Water Supply Engineering Questions

• The bed slope in slow sand filters, is generally kept
• In plain sedimentation tanks under normal conditions, impurities are removed upto
• The population of a city in 2000 is 50,000. The average increase in population over last 8 decades is 7500 and average incremental increase during 8 decades is 750. The population of the city based on incremental method, in the year 2020 will be
• Air inlet valve in water mains, is generally provided at
• Pick up the incorrect statement from the following :
• S1 and S2 are the draw downs in an observation well at times t1 and t2 after pumping. For discharge Q and coefficient of transmissibility T, the relationship, is
• Efficiency of removing bacterias from raw water by a slow sand filter, is
• De-chlorination is followed by
• The duration of contact of chlorine with water before it is served to the first consumer, should be at least
• Underground water is obtained from
• Pick up the correct statement from the following :
• Cast iron pipes
• The intake opening is generally covered by a screen to prevent entry of debris etc. and its level is kept
• Plain chlorination is used for water
• P.V.C. pipes can withstand pressure bead of water upto
• Open channels supported over tres-les, are generally known as
• The maximum non-verticality of the bore of a well 200 m deep, may be permitted up to
• Pick up the correct statement from the following :
• From the surface of reservoir, evaporation may be minimised by sprinkling
• According to Godrich the ratio of peak demand rate to mean demand is