Civil Engineering :: Waste Water Engineering
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A nuisance is experienced in diluting water if dilution factor is less than
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Traps
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For estimating the peak run off the rational formula Q = 0.0278 KpA was evolved by
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Pick up the correct statement from the following :
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Pick up the correct statement from the following :
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3.0 ml of raw sewage is diluted to 300 ml. The D.O. concentration of the diluted sample at the beginning of the test was 8 mg/l. After 5 day-incubation at 20°C, the DO. concentration was 5 mg/l. The BOD of raw sewerage is
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The arrangement made for passing the sewer line below an obstruction below the hydraulic gradient lines called
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The angle subtended by the surface of sewer water with partial flow, at sewer centre is 120°, the depth of sewerage is
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Imhoff cone is used to determine
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The sewage discharge in a detritus tank of a treatment plant is 576 litres/sec with flow velocity of 0.2 m/sec. If the ratio of width to depth is 2, the depth is
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The sewer which received discharge from two or more main sewers, is known as
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A well oxidized sewage contains nitrogen mainly as
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A safety lamp when inserted in the upper portion of a manhole causes flames. It indicates the presence of
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Assertion (A) : A free board of 0.3 m is provided above the top sewage line in septic tanks.
Reason (R) : It helps to accommodate the scum in the septic tank.
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If D is the diameter of upper circular portion, the area of cross-section of a standard egg shaped sewer, is
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Drop manholes at the junctions of sewer lines, are provided if
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The most effective arrangement for diverting excess storm water into a natural drainage, is
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Large diameter sewers subjected to external pressure alone, are reinforced
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Pick up the correct statement from the following :
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. In sewage, the solids in mg per litre is
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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
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If D is the diameter of upper circular portion, the overall depth of New Egg shaped sewer section, is
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During putrifaction process of sewage the gas given off, is
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A circular sewer section is preferred to because
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Assertion (A) : The minimum self cleansing velocity in the sewer, at least once a day, must be generated.
Reason (R) : If certain deposition takes place and is not removed, it obstructs free flow and causes further deposition leading to complete blocking of the sewer.
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If the grit in grit chambers is 4.5 million litres per day, its cleaning is done
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The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is
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The detention time (t) of a settling tank, may be defined as the time required for
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For a peak discharge of 0.0157 cumec, with a velocity of 0.9 m/sec, the diameter of the sewer main, is
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For design of sewers, percentage of sewage discharge is assumed
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In case of sewer lines
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The sewerage system originates from
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In sewers the velocity of flow should not be
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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
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If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains
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The design period of sewage treatment works in normally
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The porosity of sediments in sewer pipes, is usually taken as
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In septic tanks, decomposition of organic bacteria, is done by
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The stone ware sewers
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'Cowl' is provided at
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The sewer which transports the sewage to the point of treatment, is called
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Kjedahl nitrogen is a mixture of
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Pick up the incorrect statement from the following :
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. Pick up the correct statement from the following :
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You are asked to design sewer pipes of diameters 0.4 m to 0.9 m at maximum flow, you will assume the sewer flow running at
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The ratio of depths at partial flow with central angle α and at full flow of a sewer, is
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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
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A.
The boning rod is used for checking the levels of the sewer inverts |
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B.
Manhole covers are made circular for the convenience of the cleaning staff |
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C.
A manhole is classified as deep manhole if its depth is more than 1.5 m |
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D.
A manhole is classified as shallow manhole if its depth is. less than 0.9 m |
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E.
All the above. |
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A.
The ratio of the quantity of the diluting water to that of the sewage, is known as dilution factor |
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B.
The automatic purification of polluted water, is known self purification phenomenon |
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C.
The photosynthesis is carried out in the presence of sun ligh |
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D.
Grab sample is generally obtained from the surface where turbulence mixes the sewage particles |
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E.
All the above. |
A.
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B.
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C.
The gases produced in sludge digestion process, contain 75% carbon dioxide |
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D.
The gases produced in sludge digestion process, contain 75% methane. |
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A.
The circular section of sewers provides maximum hydraulic mean depth |
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B.
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C.
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D.
Two sewers of different shapes are said to be hydraulically equivalent if they discharge at the same rate while running full on the same grade |
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E.
All the above. |