
Q
/
L
Q
/
(B × L)
Q.2
The sludge does not contain waste water from
Bath rooms
Wash basins
Kitchen sinks
Toilets
Q.3
Dry weather flow is:
Average daily rate of flow
Average monthly rate of flow
Average annual rate of flow
Water supply allowance per capita
Q.4
Drop manholes at the junctions of sewer lines, are provided if
Invert level of a branch sewer is more than 60 cm that of the main sewer
Sewer line runs along a main road
Ordinary manhole cannot be built
Two sewer lines intersect
Q.5
It is customary to design a sewer for D.W.F. on the basis of
Average demand
Twice the average demand
Thrice the average demand
Four times the average demand
Q.6
Maximum permissible velocity 1.5 m/sec, is adopted in drains
With beds of rocks and gravels
Lined with stones
Both A. and B.
Neither A. nor B.
Q.7
Aerobic bacterias
Flourish in the presence of free oxygen
Consume organic matter as their food
Oxidise organic matter in sewage
All the above
Q.8
The quantity of liquid waste which flows in sewers during the period of rainfall, is known
Sanitary sewage
Industrial waste
Storm sewage
None of these
Q.9
The pH value of sewage is determined with the help of
Imhoff Cone
Turbid meter
Potentiometer
None of these
Q.10
In trickling filter, B.O.D. is reduced to
30 to 40%
40 to 60%
60 to 80%
80 to 90%
Q.11
The value of Chezy’s constant C = 157.6/(1.81 + K/ ) is used in
Chezy’s formula
Bazin’s formula
Kutter’s formula
Manning’s formula
Q.12
The maximum spacing of manholes specified by Indian standard in sewers upto 0.3 m diameter is
20 m
30 m
45 m
75 m
Q.13
Dry water flow in a combined sewer, is
Industrial sewage
Domestic sewage
Storm water
Inclusive of domestic and industrial sewage but excludes storm water
Q.14
A sewer running partially full and hurried with back filled, fails in compression due to
Weight of the pipe
Weight of the back fill
Superimposed traffic loads
All the above
Q.15
The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known
Bio-Chemical Oxygen Demand (B.O.D.)
Dissolved Oxygen (D.O.)
Chemical Oxygen Demand (C.O.D.)
None of these
Q.16
Removal of oil and grease from sewage, is known
Screening
Skimming
Filtration
None of these
Q.17
If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is
50 ppm
100 ppm
150 ppm
200 ppm
Q.18
If the discharge of a sewer running half is 628 1.p.s., i = 0.001, and n = 0.010, the diameter of the sewer, is
1.39 m
1.49 m
1.59 m
1.69 m
Q.19
Acid regression stage of sludge digestion at a temperature 21°C extends over a period of
15 days
30 days
60 days
90 days
Q.20
The ratio of design discharge to the surface area of a sedimentation tank is called
Surface loading
Overflow rate
Overflow velocity
All of these
Q.21
The maximum depth of sedimentation tanks, is kept
3 m
3.5 m
4 m
4.5 m
Q.22
Are available in size Stoneware sewers
10 cm
15 cm
20 cm
All the above
Q.23
Oxidation process results in the formation of
Carbon dioxide
Nitrates
Sulphates
All the above
Q.24
The spacing of man holes along a straight portion of a sewer is 300 m, the diameter of the sewer may be
0.9 cm
1.2 m
1.5 m
> 1.5 m
Q.25
For non-scouring velocity 5 m/sec, the type of sewers generally preferred to, is
Cast iron sewers
Cement concrete sewers
Glazed bricks sewers
Stone ware sewers
Q.26
A manhole is generally provided at each
Bend
Junction
Change of gradient
All the above
Q.27
A sewer pipe contains 1 mm sand particles of specific gravity 2.65 and 5 mm organic particles of specific gravity 1.2, the minimum velocity required for removing the sewerage, is
0.30 m/sec
0.35 m/sec
0.40 m/sec
0.45 m/sec
Q.28
Dilution method of disposing of sewage, is not preferred to
When sewage is fresh
When diluting water has high dissolved oxygen content
When diluting water is used for water supply near the point of sewage disposed
When the diluting water is having flow currents
Q.29
In case of Imhoff tanks,
The shape is rectangular
Detention period is 2 hours
The velocity of flow is restricted to 0.30 m/minute
All the above
Q.30
Chlorination of water is done for the removal of
Bacterias
Suspended solids
Sediments
Hardness
Q.31
In a sludge digestion tank if the moisture content of sludge V1 litres is reduced from p1 % to p2 % the volume V2 is
[(100 + P1)/(100 – P2)] V1
[(100 – P1)/(100 + P2)] V1
[(100 – P1)/(100 – P2)] V1
[(100 + P2)/(100 – P1)] V1
Q.32
The minimum diameter of sewer to be adopted is
10 cm
12.5 cm
15 cm
25 cm
Q.33
In a grit chamber of a sewage treatment plant,
Flow velocity 0.15 m to 0.3 m/sec is kept
Depth of 0.9 m to 1.20 m is kept
One minute of detention period is kept
All the above
Q.34
Clogging of sewers, is caused due to
Silting
Low discharge
Greasy and oily matters
All the above
Q.35
A rainfall may be classified as acidic if its pH value is less or equal to
6
7
5
6.5
Q.36
If a 2% solution of sewage sample is incubated for 5 days at 20°C and the dissolved oxygen depletion was found to be 8 mg/l. The BOD of the sewage is
100 mg/l
200 mg/l
300 mg/l
400 mg/l
Q.37
If 2% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is
200 ppm
225 ppm
250 ppm
None of these
Q.38
If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20°C, B.O.D. of the sewage is
50 mg/l
100 mg/l
150 mg/l
250 mg/l
Q.39
R.M.O. expenses include
Running expenses
Maintenance expenses
Operation expenses
All the above
Q.40
15 cumecs, the depth d and width are related by For drains up to
d = 0.2 B
d = 0.5 B
B = 0.2 d
B = 0.5 d
Q.41
In a trickling filter
Filtration process is used
Biological action is used
Neither A nor B
Both A and B
Q.42
In very first stage of decomposition of the organic matter in sewage
Nitrites are formed
Nitrates are formed
Carbondioxide is formed
Ammonia is formed
Q.43
The layers of vegetable wastes and night soil alternatively piled above the ground to form a mound, is called
A heap
Plateau
Windrow
None of these
Q.44
The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is
30 minutes
1 hour
1 hour and 30 minutes
2 hours
Q.45
The discharge per unit plan area of a sedimentation tank, is generally called
Over flow rate
Surface loading
Over flow velocity
All the above
Q.46
The recommended detention period for grit chambers is
1 minute
2 minutes
3 minutes
5 minutes
Q.47
Fresh sewage is generally
Alkaline
Acidic
Highly decomposed
A source of objectionable odour
Q.48
The sewage is pumped up
From low lying areas
From flat areas
From basements
All the above
Q.49
The rainfall at any place may be determined by
Its intensity
Its direction
Its frequency
All the above
Q.50
The clarigesters are
Circular septic tanks
Rectangular septic tanks
Circular Imhoff double tanks with bottom hoppers
Circular Imhoff double storey tanks without bottom hoppers
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