The suitable system of sanitation for area of distributed rainfall throughout the year with less intensity is
A. Separate system
B. Combined system
C. Partially separate system
D. Partially combined system
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In lime-soda process
A. Only carbonate hardness is removed
B. Only noncarbonated hardness is removed
C. Lime reduces the carbonate hardness and soda-ash removes the non-carbonate hardness
D. Lime reduces the non-carbonate hardness and soda-ash removes the carbonate hardness
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Scour valves are provided
A. At street corners to control the flow of water
B. At every depression and dead ends to drain out the waste water that may collect there
C. At the foot of rising main along the slope to prevent back running of water
D. At every summit of rising mains
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If the average daily consumption of a city is 1,00,000 m3 , the maximum daily consumption on peak hourly demand will be
A. 1,00,000 m3
B. 1,50,000 m3
C. 1,80,000 m3
D. 2,70,000 m3
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Sewerage system is designed for
A. Maximum flow only
B. Minimum flow only
C. Average flow only
D. Maximum and minimum flow
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The process of lagooning is primarily a means of
A. Reducing the excessive flow in sewers
B. Disposing of sludge
C. Increasing the capacity of storage reservoirs
D. Increasing flow of sewage through imhoff tanks
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The ratio of 5 day BOD to ultimate BOD is about
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The type of valve, which is provided on the suction pipe in a tube-well, is
A. Air relief valve
B. Reflux valve
C. Pressure relief valve
D. Sluice valve
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For a given discharge, the efficiency of sedimentation tank can be increased by
A. Increasing the depth of tank
B. Decreasing the depth of tank
C. Increasing the surface area of tank
D. Decreasing the surface area of tank
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The settling velocity of a particle in a sedimentation tank depends on
A. Depth of tank
B. Surface area of tank
C. Both depth and surface area of tank
D. None of the above
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The population of a town in three consecutive years are 5000, 7000 and 8400 respectively. The population of the town in the fourth consecutive year according to geometrical increase method is
A. 9500
B. 9800
C. 10100
D. 10920
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The suitable method of forecasting population for a young and rapidly increasing city is
A. Arithmetical increase method
B. Geometrical increase method
C. Incremental increase method
D. Graphical method
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Average rate of water consumption per head per day as per Indian Standard is
A. 100 liters
B. 135 liters
C. 165 liters
D. 200 liters
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The suitable layout of distribution system for a city with roads of rectangular pattern is
A. Grid iron system
B. Dead end system
C. Ring system
D. Radial system
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The pipe which is used to carry the discharge from sanitary fittings like bath rooms, kitchens etc. is called
A. Waste pipe
B. Soil pipe
C. Vent pipe
D. Anti-siphonage pipe
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The effect of increasing diameter of sewer on the self cleansing velocity is
A. To decrease it
B. To increase it
C. Fluctuating
D. Nil
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For the same solid content, if the quantity of sludge with moisture content of 98% is X, then the quantity of sludge with moisture content of 96% will be
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The relative stability of a sewage sample, whose dissolved oxygen is same as the total oxygen required to satisfy BOD, is
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The alum, when added as a coagulant in water
A. Does not require alkalinity in water for flocculation
B. Does not affect pH value of water
C. Increases pH value of water
D. Decreases pH value of water
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Standard BOD is measured at
A. 20°C - 1 day
B. 25°C - 3 day
C. 20°C - 5 day
D. 30°C - 5 day
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