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Texas Irrigator License Exam practice test 2023 Questions and Answers 100% Verified
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Texas Irrigator License Exam practice test 2023 Questions and Answers 100% Verified
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By: trentinjackson • 9 months ago
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Texas Irrigator License Exam practice test 2023 Questions and Answers 100% VerifiedGear rotor model B - Spray with X nozzle - Spray with Y nozzle - Spray with Z nozzle - 1" valve model Q - Backflow device - Mainline pipe - Laterals pipe - House service pipe - Sleeves - City main pipe - City meter - Controller - Legend - To convert psi to feet - Multiply by 2.31
To convert feet to psi - Multiply by 0.433 psi
Precipitation Rate Formula - GPM (Full Circle Head) X 96.3
-------------- = PR
Head Spacing X Row Spacing (Divide)
Precipitation Rate for Drip - GPH (one emitter) X 231
------------ = PR Head Spacing (inches) X Row Spacing (inches)
Runtime Formula - I x 60
RT ----=Runtime PR
Calculating Drip Flow Zone - Total Linear feet of drip /emitter spacing x GPH of emitter/ 60 = GPM for that zone
Or DMDMD
Slope formula - Rise
S = -----------
Run
Triangular Head Spacing - Multiply spacing by .866 to get row spacing
Efficiency of System - Example if 50% efficiency with 1.12 Precipitation rate
Divide 1.12 by .50 to get 2.3/PR
Design Pressure - DP = = Recommended head pressure + total losses
Actual Head Pressure - AHP == Static Pressure - Total losses
D - DIVIDE - THE FIRST STEP TELLS YOU HOW MAY ROWS.....DIVIDE THE WIDTH
BY EMITTER SPACING IN FEET (EX; 18" = 1.5 FEET) ALWAYS ADD 1
M -MULTIPLY - THIS STEP TELLS YOU HOW MANY TOTAL FEET...MULTIPLY THE TOTAL ROWS BY THE LENGTH
D - DIVIDE - THIS STEP TELLS YOU HOW MANY TOTAL EMITTERS..DIVIDE THE TOTAL LENGTH BY THE EMITTER SPACING IN FEET
M -MULTIPLY - THIS STEP TELLS YOU HOW MANY TOTAL GALLONS PER HOUR..MULTIPLY THE TOTAL EMITTERS BY THE GPH GIVEN FOR EACH EMITTER
D - DIVIDE - THIS LAST STEP TELLS YOU HOW MANY GALLONS PER MINUTE...DIVIDE THE TOTAL GPH BY 60 TO CONVERT IT TO MINUTES
Double check Assembly Backflow Preventer is suitable for? - Back pressure,back siphonage,but its not suitable for high hazard applications.
Reduced Pressure Principle Backflow Preventer is suitable for? - Back pressure,back siphonage,and is good for high hazard applications. Backflow - . . Back pressure is the irrigation side and backsiphonage is the city side. All backflow devices work for backsiphonage and only the double check and RP work for back pressure. Study what causes backsiphonage and back pressure. You have to know how to install each backflow device including air gap.
Which device can stop backsiphonage? - Pvb,DCA,RP,and AVB
Which device can stop backpressure? - DCA and RP
Which device can handle constant pressure? - RP,DCA,and Pvb
The approved backflow devices for non-health hazards include: - All devices (AVB,PVB,DCA,
and RP)
Which device,or devices,are approved when there is chemical applied by aspiration,injection,or emission? - RP
If there is an on-site sewage facility on site, which backflow is approved? - RP
If major Maintenance has to be performed,which backflow device has to be properly installed prior to the repair work being performed? - An approved backflow device
If including a master valve,where does it have to be installed? - Downstream from the PVB,DCA,or RP
Which devices have to be tested upon installation and annually? - Devices used in applications designated as health hazards
Which backflow device has to be tested upon installation? - All Backflow devices
If a DCA is installed below ground,what device is required? - A Y-Strainer installed on inlet side of the DCA
If there is an additional water source supplying water to a system being supplied by potable water supply,what device has to be used on with the potable water supply ? - RP
What device cannot be used when there is health hazard? - DCA
An AVB and PVB can be used in health hazard situations,if the following conditions are not present: - Backpressure,There is pump downstream,Chemicals added
An Atmospheric Vacuum Breaker - Has to be installed 6'' higher than the highest head or outlet in the retracted position,will not handle constant pressure,and will stop backsiphonage
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