Civil Engineering :: Waste Water Engineering
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To maintain aerobic biological activity, the moisture content of the compost mass should be about
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The sewer that unloads the sewage at the point of treatment is called
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No treatment of the sewage is given if dilution factor is
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R.M.O. expenses include
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For drainage pipes in buildings the test applied before putting them to use, is
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In normal conditions, the period for sludge digestion, is
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The bottom of the sewage inlet chamber of septic tanks, is provided an outward slope
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For a continuous flow type of sedimentation tanks
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The temperature affects the
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Which of the following pumps in used to pump sewage solids with liquid sewage without clogging the pump is
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For having central angle α, the area of cross-section of sewers running partially full, is
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The pressure exerted by
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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
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The following is the physical characteristic of sewage
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The normal value of over flow rates for plain primary sedimentation tanks, ranges between
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The asbestos cement sewers are
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Bottom openings 15 cm x 15 cm in the standing baffle wall are provided
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Faculative bacterias survive in
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The ratio of maximum sewage flow to average sewage flow for trunk mains having diameters more than 1.25 m, is
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. Acid regression stage of sludge digestion at a temperature 21°C extends over a period of
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Pick up the correct statement from the following :
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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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Pick up the correct statement from the following :
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Cement concrete sewers are only suitable if non-scouring velocity is between
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The grit chambers of sewage treatment plants, are generally cleaned after
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The spacing of bars for perforations in coarse screens used for the treatment of sewage, is
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In very first stage of decomposition of the organic matter in sewage
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The coagulant which is generally not used for treating the sewage, is
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Fresh sewage is generally
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In a trickling filter
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If the flame of a miner's safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains
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The layers of vegetable wastes and night soil alternatively piled above the ground to form a mound, is called
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If the discharge of a sewer running half is 628 1.p.s., i = 0.001, and n = 0.010, the diameter of the sewer, is
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For efficient working of a sewer, it must be ensured that
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A manhole is generally provided at each
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Pick up the correct statement from the following :
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In Chezy's formula V = C \(\sqrt{rs}\) for calculating the velocity of flow in circular sewer of diameter D running full, the value of hydraulic mean radius is
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The sewer which collects the discharge from a collecting system and delivers it to a treatment plant, is known
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If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is
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If the flame of a miner's safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains
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The underground sewers are more subjected to
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Pick up the correct statement from the following :
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The sewer pipes
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The normal values of over flow rates for secondary sedimentation tanks, ranges between
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The Brake Horse power of the motor (efficiency 60%) required for a pump of capacity 0.075 cumec for a total lift of 12 m, is
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A.
A = \( \frac { D^2} { 2 } \) [\(\frac { nα } { 180^0 } \) -- \(\frac { sin α } { 2 } ]\) |
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B.
A = \( \frac { D^2} { 4 } \)[ \(\frac { nα } { 360^0 } \) - \(\frac { sin α } { 2 } ]\) |
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C.
A = \( \frac { D^2} { 4 } \) [ \(\frac { nα } { 360^0 } \) - \(\frac { cos α } { 2 } ]\) |
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D.
A =\( \frac { D^2} { 2 } \) [ \(\frac { nα } { 360^0 } \) - \(\frac { cos α } { 2 } ]\) |
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A.
The mixture of water and waste products, is called sewage |
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B.
The treated sewage effluents, are generally used for irrigating the crops |
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C.
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D.
The old convergency system was definitely better than water carried sewerage system |
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E.
The old convergency system was definitely better than water carried sewerage system |
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A.
Hydrogen sulphide gas in excess, may cause corrosion of concrete sewers |
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B.
4 ppm of Dissolved Oxygen (D.O.) is ensured before discharging the treated sewage in river |
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C.
Solubility of oxygen in sewage is 95% of that of distilled water |
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D.
Dissolved oxygen content of sewage, may be determined by Winkler's method |
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E.
All the above. |
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A.
Rate of digestion of slugde is more at higher temperature |
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B.
Thermophilic organisms digest the sludge if the temperature ranges from 40° to 60°C |
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C.
Mesophilic organisms digest the sludge if the temperature is between 25° and 40°C |
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D.
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E.
All the above. |
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A.
the sewer pipes of sizes less than 0.4 m diameter are designed as running full at maximum discharge |
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B.
the sewer pipes of sizes greater than 0.4 m diameter are designed as running 2/3rd or 3/4th full at maximum discharge |
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C.
the minimum design velocity of sewer pipes is taken as 0.8 m/sec |
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D.
all the above. |