Texas Irrigator License 2024 - 2025 Final Exam Review, Exams of Water and Wastewater Engineering

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Texas Irrigator License

2024 - 2025 Final Exam Review Questions

and Answers 100%Pass

David Mungai [Date] [Course title]

Texas Irrigator License 2024 - 2025

Final Exam Review Questions and

Answers 100%Pass

A licensed irrigator must renew his/her every ______ years. - Answer>> three ________, _________, and _________ are the goals of the TCEQ. - Answer>> Enforcement, Water Quality, Waste management Licensed ______ are responsible for obtaining permits and inspections. - Answer>> irrigators _______________ can install an irrigation system - Answer>> Both ( Licensed Irrigator and Technician ) A TECHNICIAN can alter the irrigation design only when he/she ___________. - Answer>> receives approval from the licensed irrigator The "Commission" refers to _______ - Answer>> Texas Commission on Environmental Quality (TCEQ) The Texas Irrigator's Advisory Council is made up of __ members

• Answer>> nine The members of the Texas Irrigator's Advisory Council are appointed by _________. - Answer>> the Texas Commission on Environmental Quality (TCEQ)

The "Rules and Regulations for licensed Irrigators" as presented but he TCEQ states that a design of the proposed irrigation system must be provided to the home owner once the jib has been completed. - Answer>> TRUE On all installations of new irrigation systems, a licensed irrigator must present the customer a written statement of guarantees for materials and labor furnished in the installation of the system - Answer>> TRUE According to the "Rules and Regulations for Licensed Irrigators" an irrigation system MUST be designed and installed in a manner that promotes water conservation. - Answer>> TRUE Absorption Rate is also known as ______. - Answer>> infiltration rate An atmospheric Vacuum breaker id commonly referred as an ______ - Answer>> anti-siphon The larger the gauge number, - Answer>> Smaller the diameter of the wire __________ ___________ is when all the heads discharge varying amounts of water, combining to produce uniform coverage - Answer>> Matched Precipitation Static Pressure - All pressure losses = - Answer>> Dynamic Head Pressure AWWA - Answer>> American Water Works Association A _______ is valve that permits water to flow in one direction only

• Answer>> CHECK valve

A ______ is one complete operation of a controller through all programed stations - Answer>> CIRCUIT ______ pressure is the minimus pressure required for a system to operate properly - Answer>> DESIGN __________ is a type of damage occurring when water travels unrestricted through empty lateral lines - Answer>> DRY LINE SHOCKED AND APPALLED An ________ is a device which allows water to flow out slowly in a drip irrigation system - Answer>> EMITTER Emitters use _____ to measure precipitation rate - Answer>> GAL PRE HOUR (GPH) Spray heads use ___ to measure precipitation rate - Answer>> GAL PER MIN (GPM) Pressure is lost as water moves through the piping is a result of _________ - Answer>> FRICTION The design pressure should not exceed ________ of the static pressure - Answer>> 90% Sleeves should be at least ______ larger than the irrigation piping required - Answer>> two sizes PVC pipe with the same physical dimensions as iron pipe. - Answer>> SCHEDULE PIPE ________ is the process of plant material giving off water vapor from their leaves - Answer>> TRANSPIRATION

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 _________ - Answer>> Back Pressure _____________ is most recommended for system with fertilizer injectors - Answer>> Reduced Pressure Principle For low hazard applications, ________ is recommended - Answer>> ANY BACK FLOW DEVICE The ________________. can be installed below grade ( ground level ) - Answer>> Double Check Valve Assembly _________, ___________, and ___________ can be under constant pressure - Answer>> Pressure Vacuum Breaker, Double Check Valve Assembly, Reduced Pressure Principle ________ and _______ are acceptable back flow devices where there is a possibility of back pressure - Answer>> Double Check Valve Assembly, Reduced Pressure Principle __________, __________, and _________ are back flow devices recommended to prevent back siphonage - Answer>> Atmospheric Vacuum Breaker, Pressure Vacuum Breaker, Double Check Valve Assembly An atmospheric vacuum breaker is not suitable for ___________

• Answer>> Back Pressure

A pressure vacuum breaker, unlike the atmospheric vacuum breaker,_________ - Answer>> will operate satisfactory under constant pressure Back flow in the water distribution system can be caused by ________ and _________ - Answer>> Back Pressure and Back Siphonage A pressure vacuum breaker may be installed with a ___________

• Answer>> control valve immediately downstream Back flow prevention assemblies on high hazard systems should be repaired ____________ - Answer>> when field test results show failure A control valve downstream a back flow device may result in ________ - Answer>> Constant Pressure Where are shut off valves located on an AVB? - Answer>> There are no shut-off valves A D.C.A. has ___ test cocks - Answer>> FOUR If the AVB is installed in the wrong direction, ____________ - Answer>> water will escape through the top portion of the device _________________ back flow device will protect against high hazard and back pressure - Answer>> Reduced Pressure Zone An atmospheric vacuum breaker must be installed _____ inches above the highest water outlet (spray head, emitters, etc) - Answer>> SIX

With most rotary heads, if you adjust the arc down, the discharge rate ___________ - Answer>> remains the same Rotary heads precipitate water more rapidly than other types of heads - Answer>> FALSE Irrigation heads should be selected ________ - Answer>> To apply water equal to or slightly below the infiltration rate of the soil. Frequent watering will result in ______ - Answer>> a shallow root system ______ ________ is not ideal for dissolving surface fertilizer - Answer>> Subsurface Drip ________ are essential to prevent emitters from clogging - Answer>> FILTERS It is never acceptable to run drip Lins and spray heads on the same valves, - Answer>> because their precipitation rates vary The licensed irrigator should base his/her design on __________

• Answer>> average nighttime wind speeds The _____ ____ is the part of a sprinkler system that will be under constant pressure - Answer>> MAIN LINE A gate valve will have _________ - Answer>> Less pressure loss than a globe valve of equal size Schedule 40 fittings can be solvent welded to: - Answer>> Schedule 40 pipe, Class Pipe,

schedule 80 pipe, Potable water is _____ - Answer>> water that suitable for human consumption the "C" valve - Answer>> The lower the "C" valve, the greater the friction loss The main design factor that affects the effectiveness of a sprinkler system is __________ - Answer>> PRECIPITATION RATE Conventional spray heads discharge a spray pattern that is usually ______ in shape - Answer>> CIRCULAR __________ _________ __________ would be most affected by adverse wind - Answer>> ROTARY TYPE HEADS A well designed rotary system can be just as efficient as a well designed system with spray heads - Answer>> TRUE _________ _________ is resistant to UV light - Answer>> polythylene tubing Electric Valves are classified as - Answer>> NORMALLY CLOSED The wire to a valve should always be pulled fairly tight to prevent the wire from moving in the ditch - Answer>> FALSE Which wire is larger? 18 gauge 14 gauge 16 gauge 12 gauge - Answer>> 12 Gauge;

shrub heads on risers __________ - Answer>> can be a hazard and should be placed against a wall or structure Excessive water pressure for a sprinkler system - Answer>> Can shorten the operating life of the heads, uneven distribution of water, major cause for water waste Never place rotary and spray heads on the same circuit because _______ - Answer>> their precipitation rates vary greatly As the wall thickness of a pipe increases the inside diameter - Answer>> decreases As the wall thickness of a pipe increases the outside diameter - Answer>> stays the same In the case of 1" pipe, the 1" is - Answer>> the nominal size Corrosion caused when two dissimilar metals come in contact with each other is ________ - Answer>> ELECTROLYSIS Which is not a designated type of copper tubing? M K S L - Answer>> S Which of the following would have the smallest inside diameter? 1" type "K" copper 1" type "M" copper 1" type "L" copper - Answer>> 1" type "K" copper

If the pipe is 1", then the sleeve should be at least _____ " - Answer>> 1 1/2" PVC 2210 has a design burst strength of - Answer>> 1000 psi Class 315 pipe - Answer>> has a working pressure rating of 315 psi A safe critical velocity for the water in PVC pipe is. - Answer>> 5 ft/s Oversizing piping results in _______ - Answer>> More expense Looping a main supply line in sprinkler system can. - Answer>> Lower pressure loss to the circuits and Allow you to use smaller pipe for the main supply line The main factor used to determine how to size down lateral line piping is _________- - Answer>> PRESSURE AND VELOCITY If a system's head spacing is 15', then its row spacing should be _____ for TRIANGULAR spacing - Answer>> 13' If a gear driven rotary head is installed at an angle, - Answer>> the spray pattern will be distorted and it will have a poor distribution of water If the rotation of a rotary head is too fast, - Answer>> the radius will decrease Changing out the size of the nozzle on a rotary head will also change _______ - Answer>> GPM of the head and Radius of throw

Feet to PSI - Answer>> FT *. PSI to FT - Answer>> PSI /. Triangular head spacing. - Answer>> Head Spacing * .866 = row spacing Design Pressure - Answer>> Recommended Head Pressure + Total Losses Actual Head Pressure - Answer>> Static Pressure - Total Losses Atmospheric Vacuum Breaker (AVB) - Answer>> Back Siphonage, Low Hazard, High Hazard 6" above highest outlet, Vertical Pressure Vacuum Breaker (PVB) - Answer>> Back Siphonage, Constant Pressure, Low Hazard, High Hazard 12" above highest outlet, 2 test cocks, 2 shut-offs Double Check Valve Assembly (DCVA) - Answer>> Back Siphonage, Back Pressure, Constant Pressure, Low Hazard, Below Grade,

Vertical/Horizontal, 4 Test Cocks, 2 Shut-offs, Y-Type on inlet side Reduced Pressure Zone Backflow Preventer - Answer>> Back Siphonage, Back Pressure, Constant Pressure, Low Hazard, High Hazard, 12" above Grade, Horizontal, 4 Test Cocks, 2 Shut-offs Must be used when chemicals are involved