TEXAS IRRIGATION FINAL PAPER 2025/2026 QUESTIONS
AND ANSWERS RATED A+
✔✔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? - ✔✔Back pressure
✔✔Which back flow device is most recommended for systems with fertilizer injectors? -
✔✔Reduced pressure principle
✔✔Which back flow device is recommended for low hazard applications? -
✔✔atmospheric vacuum breaker
pressure vacuum breaker
double check assembly
reduced pressure principle
all of them.
✔✔Which back flow device can be installed below grade ? - ✔✔Double check assembly
✔✔Which back flow device can be under constant pressure? - ✔✔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? - ✔✔Double check assembly
Reduced pressure principle
✔✔Which back flow device is recommended to prevent back siphonage ? - ✔✔AVB
PVB
DCA
RPZ
✔✔An atmospheric vacuum breaker is not suitable for__? - ✔✔Back pressure
✔✔statement correct>>> - ✔✔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: - ✔✔Back pressure
and Back siphonage
✔✔A pressure vacuum breaker may be installed with a : - ✔✔Control valve immediately
downstream
, ✔✔Back prevention assemblies on high hazard systems should be repaired : -
✔✔When field test results show failure
✔✔A control valve downstream a back flow device may result in : - ✔✔Constant
pressure
✔✔Where are the shut- offs valves located on an ABV ? - ✔✔There are no shut - off
valves
✔✔How many test cock are on a DCA ? - ✔✔4 test cocks
✔✔What will happen if an AVB is installed in the wrong direction ? - ✔✔Water will
escape through the top portion of the device
✔✔Which backflow device will protect against high hazard and back pressure ? -
✔✔Reduced pressure principle
✔✔An atmospheric vacuum breaker must be installed ___ inches above the highest
water outlet. - ✔✔6 inches
✔✔A reduced pressure principle device must be installed _____? - ✔✔12 inches above
grade
✔✔A dual check valve is approved to protect against.? - ✔✔none of them
✔✔What determines which backflow device you install.? - ✔✔Degree of hazard
✔✔If water hammer is a problem, then a PBV may be used . - ✔✔A PVB can not
protect against water hammer.
✔✔Which has the highest precipitation rate ? - ✔✔Spray heads.
✔✔Which head spacing would provide the highest precipitation rate for any given
property? - ✔✔Triangular head spacing
✔✔Precipitation rates from most spray heads _____? - ✔✔Exceeds the infiltration rate
of most tight soils.
✔✔Which soil type would hold the most water? - ✔✔Clay
✔✔The following would affect the precipitation rate of rotary heads ? - ✔✔erratic head
spacing
head pressure
AND ANSWERS RATED A+
✔✔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? - ✔✔Back pressure
✔✔Which back flow device is most recommended for systems with fertilizer injectors? -
✔✔Reduced pressure principle
✔✔Which back flow device is recommended for low hazard applications? -
✔✔atmospheric vacuum breaker
pressure vacuum breaker
double check assembly
reduced pressure principle
all of them.
✔✔Which back flow device can be installed below grade ? - ✔✔Double check assembly
✔✔Which back flow device can be under constant pressure? - ✔✔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? - ✔✔Double check assembly
Reduced pressure principle
✔✔Which back flow device is recommended to prevent back siphonage ? - ✔✔AVB
PVB
DCA
RPZ
✔✔An atmospheric vacuum breaker is not suitable for__? - ✔✔Back pressure
✔✔statement correct>>> - ✔✔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: - ✔✔Back pressure
and Back siphonage
✔✔A pressure vacuum breaker may be installed with a : - ✔✔Control valve immediately
downstream
, ✔✔Back prevention assemblies on high hazard systems should be repaired : -
✔✔When field test results show failure
✔✔A control valve downstream a back flow device may result in : - ✔✔Constant
pressure
✔✔Where are the shut- offs valves located on an ABV ? - ✔✔There are no shut - off
valves
✔✔How many test cock are on a DCA ? - ✔✔4 test cocks
✔✔What will happen if an AVB is installed in the wrong direction ? - ✔✔Water will
escape through the top portion of the device
✔✔Which backflow device will protect against high hazard and back pressure ? -
✔✔Reduced pressure principle
✔✔An atmospheric vacuum breaker must be installed ___ inches above the highest
water outlet. - ✔✔6 inches
✔✔A reduced pressure principle device must be installed _____? - ✔✔12 inches above
grade
✔✔A dual check valve is approved to protect against.? - ✔✔none of them
✔✔What determines which backflow device you install.? - ✔✔Degree of hazard
✔✔If water hammer is a problem, then a PBV may be used . - ✔✔A PVB can not
protect against water hammer.
✔✔Which has the highest precipitation rate ? - ✔✔Spray heads.
✔✔Which head spacing would provide the highest precipitation rate for any given
property? - ✔✔Triangular head spacing
✔✔Precipitation rates from most spray heads _____? - ✔✔Exceeds the infiltration rate
of most tight soils.
✔✔Which soil type would hold the most water? - ✔✔Clay
✔✔The following would affect the precipitation rate of rotary heads ? - ✔✔erratic head
spacing
head pressure
