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

Download Texas Irrigator License 2024 - 2025 Final Exam Review and more Exams Water and Wastewater Engineering in PDF only on Docsity!

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 Texas Irrigator's Advisory Council must have ___ representatives of the public - Answer>> THREE A minimum depth of ____ inches of pipe coverage is needed - Answer>> NINE ______, _______, and ______ are functions of an irrigation system - Answer>> Erosion control, Dust reduction, Irrigation of vegetation After a license has expired, the only way to obtain another is to __________. - Answer>> go through the re-examination process again. Even if TCEQ fails to remind you that your license is about to expire, _______ - Answer>> you will still lose your licence if you fail to renew. You must be licensed or work under the supervision of a licensed individual in order to install or repair irrigation system for a living - Answer>> TRUE In order to renew an irrigator license you must pay a renewal fee and complete at least 16 hours of agency approved continuing education credits - Answer>> FALSE, at least 24 hours If continuing education credits are not completed before the license'd renewal date, the irrigator will ______ - Answer>> lose their license. A complaint can be filed over the phone if accurate records are taken - Answer>> FALSE

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

A shock wave of water created by a fast closing valve is called _______ - Answer>> Water Hammer How do you denote the "Designation Code" for PVC pipe - Answer>> Type# + Grade# + psi/ ([ex] PVC pipe Type One, Grade Two, 2000 psi DP =

The act of chemically fusing PVC pipe and fittings together is called - Answer>> Solvent Welding PVC stands for - Answer>> polyvinyl chloride The _________ is the flexible part of an automatic valve which regulates the passage of water - Answer>> DIAPHRAGM I.P.S. stands for - Answer>> Iron Pipe Size MIP stands for - Answer>> Male Iron Pipe An irrigation system with any kind of injection device associated with it would be referred as _____ - Answer>> Heath Hazard A __________ back flow device is required to be used with pumps - Answer>> (Which ever the state or local codes team required) The mechanical prevention of reverse flow, or back siphonage, of non-potable water from an irrigation system into the public water system is called_______ - Answer>> Back Flow Prevention

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

A reduced pressure principle device must be installed ____ - Answer>> twelve inches above ground level (grade) A dual check valve is approved to protect against - Answer>> NOTHING, dual check isn't a thing, Double check is _______ determines which back flow device you install - Answer>> Degree of Hazard If water hammer is a problem, then a PVB may be used if _________ - Answer>> a PVB cannot protect against water hammer _______ ______ have the highest precipitation rate - Answer>> SPRAY HEADS _______ ________ ________ would provide the highest precipitation rate for any given property - Answer>> Triangular Head Spacing Precipitation rates from most spray heads _____________ - Answer>> exceeds the infiltration rate in most tight soils ________ soil holds the most water - Answer>> CLAY _______, _________, and _______ affect the precipitation rate of a rotary head - Answer>> Erratic Head Spacing, Nozzle Size, Head Pressure With most rotary heads, if you adjust the arc down (for instance, from 360° to 180°), precipitation rate _________ - Answer>> INCREASES

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;

the smaller the gauge number the larger the wire Multi-conductor wire such as 18/6 has ______ - Answer>> 18 circuit wires and 6 common Master valves are used to prevent velocities above 7ft/sec. - Answer>> FALSE Any connection made to a potable water supply. - Answer>> cross connection Water has a higher infiltration rate in __________ - Answer>> COURSE, SANDY SOIL The best measure of the amount of water the needs to be replaced by the irrigation system is ______ - Answer>> evapotranspiration rate The basic reason for drip irrigation is very successful for plant growth is _____ - Answer>> soil moisture content can be kept at a relative constant and proper level The reasons why drip is considered very water efficient and conserves water is that _____ - Answer>> it is precise in water placement and control and less water is lost to wind and evaporation ____ ____ _____ cause for the greatest evaporation - Answer>> LONG RUN TIMES ___________ are emission devices used in confined area, like tree wells - Answer>> MINI-SPRINKLERS

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

(flow and throw) An increase in head pressure will_______ - Answer>> increase flow rate As the average wind speed increase, - Answer>> the head spacing should be decreased If you double the flow of water through your piping, the pressure loss will be ____________ - Answer>> 4 times greater The precipitation rate is greatest ___________________ - Answer>> closest to the head The weight of a 1' tall column of water consisting of 12 cubic inches is ____________ - Answer>> 0.433 lbs (1 ft^2 = .433 lbs) Precipitation Rate Formula - Answer>> ( GPM(full head) * 96.3 )

---

HeadSpacing * RowSpacing Precipitation Rate for Drip - Answer>> GPH (one emitter) * 231

---

HeadSpacing * RowSpacing (inches) Runtime Formula - Answer>> Inches Needed * 60 (min)

---

Precipitation Rate Slope Formula - Answer>> rise/run

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