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Quiz 5
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Q.1
Inter-distance between ventilation columns in a sewer line is kept
25 to 50 m
50 m to 100 m
100 m to 150 m
150 m to 300 m
Q.2
With self cleansing velocity in sewers
Silting occurs at bottom
Scouring occurs at bottom
Both silting and scouring occur at bottom
Neither silting nor scouring occurs at bottom
Q.3
In areas where rainy season is limited to a few months, the type of sewerage system recommended is
Combined system
Partially separate system
Separate system
None of these
Q.4
For trunk and out-fall, the type of sewers generally used, is
Standard egg shaped
Circular shaped
Horse shoe shaped
Parabolic shaped
Q.5
The ratio of minimum hourly flow to the average flow of sewage is
1/4
1/3
1/2
3/4
Q.6
For sewer mains of 0.5 to 1 m diameter, the ratio of maximum daily sewage flow to the average daily sewage flow is assumed
1.5
2.0
2.5
3.0
Q.7
Pick up the correct statement from the following:
Indore method of composting involves decomposition under aerobic conditions
Bangalore method of composting involves decomposing under anaerobic conditions
Fully stabilised refuse by the Bangalore method of compositing is a powdery mass called humus
all of these
Q.8
In sewers designed with self cleansing velocity,
The bottom is silted
The bottom is scoured
Both silting and scouring occur at the bottom
Neither silting nor scouring occurs at the bottom
Q.9
The spacing of bars of perforations of fine screens used for the treatment of sewage, is
2 to 3 mm
3 to 5 mm
5 to 8 mm
8 to 10 mm
Q.10
The spacing of bars for perforations in coarse screens used for the treatment of sewage, is
20 mm
30 mm
40 mm
50 mm
Q.11
The sewer pipe which carries sewage from a building for immediate disposal is
House sewer
Lateral sewer
Intercepting sewer
Main sewer
Q.12
The ratio of maximum sewage flow to average sewage flow for trunk mains having diameters more than 1.25 m, is
1.5
2.0
3.0
4.0
Q.13
Lead caulked joints are used for laying
Stone ware pipes
Earthenware pipes
C.I. pipes
G.I. pipes
Q.14
Pick up the correct statement from the following:
Inlets are provided on the road surface at the lowest point for draining rain water
Inlets are generally provided at an interval of 30 m to 60 m along straight roads
Inlets having horizontal openings, are called horizontal inlets
All the above
Q.15
The disintegrating pump in which solid matter is broken up before passing out, is
Centrifugal pump
Reciprocating pump
Pneumatic ejector
None of these
Q.16
Hume steel pipes are
Steel pipes
Steel shell coated from inside with cement mortar
Steel shell coated from outside with cement mortar
Both B and C
Q.17
The sewer that unloads the sewage at the point of treatment is called
Main sewer
Outfall sewer
Branch sewer
House sewer
Q.18
In primary sedimentation, the 0.2 mm inorganic solids get separated if specific gravity is
2.25
2.50
2.55
2.65
Q.19
Sewer pipes are designed for maximum discharge with 25% to 33% vacant cross-sectional area for
Unexpected large scale infiltration of stream water
Unexpected increase in the population
Under estimates of maximum and average flows
All of the above
Q.20
Before discharging the foul sewage into rivers, it is generally treated by
Screening
Sedimentation
Oxidation
All the above
Q.21
The following is the physical characteristic of sewage
Turbidity
Colour
Odour
All the above
Q.22
If the flame of a miner's safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains
Hydrogen sulphide
Carbon dioxide
Methane
Oxygen
Q.23
If the side of a square sewer is 1000 mm, the diameter of a hydraulically equivalent circular section, is
1045 mm
1065 mm
1075 mm
1095 mm
Q.24
The drop man holes are generally provided in sewers for
Industrial areas
Large town ships
Hilly town ships
Cities in plains
Q.25
For a continuous flow type of sedimentation tanks
Width of the tank is normally kept about 6 m
Length of the tank is normally kept 4 to 5 times the width
Maximum horizontal flow velocity is limited to 0.3 m/minute
All the above
Q.26
The use of coarse screens for the disposal of sewage, may be dispensed with by
Comminutor
Shredder
Both A and B
Neither A nor B
Q.27
Large diameter sewers subjected to external pressure alone, are reinforced
Near the inner surface of the pipe
Near the outer surface of the pipe
Both A and B
With elliptical cage
Q.28
The presence of free ammonia in sewage, is detected by
Boiling
Adding potassium permanganate
Adding sulphuric acid
Phenol-di-sulphuric acid
Q.29
In circular sewers if depth of flow is 0.2 times the full depth, the nominal gradient,
Is only provided
Is doubled
Is trebled
Is not enough
Q.30
A cylindrical ejector having its height 2 m fills after every 10 minutes with a peak sewage discharge of 0.0157 cumec. The diameter of the ejector chamber, is
2.30 m
2.40 m
2.45 m
2.50 m
Q.31
The flow velocity in detritus tanks is
0.05 m/sec
0.09 m/sec
1.25 m/sec
None of these
Q.32
In normal conditions, the period for sludge digestion, is
10 days
20 days
30 days
60 days
Q.33
In a residential colony, sewers of diameters 100 mm, 150 mm and 225 mm were laid with a gradient 1 in 120. Which portion of the sewage system does not choke in due course of time?
100 mm dia
150 mm dia
225 mm dia
All of these
Q.34
For trunk sewers more than 1.25 m in diameter, the ratio of the maximum daily sewage flow to the average daily sewage flow is assumed
1.5
2.0
2.5
3.0
Q.35
The rational formula for peak drainage discharge, was evolved by
Fruhling
Lloyd David
Kuichling
All of these
Q.36
Discrete or granular particles change their
Size
Shape
Weight
None of these
Q.37
The suitable cross-section of sewers to carry combined flow, is
Circular
Egg shaped
Rectangular
Horse shoe shaped
Q.38
Stone ware pipes are
Highly resistant to sulphide corrosion
Highly impervious
Hydraulically efficient because of their smooth interior surface
Especially suited to pressure pipes
Q.39
Pick up the correct statement from the following:
The ratio of the quantity of the diluting water to that of the sewage, is known as dilution factor
The automatic purification of polluted water, is known self purification phenomenon
The photosynthesis is carried out in the presence of sun light
All the above
Q.40
¾th or ¼th extra space is left in sewer pipes at maximum discharge for
Low estimates of the average and maximum flows
Large scale infiltration of storm water
Unexpected increase in population
All the above
Q.41
In detritus tanks,
Flow velocity is kept 0.09 m/sec
Detention period is kept 3 to 4 minutes
Organic and inorganic materials are separated
All the above
Q.42
The liquid wastes from kitchens, bath rooms and wash basins, is not called
Liquid waste
Sullage
Sewage
None of these
Q.43
If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity is
1 in 60
1 in 100
1 in 120
None of these
Q.44
Self-cleansing velocity is
Velocity at dry weather flow
Velocity of water at flushing
Velocity at which no accumulation remains in the drains
Velocity of water in a pressure filter
Q.45
The first stage of neutral process of sludge digestion, is
Acid fermentation
Acid regression
Alkaline fermentation
None of these
Q.46
Facultative bacteria survive in
The presence of oxygen
The absence of oxygen
Both cases A and B
Neither A nor B
Q.47
A nuisance is experienced in diluting water if dilution factor is less than
100
60
40
20
Q.48
The width of a settling tank with 2 hour detention period for treating sewage 378 cu m per hour, is
5 m
5.5 m
6.5 m
7 m
Q.49
Sewer ventilating columns are generally placed at
Distances 150 m to 300 m
Upper ends of branch sewers
Every change in the size of sewers
All the above
Q.50
The coagulant which is generally not used for treating the sewage, is
Alum
Ferric chloride
Ferric sulphate
Chlorinated coppers
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