Exam practice test for Texas Irrigator
License (100% Accurate!!)
Gear rotor model B - ANSWER
Spray with X nozzle - ANSWER
Spray with Y nozzle - ANSWER
Spray with Z nozzle - ANSWER
1" valve model Q - ANSWER
Backflow device - ANSWER
Mainline pipe - ANSWER
Laterals pipe - ANSWER
House service pipe - ANSWER
Sleeves - ANSWER
City main pipe - ANSWER
City meter - ANSWER
Controller - ANSWER
Legend - ANSWER
To convert psi to feet - ANSWERMultiply by 2.31
To convert feet to psi - ANSWERMultiply by 0.433 psi
Precipitation Rate Formula - ANSWERGPM (Full Circle Head) X 96.3
-------------- = PR
Head Spacing X Row Spacing (Divide)
Precipitation Rate for Drip - ANSWERGPH (one emitter) X 231
------------ = PR
Head Spacing (inches) X Row Spacing (inches)
Runtime Formula - ANSWERI x 60
RT ----=Runtime
PR
Calculating Drip Flow Zone - ANSWERTotal Linear feet of drip /emitter spacing x GPH of emitter/ 60 =
GPM for that zone
,Or DMDMD
Slope formula - ANSWERRise
S = -----------
Run
Triangular Head Spacing - ANSWERMultiply spacing by .866 to get row spacing
Efficiency of System - ANSWERExample if 50% efficiency with 1.12 Precipitation rate
Divide 1.12 by .50 to get 2.3/PR
Design Pressure - ANSWERDP = = Recommended head pressure + total losses
Actual Head Pressure - ANSWERAHP == Static Pressure - Total losses
D - DIVIDE - ANSWERTHE 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 - ANSWERTHIS STEP TELLS YOU HOW MANY TOTAL FEET...MULTIPLY THE TOTAL ROWS
BY THE LENGTH
D - DIVIDE - ANSWERTHIS STEP TELLS YOU HOW MANY TOTAL EMITTERS..DIVIDE THE TOTAL LENGTH
BY THE EMITTER SPACING IN FEET
M -MULTIPLY - ANSWERTHIS STEP TELLS YOU HOW MANY TOTAL GALLONS PER HOUR..MULTIPLY THE
TOTAL EMITTERS BY THE GPH GIVEN FOR EACH EMITTER
D - DIVIDE - ANSWERTHIS 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? - ANSWERBack pressure,back
siphonage,but its not suitable for high hazard applications.
Reduced Pressure Principle Backflow Preventer is suitable for? - ANSWERBack pressure,back
siphonage,and is good for high hazard applications.
Backflow - ANSWER. . 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? - ANSWERPvb,DCA,RP,and AVB
Which device can stop backpressure? - ANSWERDCA and RP
Which device can handle constant pressure? - ANSWERRP,DCA,and Pvb
The approved backflow devices for non-health hazards include: - ANSWERAll devices (AVB,PVB,DCA,
and RP)
Which device,or devices,are approved when there is chemical applied by aspiration,injection,or
emission? - ANSWERRP
If there is an on-site sewage facility on site, which backflow is approved? - ANSWERRP
, If major Maintenance has to be performed,which backflow device has to be properly installed prior
to the repair work being performed? - ANSWERAn approved backflow device
If including a master valve,where does it have to be installed? - ANSWERDownstream from the
PVB,DCA,or RP
Which devices have to be tested upon installation and annually? - ANSWERDevices used in
applications designated as health hazards
Which backflow device has to be tested upon installation? - ANSWERAll Backflow devices
If a DCA is installed below ground,what device is required? - ANSWERA 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 ? - ANSWERRP
What device cannot be used when there is health hazard? - ANSWERDCA
An AVB and PVB can be used in health hazard situations,if the following conditions are not present: -
ANSWERBackpressure,There is pump downstream,Chemicals added
An Atmospheric Vacuum Breaker - ANSWERHas to be installed 6'' higher than the highest head or
outlet in the retracted position,will not handle constant pressure,and will stop backsiphonage
What is the unwanted reversal of water flow in an irrigation system? - ANSWERBackflow
A cross connection is any actual or potential connection between a potable water supply and: -
ANSWERAny source that has the possibility to introduce polluted or contaminated water back into
the potable water that is supplying it
Backsiphonage is caused by? - ANSWERNegative or sub-atmospheric pressure
Backsiphonage can be caused by: - ANSWERA break in the City Main or
The fire department using water from the city fire hydrant to put out a fire..
If the pressure in the sprinkler system(or downstream side)exceeds the pressure in the supply
side,what phenomenon can occur? - ANSWERBackpressure
What can cause backpressure ? - ANSWERGravity or a pump
How many total ways are there to protect against backpressure and/or backsiphonage? - ANSWER5
total
What is the unobstructed vertical distance through free atmosphere between the lowest point of a
water supply outlet and the flood level rim of the fixture or assembly into which the outlet
discharges? - ANSWERAn air gap
The vertical,physical separations,of an air gap, must be: - ANSWERAt least twice the diameter of the
water supply outlet,but never less than 1 inch
What is typical example of an air gap? - ANSWERKitchen sink
What is the maximum number of hours an AVB can have constant pressure? - ANSWER12 hours
License (100% Accurate!!)
Gear rotor model B - ANSWER
Spray with X nozzle - ANSWER
Spray with Y nozzle - ANSWER
Spray with Z nozzle - ANSWER
1" valve model Q - ANSWER
Backflow device - ANSWER
Mainline pipe - ANSWER
Laterals pipe - ANSWER
House service pipe - ANSWER
Sleeves - ANSWER
City main pipe - ANSWER
City meter - ANSWER
Controller - ANSWER
Legend - ANSWER
To convert psi to feet - ANSWERMultiply by 2.31
To convert feet to psi - ANSWERMultiply by 0.433 psi
Precipitation Rate Formula - ANSWERGPM (Full Circle Head) X 96.3
-------------- = PR
Head Spacing X Row Spacing (Divide)
Precipitation Rate for Drip - ANSWERGPH (one emitter) X 231
------------ = PR
Head Spacing (inches) X Row Spacing (inches)
Runtime Formula - ANSWERI x 60
RT ----=Runtime
PR
Calculating Drip Flow Zone - ANSWERTotal Linear feet of drip /emitter spacing x GPH of emitter/ 60 =
GPM for that zone
,Or DMDMD
Slope formula - ANSWERRise
S = -----------
Run
Triangular Head Spacing - ANSWERMultiply spacing by .866 to get row spacing
Efficiency of System - ANSWERExample if 50% efficiency with 1.12 Precipitation rate
Divide 1.12 by .50 to get 2.3/PR
Design Pressure - ANSWERDP = = Recommended head pressure + total losses
Actual Head Pressure - ANSWERAHP == Static Pressure - Total losses
D - DIVIDE - ANSWERTHE 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 - ANSWERTHIS STEP TELLS YOU HOW MANY TOTAL FEET...MULTIPLY THE TOTAL ROWS
BY THE LENGTH
D - DIVIDE - ANSWERTHIS STEP TELLS YOU HOW MANY TOTAL EMITTERS..DIVIDE THE TOTAL LENGTH
BY THE EMITTER SPACING IN FEET
M -MULTIPLY - ANSWERTHIS STEP TELLS YOU HOW MANY TOTAL GALLONS PER HOUR..MULTIPLY THE
TOTAL EMITTERS BY THE GPH GIVEN FOR EACH EMITTER
D - DIVIDE - ANSWERTHIS 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? - ANSWERBack pressure,back
siphonage,but its not suitable for high hazard applications.
Reduced Pressure Principle Backflow Preventer is suitable for? - ANSWERBack pressure,back
siphonage,and is good for high hazard applications.
Backflow - ANSWER. . 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? - ANSWERPvb,DCA,RP,and AVB
Which device can stop backpressure? - ANSWERDCA and RP
Which device can handle constant pressure? - ANSWERRP,DCA,and Pvb
The approved backflow devices for non-health hazards include: - ANSWERAll devices (AVB,PVB,DCA,
and RP)
Which device,or devices,are approved when there is chemical applied by aspiration,injection,or
emission? - ANSWERRP
If there is an on-site sewage facility on site, which backflow is approved? - ANSWERRP
, If major Maintenance has to be performed,which backflow device has to be properly installed prior
to the repair work being performed? - ANSWERAn approved backflow device
If including a master valve,where does it have to be installed? - ANSWERDownstream from the
PVB,DCA,or RP
Which devices have to be tested upon installation and annually? - ANSWERDevices used in
applications designated as health hazards
Which backflow device has to be tested upon installation? - ANSWERAll Backflow devices
If a DCA is installed below ground,what device is required? - ANSWERA 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 ? - ANSWERRP
What device cannot be used when there is health hazard? - ANSWERDCA
An AVB and PVB can be used in health hazard situations,if the following conditions are not present: -
ANSWERBackpressure,There is pump downstream,Chemicals added
An Atmospheric Vacuum Breaker - ANSWERHas to be installed 6'' higher than the highest head or
outlet in the retracted position,will not handle constant pressure,and will stop backsiphonage
What is the unwanted reversal of water flow in an irrigation system? - ANSWERBackflow
A cross connection is any actual or potential connection between a potable water supply and: -
ANSWERAny source that has the possibility to introduce polluted or contaminated water back into
the potable water that is supplying it
Backsiphonage is caused by? - ANSWERNegative or sub-atmospheric pressure
Backsiphonage can be caused by: - ANSWERA break in the City Main or
The fire department using water from the city fire hydrant to put out a fire..
If the pressure in the sprinkler system(or downstream side)exceeds the pressure in the supply
side,what phenomenon can occur? - ANSWERBackpressure
What can cause backpressure ? - ANSWERGravity or a pump
How many total ways are there to protect against backpressure and/or backsiphonage? - ANSWER5
total
What is the unobstructed vertical distance through free atmosphere between the lowest point of a
water supply outlet and the flood level rim of the fixture or assembly into which the outlet
discharges? - ANSWERAn air gap
The vertical,physical separations,of an air gap, must be: - ANSWERAt least twice the diameter of the
water supply outlet,but never less than 1 inch
What is typical example of an air gap? - ANSWERKitchen sink
What is the maximum number of hours an AVB can have constant pressure? - ANSWER12 hours
