Water Distribution 1 Questions and Answers 100% Correct!

Head is measured in - ANSWER-feet A plat is - ANSWER-A map Which type of valve will prevent the collapse of a pipe - ANSWER-Air-and-vaccume relief valve The highest degree of protection of a coated steel pipe is - ANSWER-cathodic protection At which time of day is the age of the water stored in the distribution system the highest? - ANSWER-In the morning One of chlorines advantages is that it - ANSWER-has a persistent residual Chlorine gas is _____ times heavier than air. - 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. - ANSWER-Coliform test Which is the best and most reliable way of finding a very small chlorine leak? - 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 - 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 - ANSWER-6 hours Samples collected for cloakrooms are collected in plastic bottles that must contain - ANSWER-Sodium thiosulfate The volume of a sample for coliform compliance is - ANSWER-100 ml If a water sample is not analyzed immediately for chlorine residual, it is acceptable to be analyzed within - ANSWER-15 minutes The heart of a pump is called the - ANSWER-impeller Which device serves the same function as the packing - ANSWER-Mechanical seal Which is used to stop air leakage into the casing around the pump shaft - ANSWER-seals