Irrigation Exam Questions And Answers Verified 100% Correct

Irrigation Exam Questions And Answers Verified 100% Correct Generally , sleeves should be at least _____larger than the irrigation piping required. - ANSWER 2 sizes PVC pipe with the same physical dimension as iron pipe? - ANSWER Schedule pipe The process of plant material giving off vapor from the leaves ? - ANSWER Transpiration shock wave created by a fast closing valve ? - ANSWER Water hammer act of chemically fusing PVC pipe and fittings together? - ANSWER solvent welding PVC is an abbreviation for ? - ANSWER Polyvinyl Chloride Flexible part of an automatic valve which regulates the passage of water? - ANSWER Diaphragm What does I.P.S. stand for ? - ANSWER Iron plastic size What does M.I.P. stand for ? - ANSWER male iron pipe An irrigation system with any kind of injection device associated with it would be termed as ____? - ANSWER Health Hazard Which back flow device is required to be used with pumps ? - ANSWER Which ever one is required by state or local codes . The mechanical prevention of reverse flow, or back siphonage , of non-potable water from an irrigation system into the public water system is called ? - ANSWER Back flow prevention Any pressure,regardless of its source ,against the outlet side of the back flow prevention device ,which exceeds the supply pressure against the inlet side of the device is? - ANSWER Back pressure Which back flow device is most recommended for systems with fertilizer injectors? - ANSWER Reduced pressure principle Which back flow device is recommended for low hazard applications? - ANSWER atmospheric vacuum breaker pressure vacuum breaker double check assembly reduced pressure principle all of them. Which back flow device can be installed below grade ? - ANSWER Double check assembly Which back flow device can be under constant pressure? - ANSWER Pressure vacuum breaker Double check assembly Reduced pressure principle Which back flow device is acceptable to use when there is a possibility of back pressure? - ANSWER Double check assembly Reduced pressure principle Which back flow device is recommended to prevent back siphonage ? - ANSWER AVB PVB DCA RPZ An atmospheric vacuum breaker is not suitable for__? - ANSWER Back pressure statement correct - ANSWER A pressure vacuum breaker, unlike the admospheric vacuum breaker, will operate satisfactorily under constant pressure. Back flow in the water distribution system can be caused by: - ANSWER Back pressure and Back siphonage A pressure vacuum breaker may be installed with a : - ANSWER Control valve immediately downstream Back prevention assemblies on high hazard systems should be repaired : - ANSWER When field test results show failure A control valve downstream a back flow device may result in : - ANSWER Constant pressure Where are the shut- offs valves located on an ABV ? - ANSWER There are no shut - off valves How many test cock are on a DCA ? - ANSWER 4 test cocks What will happen if an AVB is installed in the wrong direction ? - ANSWER Water will escape through the top portion of the device Which backflow device will protect against high hazard and back pressure ? - ANSWER Reduced pressure principle An atmospheric vacuum breaker must be installed ___ inches above the highest water outlet. - ANSWER 6 inches A reduced pressure principle device must be installed _____? - ANSWER 12 inches above grade A dual check valve is approved to protect against.? - ANSWER none of them What determines which backflow device you install.? - ANSWER Degree of hazard If water hammer is a problem, then a PBV may be used . - ANSWER A PVB can not protect against water hammer. Which has the highest precipitation rate ? - ANSWER Spray heads. Which head spacing would provide the highest precipitation rate for any given property? - ANSWER Triangular head spacing Precipitation rates from most spray heads _____? - ANSWER Exceeds the infiltration rate of most tight soils. Which soil type would hold the most water? - ANSWER Clay The following would affect the precipitation rate of rotary heads ? - ANSWER erratic head spacing head pressure nozzle size which most rotary heads , if you adjust the arc down (for instance , from 360 to 180 degrees ), the precipitation rate ______. - ANSWER increases with most rotary heads, if you adjust the arc down the discharge rate _____. - ANSWER remains the same.