Texas Irrigator License Exam practice
test 2023 Questions and Answers 100%
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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)
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
,What is the unwanted reversal of water flow in an irrigation system? - Backflow
A cross connection is any actual or potential connection between a potable water supply
and: - Any source that has the possibility to introduce polluted or contaminated water
back into the potable water that is supplying it
Backsiphonage is caused by? - Negative or sub-atmospheric pressure
Backsiphonage can be caused by: - A 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? - Backpressure
What can cause backpressure ? - Gravity or a pump
How many total ways are there to protect against backpressure and/or backsiphonage?
- 5 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? - An air gap
The vertical,physical separations,of an air gap, must be: - At least twice the diameter of
the water supply outlet,but never less than 1 inch
What is typical example of an air gap? - Kitchen sink
What is the maximum number of hours an AVB can have constant pressure? - 12 hours
How high does a pressure vacuum breaker have to be installed? - 12" above the
highest head or outlet in the retracted position
How many test cocks does a PVB,DCA,and RP have,respectively? - 2, 4 and 4
If the highest head at the site is a shrub spray on a 12" riser,how high would a PVB
have to be installed if right next to that head? - 24" inches
Which backflow devices incorporate two check valves? - DC,RP
Which backflow device can be installed below grade(local regulation permitting)? - DC
How many test cocks are there on a DCA,RP,PVB,and AVB,respectively? - 4, 4, 2, and
0
, Which backflow device uses a pressure differential relief valve and has to be installed
12" above grade? - RP
There are two ball valves on which of the following? - DC,RP
The phenomenon that causes water to backflow due to elevation or a pump is called: -
BackPressure
A properly designed irrigation system can: - Save water,time,and money
When calculating the available water capacity of an irrigation site,irrigators refer to that
amount in: - GPM
When using drip irrigation,the water volume of individual drip emitters is generally
expressed in: - GPH
If the plant watering requirement is .5 for a week,precipitation rate is .75,how many
minutes of watering will be needed per week? - .5 divided .75 x60=40minutes per week
The science of applying the required amount of water to promote or maintain the
healthy growth of plant material or turf is: - Landscape irrigation
What is required upon completion of an irrigation? - Final walkthru,,
Maintenance checklist, A permanent sticker affixed to the controller,An as-built
plan...ALL OF THE ABOVE
Upon completion of an irrigation system,the irrigation contractor must furnish the owner
with: - A written warranty covering materials and labor
When two,or more,valves are located in the same location or valve box,it is referred to
as: - A Manifold
The TECQ refers to: - Texas Commission on Environmental Quality
A licenced irrigator can: - Sell,design,consult regarding
installs,maintenance,alterations,repairs,services
What more can a licensed irrigator do than a licensed technician? - Sell,design,and
consult
Sprinkler heads cannot be placed closer to the hardscape than: - 4 inches
What is the minimum distance of turf(between the street and the side walk)that you can
use above-ground spray emmission devices: - 48 inches
