Water Distribution 1 Final exam questions and answers 100% verified

Water Distribution 1 Final exam questions and answers 100% verified Head is measured in - CORRECT ANSWER-feet A plat is - CORRECT ANSWER-A map Which type of valve will prevent the collapse of a pipe - CORRECT ANSWER-Air-andvaccume relief valve The highest degree of protection of a coated steel pipe is - CORRECT ANSWERcathodic protection At which time of day is the age of the water stored in the distribution system the highest? - CORRECT ANSWER-In the morning One of chlorines advantages is that it - CORRECT ANSWER-has a persistent residual Chlorine gas is _____ times heavier than air. - CORRECT ANSWER-2.5 After a water storage tank has been chlorinated, which bacteriological test must prove negative before the tank is put back into service. - CORRECT ANSWER-Coliform test Which is the best and most reliable way of finding a very small chlorine leak? - CORRECT ANSWER-Use a chlorine gas detector and place it near any area suspected of leaking. The minimum required free chlorine residual anywhere in the distribution system is - CORRECT ANSWER-a detectable level First draw samples for the analysis of lead and copper water must be collected from taps where the water has stood motionless in the plumbing for at least - CORRECT ANSWER-6 hours Samples collected for cloakrooms are collected in plastic bottles that must contain - CORRECT ANSWER-Sodium thiosulfate The volume of a sample for coliform compliance is - CORRECT ANSWER-100 ml If a water sample is not analyzed immediately for chlorine residual, it is acceptable to be analyzed within - CORRECT ANSWER-15 minutes The heart of a pump is called the - CORRECT ANSWER-impeller Which device serves the same function as the packing - CORRECT ANSWERMechanical seal Which is used to stop air leakage into the casing around