Water distribution 2 Exam Questions and Answers 100%Correct

Chlorine gas - ANSWER-heavier than air, extremely toxic, very corrosive to damp atmospheres Centrifugal pump - ANSWER-Most common pump, used for high flow, and low pressure applications booster pumps Positive displacement pump - ANSWER-For low flow, high pressure applications. Chemical feed pumps are this type Drawdown - ANSWER-The difference in water levels from the point where the pump starts and stops. DC current - ANSWER-Electric current used for cathodic protection. Suction head - ANSWER-Vertical distance from the surface of water supply to the centerline of the pump Pathogenic bacteria - ANSWER-Salmonella, shigella, bacillus, typhoid fever, cholera Physical disinfection - ANSWER-Ultraviolet rays, heat, and ultrasonic waves Chemical disinfection - ANSWER-Iodine, bromine, bases, ozone, and chlorine Chlorine - ANSWER-Greenish yellow gas, that is two and a half times heavier than air Chloramines - ANSWER-When chlorine reacts to ammonia it's called Break point chlorination - ANSWER-The point at which a measurable amount of free chlorine residual is achieved Free available chlorine - ANSWER-The available residual that has not combined with ammonia Gate valves - ANSWER-Used in high pressure applications. Designed to open and close straight line flow but not to regulate flow. Globe valves - ANSWER-Used to regulate flow or pressure, kitchen, or bathroom valves Plug valves - ANSWER-Valves that we use as corporation stops, and meter stops Static water level - ANSWER-The level of the water table when well pump is off 25 feet - ANSWER-In a trench ladders should be no more than