Water Distribution Grade 1 Exam| Answered 100% Correctly| 2025

Water Distribution Grade 1 Exam| Answered 100% Correctly| 2025 It is best to use __________ to determine the hydraulic grade line. Pressure gauges What are the 3 most common types of centrifugal pump impellers? Closed, semi-open, open What is the purpose of a check valve? To control the direction of flow Where would be the best place for hydrants to be located? A - Close to buildings B - Near the street C - Near street intersections D - Behind protective barriers C - Near street intersections What type of mechanical pipe cleaning unit has high-carbon spring-steel blades? Metal scrappers What could the loss of pressure in a water system possibly cause, besides compromising fire fighting capabilities? Contamination due to backflow/backsiphonage ______________ valves are most often used where pressure is relatively high and positive shutoff is required, such as the discharge of a high-lift pump. Large plug It is best to have an _________________ to prevent the collapse of a pipe when it is being emptied. Air-and-vacuum relief valve What is a cross-connection? Temporary or permanent physical connection between potable water and unapproved sources What does high water pressure cause? A - More main and service leaks B - More hot water tank failures C - More appliance failures D - All of the above D - All of the above An advantage of _________________ is that there is no flow of water from a broken hyrdant. Dry barrel hydrants What type of pipe has high tensile strength, is low cost, and is good hydraulically when lined but is subject to general corrosion if installed unprotected in a corrosive environment? Steel pipe What type of meter should have a strainer installed ahead of the flow into it to protect it from sediment and other objects in the water? Compound meter What should be inspected on a altitude valve that fills an elevated tank? A - Opening and closing speed to prevent water hammer B - Make sure no oil leaks that could contaminate the water C - Make sure valve is letting enough water in to fill the tank D - Both A and C D - Both A and C What type of large water storage is usually equipped with an adjacent pumping system that can be used in an emergency to pump water to the distribution system? Standpipes What type of valve is used in the distribution system where the main is not buried very deep?