Wastewater Collection System: Maintenance Questions and Answers, Exams of Water and Wastewater Engineering

Download Wastewater Collection System: Maintenance Questions and Answers and more Exams Water and Wastewater Engineering in PDF only on Docsity! Maintenance of Wastewater Collection System Questions and Answers When a fire hydrant is operated, it should be - correct answer a. Just opened enough to have flow b. Opened fully c. Opened halfway d. Regulated to the flow required Which of the following is the MOST common factor leading to the generation of hydrogen sulfide in sewers? - correct answer a. Anaerobic conditions b. Constant high velocity of flow in sewers c. Low concentrations of ferrous sulfides d. Presence of fats, oils and grease Emergency stoppages in sewer lines may NOT be cleared safety by the use of - correct answer a. Hand rods b. High velocity of flow in sewers c. Power rodders d. Fire hoses You are the operator of a high velocity cleaner attempting to break a stoppage. The distance of the leader hose and nozzle on your pressure line is 17 feet. You set the footage counter to read "zero" as the leader hose Maintenance of Wastewater Collection System Questions and Answers coupling enters the pipe. When the counter reads 124 feet you hit an obstruction and can go no further. Approximately how far is obstruction from the manhole? - correct answer a. 124 feet b. 141 feet c. 107 feet d. 163 feet Bucket machine are best used for the removal of - correct answer a. Grease b. Roots c. Debris d. Stoppages Wastewater flowing at 15% of design flow through a 60-in interceptor may allow - correct answer a. Photosynthesis to take place in the collection system b. Combined sewers to relieve the wastewater load c. The wastewater to scour the collection system piping d. The solids to settle out and the wastewater to turn septic