Texas Irrigator License Exam Backflow Questions and Answers, Exams of Agricultural engineering

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Texas Irrigator License Exam Backflow

Questions And Answers 2023

Air Gap - Correct Answer-Gap through air between lowest point of water supply & flood level rim. i.e. Sink water level & faucet Anti-Siphon Device - Correct Answer-Any device that introduces air into the system to prevent back siphonage. AVB (Atmospheric Vacuum Breaker) or PVB (Pressure-type Vacuum Breaker) Atmospheric Vacuum Breaker (AVB) - Correct Answer-Blackflow device that allows air with use of a float. Shape: Like an L Back Pressure: No Constant Pressure: No more than 12 hrs in 24-hr period. Install Height: Vertically with min of 6" higher than all downstream piping and highest downstream head. Install: No shut-off valves downstream. Must be on discharge side of each control valve. Backflow - Correct Answer-Unwanted reversal of water flow Backpressure - Correct Answer-Where pressure in the discharge (outlet or downstream) side is greater than pressure in the supply (inlet or upstream) side. i.e. Gravity from elevation, pump, steam/air pressure. Backsiphonage - Correct Answer-Backflow from negative pressure in the system. i.e Break in city main line or fire department using excessive amount of water. Types of Backflow Preventors - Correct Answer-Air Gap Atmospheric Vacuum Breaker (AVB) Pressure Vacuum Breaker (PVB)

Double Check Valve Assembly (DCVA or DC) Reduced Pressure Principle Device (RP or RPZ) +Double Check Valve Assembly (DCVA) - Correct Answer-Backflow device that uses 2 shut-off valves and 2 check valves to prevent backflow. Degree of Hazard - Correct Answer-Measure of risk to public health. Substances that affect this include pollutants & contaminants. Pollutant - Correct Answer-Substance that may affect color or odor, but not create health hazard. Contaminant - Correct Answer-Substance that may cause illness or death if ingested. Any system labeled as health hazard and that could contain contaminants must use a backflow prevention device and by tested annually. Pressure Vacuum Breaker (PVB) - Correct Answer-Backflow prevention device that uses a spring-loaded check valve and introduction of air to prevent back siphonage. Reduced Pressure Principle Device (RP or RPP or RPZ) - Correct Answer-Backflow prevention device that uses 2 independently acting check valves and an automatic operating pressure differential relief valve between the 2 check valves.

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