TEXAS IRRIGATION LICENSE EXAM LATEST REAL EXAM 100 QUESTIONS AND CORRECT ANSWERS A+ GRADE

How many feet of head does it take to equal 1 PSI? - ANSWER- 2.31 To gain .433 PSI, your piping would have ....? - ANSWER- Elevation loss of 1 ft. A loss in PSI is a result of ? - ANSWER- An elevation gain in the piping Water pressure is measured in ? - ANSWER- PSI PSI stand for ? - ANSWER- Pound per square inch If water travels downhill , what happens to the PSI? - ANSWER- An increase Water will seek it's own lowest level by what force of nature? - ANSWER- gravity What is the weight of one cubic foot of water? - ANSWER- 62.4 Ibs What is the weight of one gallon of water ? - ANSWER- 8.3 pounds 1 Acre is equal to - ANSWER- 43,560 square ft. 1 Cubic ft. of water contains .... - ANSWER- 7.4805 gallons 1 ft of head equals - ANSWER- .433 PSI 1 PSI equals - ANSWER- 2.31 ft of head 1 section of land equals ... - ANSWER- 640 acres 1 Acre ft equals - ANSWER- 43,560 cubic ft. What is the undesirable reversal of the flow of water or mixtures of water and other undesirable substances from any source? - ANSWER- Backflow Occurs when the user system is at a higher pressure than the supply water systems allowing undesirable substances to be pushed back - ANSWER- backpressure Occurs when negative or reduced pressure exists in the supply piping - ANSWERbacksiphonage What is the most common form of a cross connection? - ANSWER- Garden hose because it can connect the the portable water supply What is potentially dangerous about an unprotected still cock? - ANSWER- A hose can be used for watering purposes, but it left in pools, elevated shrubs , or ground where there are chemicals it can be dangerous. What can be used to protect a still cock? - ANSWER- A hose bibb vacum beaker Will an anti-siphon vacuum beaker protect against a backpressure backflow condition ? - ANSWER- No, contaminated water will pass through the orifice into water supply line if the downstream pressure increases over the supply pressure. Can an atmospheric vacuum beaker be used on lawn sprinkler systems? - ANSWER- Yes, they will protect the portable water supply if it's installed 6" above the highest sprinkler head and shall have no control vales located downstream. What is the pressure that us supplied continuously to a backflow preventer for periods of over 12 hours at a time? - ANSWER- Continuous pressure Contamination from a sucken hose bibb pitt that caused backflow into the field house drinking bubbler. - ANSWER- Holy Cross Football team Five Cross Contamination Connections - ANSWER- 1. Air gap 2.Atmospheric Vacuum beakers 3. Pressure vacuum beakers 4.Double check valve assembly 5.Reduced Pressure Zone backflow preventers What is the physical separation of the portable and non-portable systems by an air space? - ANSWER- Air Gap Liquid , solids or gases that may create a danger to health is called ? - ANSWERToxic Substance What is the benefit of a strainer preceding a backflow preventer? - ANSWER- A strainer will protect the check valves from fouling due to foreign matter and debris which may be flowing through the line. Formula for Precipitation Rate - ANSWER- Total gallons (gpm) X 96.25 / Total area (sq. ft. ) Formula For Drip Irrigation PR (IN/HR) - ANSWER- 231.1 X Dripper Flow Rate (GPH)/ Dripper Spacing X Dripperline Spacing What is the amount of water passed off as vapor to the atmosphere from the soil (evaporation) and from the plant leaves (transportation) ? - ANSWE