Water Distribution Exam Questions With Correct Answers

A noisy or vibrating valve may be an indication of what? - Answer Cavitation The selective destruction or inactivation of pathogenic organisms is - Answer Disinfection Pathogenic organisms can be removed from water, killed, or inactivated by - Answer Filtration The most commonly used distribution system disinfection is - Answer Free chlorine A greenish- yellow gas with a penetrating and distinctive odor, two and a half times heavier than air is - Answer Chlorine A brief session to discuss aspects of a job and safety - Answer Tailgate safety meeting The most common means of disinfecting drinking water used today to protect the public's health? - Answer Chlorination What is the responsibility of water distribution system operators? - Answer Ensure safe and pleasant drinking water is delivered to everyone's tap A valve that automatically shuts off the flow into an elevated tank when the water level in the tank reaches a predetermined level. - Answer Altitude valve A pump consisting of an impeller fixed on a rotating shaft, that is enclosed in a casing, and having an inlet and a discharge connection would be called - Answer Centrifugal pump What is the MAIN purpose of a water storage facility? - Answer To provide sufficient supply of water to average daily demands on the water supply system When is the best time to take a storage tank out of service? - Answer When consumption is lowest Gauges are commonly used on which side of a pump? - Answer Discharge side A condition which atmospheric or dissolved molecular oxygen is present in the aquatic environment is called - Answer Aerobic What is palatable water - Answer Pleasing to the senses (tastes, odors, colors, and turbidity) All trenches must be effectively shored at ____ ft. or deeper - Answer 5ft OSHA defines____________ as a person capable of identifying existing hazards in the surroundings, or working conditions which are unsanitary, hazardous or dangerous to employees, and who has authorization to take prompt corrective measures to eliminate the hazards. - Answer Competent person