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You Are On Multi Choice Question Bank SET 915
45751. In septic tanks,
(A): free board of 0.3 m may be provided (B): the baffles or tees are extended up to top level of scum (C): the clear space between the baffle top and covering slab is about 7.5 cm (D): the inlet is kept 30 cm below the sewage line and outlet is kept at a level 40% depth of the sewage (E): all the above.
45752. The sewer pipe which carries sewage from a building for immediate disposal is
(A): house sewer (B): lateral sewer (C): intercepting sewer (D): main sewer.
45753. The algae dies out in the zone of
(A): degradation (B): active decomposition (C): recovery (D): cleaner water.
45754. The recommended detention period for grit chambers is
(A): 1 minute (B): 2 minutes (C): 3 minutes (D): 5 minutes.
45755. The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is
(A): 1.095 (B): 1.085 (C): 1.075 (D): 1.065
45756. For trunk and out-fall, the type of sewers generally used, is
(A): standard egg shaped (B): circular shaped (C): horse shoe shaped (D): parabolic shaped (E): semi-elliptical shaped.
45757. Hydraulic mean radius is
(A): mean radius of sewer (B): difference in heads between two points in circular pipes (C): mean of radii in a pipe line of varying cross-sections (D): cross-sectional area/wetted perimeter.
45758. The pH value of fresh sewage is usually
(A): equal to 7 (B): more than 7 (C): less than 7 (D): equal to zero.
45759. The moisture content of a sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is
(A): 25% (B): 50% (C): 10% (D): 5%.
45760. Inter-distance between ventilation columns in a sewer line is kept
(A): 25 to 50 m (B): 50 m to 100 m (C): 100 m to 150 m (D): 150 m to 300 m.
45761. The factor responsible for purification of sewage in river is
(A): Hydrology (B): Dissolved oxygen in water (C): Temperature (D): Turbulence (E): All the above.
45762. If the peak discharge of a storm water drain (S.W. Drain) is e.xpected to exceed 150 cumecs, the free board to be provided, is
(A): 100 cm (B): 90 cm (C): 80 cm (D): 50 cm.
45763. PH value of sludge during alkaline regression stage, is
(A): more than 7 (B): less than 7 (C): less than 6 (D): more than 6.
45764. Depletion of ozone layer in the outer atmosphere may cause
(A): lung cancer (B): skin cancer (C): bronchitis (D): heart disorder.
45765. The spacing of bars of perforations of fine screens used for the treatment of sewage, is
(A): 2 to 3 mm (B): 3 to 5 mm (C): 5 to 8 mm (D): 8 to 10 mm.
45766. The self-cleansing velocity of water flowing through pipe lines, is
(A): 2 metres/sec (B): 1 metre/sec (C): 0.5 metre/sec (D): 0.25 metre/sec.
45767. Ventilating shafts are provided to a sewer line at every
(A): 100 m (B): 150 m (C): 200 m (D): 300 m (E): 500 m.
45768. Which one of the following part of human body withstands minimum radiation
(A): thyroid (B): kidneys (C): eyes (D): ovaries/testis.
45769. The water carried sewerage system removes
(A): domestic sewage (B): industrial sewage (C): storm sewage (D): all the above.
45770. Stoneware sewers are available in size
(A): 10 cm (B): 15 cm (C): 20 cm (D): 25 cm (E): all the above.
45771. The sludge does not contain waste water from
(A): bath rooms (B): wash basins (C): kitchen sinks (D): toilets.
45772. If the depth of flow in a circular sewer is 1/4th of its diameter D, the wetted perimeter is
(A): πD.
45773. The maximum diameter of sewers adopted in the designs is
(A): 1.0 m (B): 2.0 m (C): 3.0 m (D): 4.0 m.
45774. Sluge banks are formed if sewage is disposed of in
(A): rivers (B): seas (C): lakes (D): none of these.
45775. Design period of 40 to 50 years is adopted for
(A): branch sewers (B): main sewers (C): trunk sewers (D): all the above.
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