Q.1
Inter-distance between ventilation columns in a sewer line is kept
Q.2
With self cleansing velocity in sewers
Q.3
In areas where rainy season is limited to a few months, the type of sewerage system recommended is
Q.4
For trunk and out-fall, the type of sewers generally used, is
Q.5
The ratio of minimum hourly flow to the average flow of sewage is
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
Q.7
Pick up the correct statement from the following:
Q.8
In sewers designed with self cleansing velocity,
Q.9
The spacing of bars of perforations of fine screens used for the treatment of sewage, is
Q.10
The spacing of bars for perforations in coarse screens used for the treatment of sewage, is
Q.11
The sewer pipe which carries sewage from a building for immediate disposal is
Q.12
The ratio of maximum sewage flow to average sewage flow for trunk mains having diameters more than 1.25 m, is
Q.13
Lead caulked joints are used for laying
Q.14
Pick up the correct statement from the following:
Q.15
The disintegrating pump in which solid matter is broken up before passing out, is
Q.16
Hume steel pipes are
Q.17
The sewer that unloads the sewage at the point of treatment is called
Q.18
In primary sedimentation, the 0.2 mm inorganic solids get separated if specific gravity is
Q.19
Sewer pipes are designed for maximum discharge with 25% to 33% vacant cross-sectional area for
Q.20
Before discharging the foul sewage into rivers, it is generally treated by
Q.21
The following is the physical characteristic of sewage
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
Q.23
If the side of a square sewer is 1000 mm, the diameter of a hydraulically equivalent circular section, is
Q.24
The drop man holes are generally provided in sewers for
Q.25
For a continuous flow type of sedimentation tanks
Q.26
The use of coarse screens for the disposal of sewage, may be dispensed with by
Q.27
Large diameter sewers subjected to external pressure alone, are reinforced
Q.28
The presence of free ammonia in sewage, is detected by
Q.29
In circular sewers if depth of flow is 0.2 times the full depth, the nominal gradient,
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
Q.31
The flow velocity in detritus tanks is
Q.32
In normal conditions, the period for sludge digestion, is
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?
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
Q.35
The rational formula for peak drainage discharge, was evolved by
Q.36
Discrete or granular particles change their
Q.37
The suitable cross-section of sewers to carry combined flow, is
Q.38
Stone ware pipes are
Q.39
Pick up the correct statement from the following:
Q.40
¾th or ¼th extra space is left in sewer pipes at maximum discharge for
Q.41
In detritus tanks,
Q.42
The liquid wastes from kitchens, bath rooms and wash basins, is not called
Q.43
If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity is
Q.44
Self-cleansing velocity is
Q.45
The first stage of neutral process of sludge digestion, is
Q.46
Facultative bacteria survive in
Q.47
A nuisance is experienced in diluting water if dilution factor is less than
Q.48
The width of a settling tank with 2 hour detention period for treating sewage 378 cu m per hour, is
Q.49
Sewer ventilating columns are generally placed at
Q.50
The coagulant which is generally not used for treating the sewage, is
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