Texas Irrigator License Exam practice test 2023 Questions
and Answers 100% Verified
Gear 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)
and Answers 100% Verified
Gear 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)
