Civil Engineering :: Waste Water Engineering
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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
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The clarigesters are
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Rate of flow of sewage is generally assumed
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Maximum permissible velocity 1.5 m/sec, is adopted in drains
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The digested sludge from septic tanks, is removed after a maximum period of
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For providing an Indian type W.C., the R.C.C. slabs in the toilet portion
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The gradient of sewers depends upon
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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
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The drop man holes are generally provided in sewers for
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Sewer ventilating columns are generally placed at
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In case of Imhoff tanks,
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If the depth of partial flow in a sewer of diameter 2 m, is 50 cm, its wetted perimeter is
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A drop manhole is provided if
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In a city the ratio of the drainage to sewage is 20, the percentage discharge passing through non-monsoon periods, is
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Pick up the correct statement from the following :
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The liquid wastes from kitchens, bath rooms and wash basins, is not called
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The presence of free ammonia in sewage, is detected by
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The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known
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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
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Pick up the correct statement from the following :
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In sewers the gas generally found, is
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A sewer running partially full and hurried with back filled, fails in compression due to
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A manhole is classified as shallow if its depth is between
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For a circular sewer of diameter D running partially full with central angle α,
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For design purposes, the normal rate of infiltration of ground water into the sewer, is
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The effluent of a septic tank is
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The drainage area of a town is 12 hectares. Its 40% area is hard pavement (K = 0.85), the 40% area is unpaved streets (K = 0.20) and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas as 30 minutes and using theformula ps = \( \frac { 900 } { t+60 } \)the maximum run off is
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The detention period for plain sedimentation water tanks, is usually
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Fresh sewage may become stale in
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Dry water flow in a combined sewer, is
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. Which one of the following tests is used for testing sewer pipes :
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Nitrogen cycle of sewage, is
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In sewers the highest non-scouring velocity is achieved in
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In sewage having fully oxidised organic matter, the nitrogen exists in the form of
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It is customary to design a sewer for D.W.F. on the basis of
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During preliminary treatment of a sewage
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Pick up the correct statement from the following :
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In septic tanks,
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The sewer pipe which carries sewage from a building for immediate disposal is
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The algae dies out in the zone of
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The recommended detention period for grit chambers is
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Pick up the correct statement from the following :
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The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is
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Pick up the correct statement from the following :
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For trunk and out-fall, the type of sewers generally used, is
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Pick up the incorrect statement from the following :
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Hydraulic mean radius is
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A.
\( \frac { d} { D } \) = \(\frac { 1 } { 2 } \) [ 1- cos \(\frac { α } { 2 } \) ] |
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B.
\(\frac { a} { A } \) = [ \(\frac { n} { 360^0 } \) - \(\frac { sina } { 2n } \)] |
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C.
\(\frac { D } { P } \) = [ \(\frac { α} { 360^0 } \) |
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D.
\(\frac { r } { R }\) = [ 1-\( \frac { 360^0 sinα} { 2nα } \) ] |
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E.
all the above. |
A.
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B.
Liberation of nitrogen-liberation of ammonia-formation of nitrites- formation of nitrates |
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C.
Liberation of nitrogen-formation of nitrates-formation of nitrites-liberation of ammonia |
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D.
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E.
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A.
The maximum rate of storm run off is called peak drainage discharge |
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B.
Rational method of estimating peak run off, may be used precisely for areas less than 50 hectares |
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C.
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D.
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E.
All the above. |
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A.
Septic tanks are horizontal continuous flow type of sedimentation tanks |
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B.
Septic tanks are generally provided a detention period of 12 to 36 hours |
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C.
Septic tanks are completely covered and high vent shafts are provided for the escape of foul gases |
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D.
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E.
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