Water distribution 2 Latest exam questions and answers

Water distribution 2 Latest exam questions and answers Plastic - CORRECT ANSWER-Most resistant to corrosion Chlorine gas - CORRECT ANSWER-heavier than air, extremely toxic, very corrosive to damp atmospheres Centrifugal pump - CORRECT ANSWER-Most common pump, used for high flow, and low pressure applications booster pumps Positive displacement pump - CORRECT ANSWER-For low flow, high pressure applications. Chemical feed pumps are this type Drawdown - CORRECT ANSWER-The difference in water levels from the point where the pump starts and stops. DC current - CORRECT ANSWER-Electric current used for cathodic protection. Suction head - CORRECT ANSWER-Vertical distance from the surface of water supply to the centerline of the pump Pathogenic bacteria - CORRECT ANSWER-Salmonella, shigella, bacillus, typhoid fever, cholera Physical disinfection - CORRECT ANSWER-Ultraviolet rays, heat, and ultrasonic waves Chemical disinfection - CORRECT ANSWER-Iodine, bromine, bases, ozone, and chlorine Chlorine - CORRECT ANSWER-Greenish yellow gas, that is two and a half times heavier than air Chloramines - CORRECT ANSWER-When chlorine reacts to ammonia it's called Break point chlorination - CORRECT ANSWER-The point at which a measurable amount of free chlorine residual is achieve