Water Supply Engineering Online Test – Multiple Choice Questions and Answers 1. Pick up the correct statement from the following : The amount of rainfall in one year, is known as annual rainfall The ratio of the actual rainfall in the year to the normal rainfall at a place, is called index of the wetness The rain cycle period in India is taken as 35 years All 2. The detention period for plain sedimentation water tanks, is usually 4 to 8 hours 8 to 16 hours 16 to 24 hours 24 to 36 hours 3. The best process of disinfection of public water supply, is by adding lime adding zone boiling chlorination 4. The prescribed hardness limit of potable water ranges between 50 to 75 P.P.M 75 to 115 P.P.M 100 to 150 P.P.M 150 to 200 P.P.M 5. One degree of hardness of water means a content of salts of 10.25 mg/litre 12.25 mg/litre 14.25 mg/litre 16.25 mg/litre 6. Mostly used coagulant, is lime bleaching powder alum chlorine 7. Rapid gravity filter can only remove turbidity of water upto 15 to 25 gm/litre 25 to 30 gm/litre 30 to 35 cm/litre 35 to 40 gm/litre 8. Sluice valves are fitted in a distribution system at the branching off points of sub-mains at the junctions of the pipes along straight length of pipes at suitable intervals All 9. The cast iron pipes for water supply system are used for easy connection strength low maintenance cost All 10. A water channel supported above the ground over trestles, is generally called canal adueduct flume tunnel Loading … Question 1 of 10
