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Quiz 14
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Q.1
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.2
The clarigesters are
Circular septic tanks
Rectangular septic tanks
Circular Imhoff double tanks with bottom hoppers
Circular Imhoff double storey tanks without bottom hoppers
Q.3
The rainfall at any place may be determined by
Its intensity
Its direction
Its frequency
All the above
Q.4
Nitrogen cycle of sewage, is
Liberation of ammonia-formation of nitrites-formation of nitrates-liberation of nitrogen
Liberation of nitrogen-liberation of ammonia-formation of nitrites- formation of nitrates
Liberation of nitrogen-formation of nitrates-formation of nitrites-liberation of ammonia
Formation of nitrates-formation of nitrites-liberation of nitrates-liberation of nitrates
Q.5
Hydraulically equivalent, the relationship which holds good, is
D8/3 = 4 b8/3
D3/8 = 4 b3/8
D2/3 = 4 b2/3
D3/2 = 4 b3/2
Q.6
For design of sewers, percentage of sewage discharge is assumed
65 to 70%
70 to 75%
75 to 80%
85%
Q.7
If D is the diameter of a circular sewer and D’ is the top horizontal diameter of an equivalent egg shaped section, the relationship which holds good, is
D’ = 0.64 D
D’ = 0.74 D
D’ = 0.84 D
D’ = 0.94 D
Q.8
If D.O. concentration falls down to zero in any natural drainage, it indicates the zone of
Degradation
Active decomposition
Recovery
Cleaner water
Q.9
The drainage area of a town ishectares. Itsarea is hard pavement ( K = 0.85), thearea is unpaved streets (K = 0.and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas asminutes and using the formula Ps = 900/(t +the maximum run off is
0.10 cumec
0.12 cumec
0.15 cumec
0.20 cumec
Q.10
The sewer which transports the sewage to the point of treatment, is called
House sewer
Out-fall sewer
Branch sewer
Main sewer
Q.11
The standard B.O.D. of water is taken for
1 day
2 days
3 days
5 days
Q.12
To prevent settling down of sewage both at the bottom and on the sides of a large sewer, self-cleaning velocity recommended for Indian conditions, is
0.50 m/sec
0.60 m/sec
0.70 m/sec
0.75 m/sec
Q.13
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.14
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.15
Maximum permissible velocity 1.5 m/sec, is adopted in drains
With beds of rocks and gravels
Lined with stones
Both and
Neither nor
Q.16
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.17
If is the rugosity coefficient, is the bed slope of sewer, the velocity of flow in m/sec may be obtained by the formula V = (1/n) r2/3 s1/2 evolved by
Chezy
Manning
Bazin
Kutter
Q.18
The value of Chezy’s constant C = 157.6/(1.+ K/ ) is used in
Chezy’s formula
Bazin’s formula
Kutter’s formula
Manning’s formula
Q.19
In trickling filter, B.O.D. is reduced to
30 to 40%
40 to 60%
60 to 80%
80 to 90%
Q.20
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.21
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.22
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.23
The sewage treatment units in which anaerobic decomposition of organic matter is used, are called
Imhoff tanks
Trickling filters
Sludge sedimentation tanks
None of these
Q.24
The porosity of sediments in sewer pipes, is usually taken as
0.010
0.011
0.012
0.013
Q.25
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.26
A sewer pipe contains 1 mm sand particles of specific gravity 2.and 5 mm organic particles of specific gravity 1.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.27
The spacing of man holes along a straight portion of a sewer ism, the diameter of the sewer may be
0.9 cm
1.2 m
1.5 m
> 1.5 m
0 h : 0 m : 1 s
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