Texas Irrigation Exam (2023 – 2024) Questions and Answers Rated A+, Exams of Advanced Education

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Texas Irrigation Exam (2023 – 2024) Questions

and Answers Rated A+

How often does a licensed irrigator need to renew his license? - once every three years Which is /are the strategic goal/goals of TCEQ? - 1 - enforcement 2 - water quality 3 - waste management Individual responsible for obtaining permits and inspections? - Licensed Irrigador When is it acceptable for a licensed technician to alter the irrigation design? - when the technician receives approval from the license Irrigador The term Commission , refers to? - Texas commission of environmental quality. How many members make up the Texas Irrigador's advisory council? - 9 members Members of Texas Irrigador's advisory council are appointed by? - Texas commission of environmental quality. How many members of the Texas Irrigador's advisory council must be representatives of the public? - 3 members Which is the function of an irrigation system? - erosion control dust reduction irrigating any type of landscape vegetation in any location After a license has expired, the only way to obtain another one is to? - go through the re-examination process again. You must be licensed or work under the supervision of a licensed individual in order to install or repair irrigation systems for a living. - true What will happen if an irrigador fails to receive written notice from the TCEQ that his license is about to expire? - The irrigador will lose the license if they fail to renew even if the TCEQ does not send a written notice.? What is the minimum depth of pipe coverage.? - 6 inches Absorption rate is also known as? - infiltration rate

An atmospheric vacuum breaker is commonly referred to as an? - anti-siphon Statement about control wires - The larger the gauge number, the smaller the wire Design pressure = - Recommended head pressure + total losses Actual head pressure is = - Static pressure _ Total losses Term used when all heads discharge varying amounts of water , combining to produce uniform coverage? - match precipitation AWWA is an abbreviation for? - American Water Works Association A valve permitting water to flow in one direction? - check valve One complete operation of a controller through all programmed stations? - cycle Minimum pressure required for a system to operate properly? - Design pressure Type of damage occurring when water travels unrestricted though empty lateral lines? - dry line shock Device which allows water to flow out slowly in a drip irrigation system? - Emitter When water flows through piping , pressure is lost as a result of? - friction As a general guideline ,the design pressure should not exceed? - — of the static pressure - 10% Generally, sleeves should be at least _____larger than the irrigation piping required. - 2 sizes PVC pipe with the same physical dimension as iron pipe? - Schedule pipe The process of plant material giving off vapor from the leaves? - Transpiration Shock wave created by a fast closing valve? - Water hammer Act of chemically fusing PVC pipe and fittings together? - solvent welding PVC is an abbreviation for? - Polyvinyl Chloride Flexible part of an automatic valve which regulates the passage of water? - Diaphragm What does I.P.S. stand for? - Iron plastic size

What does M.I.P. stand for? - male iron pipe An irrigation system with any kind of injection device associated with it would be termed as ____? - Health Hazard Which back flow device is required to be used with pumps? - Which ever one is required by state or local codes. The mechanical prevention of reverse flow, or back siphonage , of non-potable water from an irrigation system into the public water system is called? - 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? - Back pressure Which back flow device is most recommended for systems with fertilizer injectors? - Reduced pressure principle Which back flow device is recommended for low hazard applications? - atmospheric vacuum breaker pressure vacuum breaker double check assembly reduced pressure principle all of them. Which back flow device can be installed below grade? - Double check assembly Which back flow device can be under constant pressure? - Pressure vacuum breaker Double check assembly Reduced pressure principle Which back flow device is acceptable to use when there is a possibility of back pressure? - Double check assembly Reduced pressure principle Which back flow device is recommended to prevent back siphonage? - AVB PVB DCA RPZ An atmospheric vacuum breaker is not suitable for__? - Back pressure statement correct>>> - A pressure vacuum breaker, unlike the admospheric vacuum breaker, will operate satisfactorily under constant pressure.

Back flow in the water distribution system can be caused by: - Back pressure and Back siphonage A pressure vacuum breaker may be installed with a : - Control valve immediately downstream Back prevention assemblies on high hazard systems should be repaired : - When field test results show failure A control valve downstream a back flow device may result in : - Constant pressure Where are the shut- offs valves located on an ABV? - There are no shut - off valves How many test cock are on a DCA? - 4 test cocks What will happen if an AVB is installed in the wrong direction? - Water will escape through the top portion of the device Which backflow device will protect against high hazard and back pressure? - Reduced pressure principle An atmospheric vacuum breaker must be installed ___ inches above the highest water outlet. - 6 inches A reduced pressure principle device must be installed _____? - 12 inches above grade A dual check valve is approved to protect against.? - none of them What determines which backflow device you install.? - Degree of hazard If water hammer is a problem, then a PBV may be used. - A PVB can not protect against water hammer. Which has the highest precipitation rate? - Spray heads. Which head spacing would provide the highest precipitation rate for any given property? - Triangular head spacing Precipitation rates from most spray heads _____? - Exceeds the infiltration rate of most tight soils. Which soil type would hold the most water? - Clay The following would affect the precipitation rate of rotary heads? - erratic head spacing

head pressure nozzle size which most rotary heads , if you adjust the arc down (for instance , from 360 to 180 degrees ), the precipitation rate ______. - increases with most rotary heads, if you adjust the arc down the discharge rate _____. - remains the same. Rotary heads precipitate water more rapidly than any other types of heads. - False irrigation heads should be selected _________. - To apply water equal to or slightly below the infiltration rate of soil. Frequent watering will result in _______. - A shallow root system. Which is not ideal for dissolving surface fertilizer? - subsurface drip What is essential to prevent emitters from clogging. - Filters Why is it never acceptable to run drip lines and spray heads on the same zone valve?

• Because their precipitation rates vary. the licensed irrigator should base his design on _____. - Average nighttime wind speeds Which piping of a sprinkler system will be under constant pressure.? - Main line A gate valve will have________. - Lees pressure loss than a globe valve of equal size. schedule 40 fittings can be solvent welded to: - schedule 40 pipe class pipe schedule 80 pipe
• all the above. Potable water is______? - suitable for human consumption statement about "C" value. - The lower the "C" value the greater the friction loss. The main factor that affects the effectiveness of a sprinkler system is _____. - Precipitation rate Conventional spray heads discharge a spray pattern that usually_____ in in shape. - Circular Which would be affected more adversely by wind? - Stretched head spacing.

A well designed rotary system can be just as efficient as a well designed system with spray heads. - True Resistant to UV light. - Polyethylene tubing. Electric valves are classified as ______. - Normally closed valves. The wire to the valve should be pulled fairly tight to prevent the wire from moving in the ditch. - False Which wire is larger? 18 gauge 14 gauge 16 gauge 12 gauge - 12 gauge Multi-conductor wire such as 18/6 has______. - 5 circuit wires and 1 common. Master valves are used to prevent velocities above 7ft/sec. - False Any connection made to a potable water supply. - Cross connection. Water has higher infiltration rates in: - Course, sandy soils The best measure of the amount of the water that needs to be replaced by the irrigation system is : - Evapotranspiration rate The basic reason drip irrigation is very successful for plant growth is: - Soil moisture content can be kept at a relative constant and proper level. The reason why drip is considered very water efficient and conserves water is: - Precise water placement and control. Less water lost to wind and evaporation. Which situation will cause the greatest evaporation? - Long run times. What type of emission device is used water confined areas ( like tree wells)? - Bubblers. Shrub heads on risers______. - Can be a hazard and should be placed against a wall or structure. Excessive water pressure for a sprinkler system. - __Is major cause of water waste because the heads perform poorly.

Will cause the water pattern to blow apart resulting in uneven distribution and smaller water droplets. Can shorten the operating life of the head. Never place rotary and spray heads on the same circuit because. - Precipitation rates vary greatly. As the wall thickness of PVC pipe increases, the inside diameter. - Decreases As wall thickness increases, the out side diameter.__ - Stays the same. In the case of 1" pipe, the 1" is? - The nominal size. Corrosion caused when two dissimilar metals come in contact with each other. - Electrolysis Which is not a designated type of copper tubing M K S L - S Which type of copper has the smallest inside diameter? - type "K" copper If the proposed pipe size for your irrigation system is 1" then the sleeves for this pipe needs to be at least_____. - 1 - 1/ PVC 2210 has a design burst strength of: - 2210 psi Class 315 pipe ______. - Has a working pressure rating of 315 psi A safe critical velocity for the water in PVC pipe is: - 5 ft /s Over sizing piping result in ______. - More expense Looping a main supply line in a sprinkler system can : - __Lower pressure loss to the circuits. __Allow you to use smaller pipe for the main line supply The main factor used to determine how to size down lateral line piping is ______. - Velocity.

If a system's head spacing is 15' then its row spacing should be __________ for triangular spacing. - 13' ft What happen if a gear driven rotary head is installed at an angle.? - The spray patter will be distorted and it will have a poor distribution of water. What happens if the rotation of the rotary head is too fast? - The radius will decrease. Changing out the size of the nozzle on a rotary head will also change___. - __GPM of the head __Radius of throw An increase in the head pressure will ______. - increase flow rate. When is a door not a door? - When it is ajar. As the average wind speed increases,______. - The head spacing should be increased If you double the flow of water through of your piping, the pressure loss will be______.

• 4 times greater. Where is the precipitation rate of a spray head the greatest.? - Closest to the head. The weight of a 1" tall column of water consist of 12 cubic inches is ______? - 0.433 lbs