CR-21 Landscapes and Irrigation Practice Test

These questions are part of the practice quiz. Start practicing

• What is the maximum height above grade of a wooden deck that a CR-21 Licensee may build?
• An R-21 license could be used for which of the following?
• Placement of emitters should avoid direct contact with which parts of the plant?
• Why is buried irrigation wiring usually not placed inside conduit?
• What term describes the point of convergence where bedlines meet at a corner, suitable for placing a focal feature?
• Which side of a cactus develops a thicker tougher skin due to sun exposure?
• Wood framing clearance required where a masonry chimney passes through the roof opening is how many inches?
• When is it okay to use low point drains on a mainline?
• Brick is laid on concrete foundations. The first bed of mortar joint shall be what maximum thickness?
• Which fertilizer analysis is best for use in the desert?
• Before grading, which site condition should be checked to prevent drainage problems?
• What component delivers water slowly to the root zone in drip irrigation?
• In landscaping, the water drainage should be directed away from which structures?
• What is a GFI used for in electrical safety?
• For aerating compacted grass soil, which material blend is most effective?
• What are 3 factors for a contractor to consider before deciding to install pavers?
• Which statement best describes pruning?
• The ends of hem-fir wood girders entering exterior masonry walls shall be provided with a minimum _____ inch air space on tops, sides, and ends.
• What tool should be used immediately after strikeoff to eliminate high and low spots and embed large aggregate particles?
• What percentage of the root zone should be wetted to provide the benefits of irrigation?
• What essential equipment is needed to assemble decorative metal fence panels?
• Where should a 6-mil polyethylene vapor retarder be placed to retard vapor transmission through the floor slab?
• Which of the following is an approved method for connecting corrugated metal pipe?
• What is one effect of a pressure regulator in an irrigation system?
• According to OSHA, what type of evacuation plan is needed for an employer with 10 or fewer employees?
• In paver installations, tension bands are commonly spaced at what distance?
• Which color marks sanitary sewer systems?
• If hot dipped galvanized nails are not available, which alternative is commonly used by professionals?
• Where should benchmarks be located on a grading site?
• What type of conduit is required to supply power to the electrical source on a water fixture?
• In the pipe stamp 2 inch SCH 40 PVC 1120 280 PSI at 23 degrees C ASTM D-1785 USPI NSF-PW, what is the pressure rating?
• Which nutrient is represented by the first number on a typical N-P-K fertilizer label?
• Under which condition are stepped footings required according to code?
• A transformer in the controller reduces the 120 volts to approximately 24 volts. What voltage is used to turn the valve on and off?
• How many cubic feet are in one cubic yard?
• What is the benefit of an as-built plan?
• How is total surge pressure calculated?
• When transplanting a tree, which practice best promotes survival?
• In masonry, what is the maximum size of a bed joint directly on the foundation?
• In a fertilizer labeled 23-6-3, which of the following correctly represents the components?
• Mortar is a mixture of which materials?
• How do you determine slope percentage?
• Which valve has the greatest tendency to wear out or break over time?
• To prevent salt buildup around plant wetting patterns, patterns should be ______.
• In the zone-by-zone flushing, what is done for the first riser closest to the valve?
• What is the recommended step to take when planning to grade a site to avoid drainage issues?
• For pond fabric sizing, the length is calculated using maximum length multiplied by which expression?
• After Blue Stake has marked facilities, how many working days are the markings good for?
• When should you backfill a trench?
• Using already grown grass as patches for a landscape describes which practice?
• Which action is a common contributor to water hammer in irrigation piping systems?
• What block is used to cap a block wall to give it a finished look?
• How soon after application of a herbicide should the tank be cleaned out?
• When installing an electrical (irrigation) pump, a circuit breaker (disconnect) must be installed within __________ feet of the pump
• How do you prevent erosion from a graded slope?
• Which tree with a mature height of 20 feet is best suited for landscaping in the southwest?
• How do you prevent winter heaving of ground cover?
• What is the maximum height difference between interlocking pavers?
• What is the maximum area, in square feet, that a brick veneer wall anchor tie is allowed to support?
• What is the mil rating of the vapor barrier that must be installed under a concrete slab?
• Which principle of landscaping design deals with the size of landscaping items?
• Contraction joints are designed to accommodate movements caused by which factors?
• How do you choose a weir?
• When using portland cement on an exterior, what is the proper ratio of cement to sand?
• Which of the following is an approved method for connecting corrugated metal pipe?
• Soils that are very tight (non porous) require which watering strategy?
• Which material is commonly used to provide drainage in a post hole installation?
• In sandy soil, the movement of water is?
• A chemical NOT used as a preservative for treating wood fencing is:
• What type of power tool requires upper and lower guards?
• For a 60-foot long chain-link fence, posts should be spaced at what distance?
• What is a primary advantage of drip irrigation compared to sprinklers?
• Which color best identifies the blue stake marking for potable water?
• Pump capacity is rated according to flow rate and dynamic head. Which type of head is specified in this rating?
• What is the purpose of Humus?
• What should be provided as a cover for the drain tile before installing the pond liner where a subdrain is used?
• A footing is 2 ft deep, 1 ft wide, and 40 ft long. What is the approximate volume in cubic yards?
• How much base is needed for a paver driveway?
• What penalty per violation may occur for noncompliance with underground facility identification requirements?
• How is transplant shock avoided?
• Which option is NOT a recommended time to water turf?
• What do you use to give a block wall a finished look?
• Which item is likely within the scope of the CR-21 license?
• If a lawn is needed immediately, which method should be used?
• When placing a culvert for drainage, what is the MINIMUM allowed slope?
• What color represents water systems in common utility color coding?
• What characteristic of a tree most affects erosion?
• As with blisters, delaminations can be repaired by patching or, if wide-spread, by grinding and overlaying with a new surface. Epoxy injection may also be beneficial in some applications. Which repair method is commonly used for delaminations?
• How often should you clamp the grounding wire to the fence wire on long fences?
• In pump terminology, what term describes the maximum height water can be raised by the pump?
• Which color marks Sanitary Sewer Systems in utility color coding?
• What color paint should be used to mark an excavation site before contacting Blue Stake?
• Which statement best describes the standard order of nutrients on fertilizer labels labeled N-P-K?
• Paving bricks are available in a range of colors and have no what?
• What causes a pop up riser to rise?
• In the fertilizer 23-6-4, which nutrient does the middle number represent?
• What is the primary benefit of an as-built plan?
• What is the minimum thickness of the scratch coat?
• A bright colored focal flower should be planted where in a planting plan?
• How high can a segmented wall be built?
• Dynamic total head is the sum of which dynamic components?
• What soil amendment increases the moisture retention capabilities of soil and provides organic material ultimately enriching the soil?
• The only way to improve the drainage of caliche soil is to break through it and remove the impermeable layer. The excavated soil can be replaced with a conditioned mix that will support healthy plant growth. What is the method described?
• What should be done with scrap wood that has nails in it?
• During transplanting, which soil condition yields faster root adaptation?
• Which irrigation type is the least expensive for covering a small area?
• What is a Cross Connection?
• Where is water placed in drip irrigation?
• According to OSHA, what type of guard (or safety) is required for a power saw?
• You have 2 BCY of sand, after compaction you will have?
• Where should a bright colored focal flower be planted in landscape design?
• What is the final step by the plasterer when finishing a sand finish coat?
• When cutting Bermuda grass, it should not be cut so that more than what fraction of the blade length is removed?
• Blue Stake uses orange to mark which of the following?
• When attaching the stretcher to the terminal post, how should you position the fabric loops and excess?
• Which masonry bond is typically backed with rigid steel ties due to its relatively weak bond strength?
• Decaying organic material creates which soil component?
• Which of the following is considered a xeriscaping plant?
• At the start of flushing, how should you backfill the irrigation lines?
• What is a GFI used for? (GFI - Ground Fault Interrupter Outlet)
• Which type of valve has the greatest tendency to wear out or break over time?
• What are the actual dimensions of surface dry 2" x 10" framed lumber?
• What is the maximum size of a bed joint in a masonry wall directly on the foundation?
• What is the most cost effective use of a Paver Cut?
• During trenching and excavation, OSHA requires that materials stored near the trench be at least how many feet from the trench?
• The method of planting grass that involves placing individual sections of rhizomes or stolon in rows of trenches in the ground and then covering with soil and packing is called:
• How long after concrete delivery should pouring occur?
• Which of the following species include both evergreen and deciduous varieties?
• According to the International Residential Code, what is the minimum depth of the filter material beneath the perforated line in a gray water trench?
• What is the standard bed joint thickness for typical masonry construction (not the starting course)?
• You use tension bands to fasten the tension bar to the end post. Use enough bands so they're spaced not more than a foot apart on the end post. Even on low fences, less than 4 feet high, use at least four bands for each bar. How many bands are recommended for each tension bar?
• Where would you plant flowers for a focal point?
• Among chemical fertilizers, which analysis is used most often for a southwestern garden?
• An as-built drawing is an invaluable tool for what purpose in irrigation projects?
• In chain-link fence spacing, the end-post spacing should be equal to the spacing between line posts.
• According to code, the minimum thickness for a concrete slab that is supported directly on the ground shall be _____ Inches.
• An Atmospheric Vacuum Breaker (AVB) includes which components to function?
• In very cold areas, post holes may need to be dug deeper to get below what?
• In irrigation design, what is a major benefit of a uniform water distribution pattern?
• What is the minimum sub base for a residential paver pathway?
• Who should determine the depth and width of a weir opening?
• Which block type is commonly used as the top course to cap a masonry wall?
• If you are going to leave the clippings of the cut grass, what length should you cut at?
• What is used for drainage in a post hole?
• The use of mulch on new plants does all except?
• What is the minimum length for taped joints on a 6-mil vapor retarder?
• In utility markings, red is used to indicate which utility?
• Transplant shock is avoided by using which method?
• Which is the most common voltage requirement for the operation of a typical irrigation sprinkler system remote control valve?
• To apply 4 pounds of actual nitrogen per 1,000 square feet using 20-10-5 fertilizer, how many pounds of fertilizer are required?
• For a well drained area, which slope option is considered acceptable for a brick walkway?
• What size rebar is used in a 6 foot tall block fence?
• The mortar joint having a vertical transverse plane is called which joint?
• What is the proper consistency of a concrete post hole mix?
• When installing a diagonal brace on a gate, the miter cuts should contact which parts of the gate?
• What is used when the main and lateral lines are placed at the same depth?
• When placing a culvert for drainage, what is the minimum allowable slope?
• What is the least costly lawn?
• Which statement accurately describes the relationship between valve count and electrical load in irrigation circuits?
• What is the expansion and compaction unit value used for sand in the material?
• Which backflow device is used when attaching an irrigation system to a chemical tank?
• A CR-21 licensee may build a decorative wall up to what height?
• For an irrigation sprinkler system with 30 volts, what burial depth is recommended?
• Which agency enforces the underground utilities marking law in Arizona?
• What is the minimum grade needed for proper drainage?
• What has to be done to caliche before plants can be installed?
• Adding dynamic suction lift and dynamic discharge head provides dynamic total head. Which option best represents this relationship?
• Which species include both evergreen and deciduous varieties?
• Where should a transformer with a photocell be installed?
• In absence of precise weir calculations, what is the recommended approach and why?
• A transformer in an irrigation controller reduces 120 volts to approximately 24 volts. Why is this voltage used for valves?
• What is the best season for planting native desert plant species?
• What effect does higher pressure have on wire size?
• Compared to sandy soil, water in clay soil tends to move?
• What safety feature is associated with operating irrigation valves at 24 volts?
• A hydro pneumatic storage tank that cycles the pump on and off is usually caused by which condition?
• If a chain link fence is 60 feet long, how far apart are the posts spaced?
• After applying and scoring the scratch coat of Portland cement mortar, what is the minimum time it should be set and cured?
• At what static pressure should a water-pressure reducing valve be installed in a building?
• Compared to type TW, type UF electrical wire has what characteristic?
• Xeriscaping emphasizes what primary goal?
• How far apart should bands be placed?
• What is the advantage of veneer plaster over conventional plaster?
• When transplanting a cactus, what should be done once the cactus is removed from the soil?
• In veneer plaster systems, which reinforcement material is recommended?
• To select pipe size, which information must be known?
• Pavers should be laid when?
• What is the maximum distance allowed for scaffolding from the wall during plastering?
• What is the maximum allowable bedjoint thickness between masonry units?
• Emitters can be placed so as to prevent salt damage by overlapping in the wetted area and completely covering the plant root zone. Where should they be placed?
• If the inlet port is blocked in a sprinkler valve, water cannot flow into which component?
• To prevent erosion or compaction in an area bearing heavy traffic, what measure is recommended?
• What additional steps are necessary for container grown plants?
• Which statement best describes a water shield?
• What color is used to mark an area for locating utilities prior to excavations?
• Which masonry bond is considered the weakest?
• When planting a tree, what is the best method to help insure its survival?
• Which would be best for aerating grass?
• On a long run over 100 feet from a low voltage transformer, what size wire would be best suitable?
• What is a 1/2 inch of accumulated organic material in a grassy area called?
• If eight square feet of brick veneer wall need to be supported by anchor ties, how many ties are required (each tie supports 2 square feet)?
• If a contractor is in willful violation of Arizona Blue Stake, what is the maximum fine?
• When should you seal the bottom of a wood fence panel?
• When is a good time to transplant according to common guidelines?
• What causes water hammer in a piping system?
• What type of tree would make a good focal point and screen?
• Drainage tile should be installed after grade is set and before soil has been conditioned. Which option describes the timing?
• Bare roots should be planted with what bottom hole shape?
• If you have multiple valves on a station an increase in wire size may be required because of _______.
• When should you seal the bottom of a piece of wood fencing?
• Before stacking used lumber, what must be done with the nails?
• A concrete slab should be bull floated as soon as possible after:
• In the color-coding scheme, Water Systems is indicated by which color?
• What is the approximate wattage for a single valve given 24 V and 0.15 A?
• In cold climates with freezing temperatures, water service pipe must be installed not less than how many inches deep and not less than how many inches below the frost line?
• A bushy, evergreen shrub with branches starting close to the ground is classified as?
• Control joints in a concrete block wall should be sealed with caulking compound after the mortar has been raked out to a depth of ____________.
• Which planting practice is commonly used for trees but not typically used for shrubs?
• What is the maximum allowable crack in an expansion joint?
• What process minimizes the need to haul heavy materials from the job site?
• What is used to hold blocks together in masonry?
• At what depth should the wire be buried for an irrigation sprinkler system with 30 volts?
• Why might you install a wood diagonal brace differently than a metal rod or wire on a gate?
• What color is designated for electric power distribution lines?
• A fence with round rails and posts where the rails are reduced to dowels are called?
• Which lawn establishment method is generally the least costly?
• Wall ties should be placed how far from the exposed edge of a masonry unit?
• On a power tool, when is it allowable to have a lock-on switch?
• Which planting method involves placing rhizomes or stolons in trenches and then packing soil?
• Before finish-coat application of Portland cement plaster, the base coat should be _____?
• The ends of wall ties shall be embedded in mortar joints with not less than how much mortar coverage from the exposed face?
• What is the minimum distance between the top of the sewer line and the bottom of a water line where they cross?
• If street pressure is 40 psi and 12 psi is lost to friction, the remaining pressure can be expressed as feet of head. What is the head in feet of water from the remaining pressure (28 psi)?
• Bare roots should be planted in:
• How should post holes be dug to properly accommodate posts?
• What is the defining characteristic of a perimeter wall?
• When plastering, how far from the face can scaffolding be?
• How wide should the footer be for a CMU wall?
• Gas piping embedded in concrete and exposed to moisture must be which of the following?
• Which cleaning method carries a risk of mortar smear or acid burn if not used properly?
• What is done before grading?
• When plastering, what is the maximum distance allowed between scaffolding and the wall?
• Efflorescence on masonry walls occurs when moisture moves salts to the surface; which term describes this white deposit?
• When a specific depth of soil is removed on a site, what is this called?
• What is the minimum air space clearance to combustibles for a masonry chimney located inside the building or within the exterior wall?
• Which connector is used to join PVC pipe with PE drip tubing?
• What is the MAXIMUM distance between expansion joints of a 6 foot masonry wall 50 feet long?
• How are decorative metal fence panels typically joined?
• Why should you avoid adding water to colored finish-coat plaster before it hardens?
• Most pressure type vacuum breakers are installed at what minimum distance above the highest outlet?
• How does a contractor know to fill a trench to a certain grade?
• A CR-21 licensee may install residential misting systems under what PSI?
• How long should you wait before setting the second course on the base?
• What is a water shield?
• Backfill depth for trenches that are overexcavated and require backfilling below the level of the pipe is limited to how many inches per layer?
• Which finish is best used when subject to regular dampness?
• What is the best season for planting native desert plant species?
• Expansion joints in concrete are designed to accommodate movement caused by which factor?
• How long before digging should you notify the local marking company?
• Under what condition is it acceptable to use low point drains on a main line?
• In the VIH sprinkler system, are the valves normally open or closed?
• Which tool requires top and bottom shielding?
• What type of backflow prevention is used between the sprinkler and circuit valve?
• Unit ties are generally placed at what spacing?
• Which method is an approved technique for corrugated metal pipe connections?
• How should wood bracing be attached on a gate?
• When installing a diagonal brace on a wooden gate, where should the lower end be located?
• When should bulbs be fertilized with a high phosphorus fertilizer such as bone meal?
• What soil amendment is a high phosphorus fertilizer used in flower beds containing bulb plants?
• What is the objective of laying stone in a paved area?
• Which type of nail resists rust and provides strong holding power for fence construction?
• What backflow device is used when effluent is used in the irrigation system?
• Failing to notify Blue Stake prior to excavation may subject a contractor to damages and a fine of how much?
• Which color marks water systems according to standard utility markings?
• How many feet of head does 1 psi correspond to?
• Which type of joint reinforcement should be used in a veneer plaster system?
• How long must you wait before setting the second course on the base?
• The curing of concrete continues as long as its relative humidity remains above which percentage?
• Which fence style best describes a fence with rails reduced to dowels?
• What is the purpose of adding expansion joints at regular intervals in long walls?
• If you start with 3 BCY of sand, after compaction using a factor of 0.98, what is the compacted volume in CCY?
• All of the following are reasons for pruning plants except to:
• In the first year after planting a conifer tree, which practice would you NOT do?
• How far from a marked facility should you dig with hand tools?
• On concrete delivery time, how long do you have before concrete should be poured?
• Which spray head covers a smaller area?
• In the construction of a pond, what is the function of a weir?
• Mulching new plants provides all of the following benefits except?
• What is the maximum allowable slope in an area to be planted with ground cover and shrubs?
• Why is 'holding current' important in irrigation?
• Which soil amendment increases moisture retention and provides organic material to enrich the soil?
• Which statement best describes voltage drop in a long low-voltage line?
• How many atmospheric vacuum breakers are needed per irrigation circuit?
• If trenching near utilities is unsafe for a machine, what is the recommended method for digging?
• When can you use a drain valve in main and lateral pipes for winter drainage?
• Chain link fence is sold in 50 ft rolls. If the fence length is 395 ft and you have pre-hung gates, how many rolls are required?
• Which nozzle option is associated with minimizing runoff on non-sodded banks?
• Which color marks water systems in utility marking color codes?
• What is a fixed reference point called in surveying?
• Which planting technique is used for trees but not normally used when planting shrubs?
• How much clearance is required for the wood framing where a masonry chimney passes through a roof opening?
• Where should a transformer with a photocell be installed?
• If soil has a high pH, which amendment should be added?
• How should the trowel be held against the wall when plastering with Portland cement used for exterior application?
• In a fertilizer labeled 23-6-4, what nutrients do the numbers represent in order?
• Which element in fertilizer governs the growth rate and the green color of grass?
• A footing for a fence is 2 feet deep, 1 foot wide and 40 feet in length. How many cubic yards of concrete are needed?
• Which is best to use when laying a course of brick?
• What determines the pattern and quantity of a water spray head?
• What is considered a good time to transplant plants?
• Stays on wire mesh fencing are used to ______.
• What determines the quantity of water flowing in a pipe?
• In landscape design, where is the natural focal point placed?
• Which type of reinforcement should be used in a veneer plaster system?
• In sandy soil the movement of water is ___________.
• What is the name of an underground stem on a grass plant that sprouts into a new grass plant?
• What is the proper consistency of a concrete post hole mix?
• Water levels in a pressure tank rise due to which of the following factors?
• What height should the above-ground concrete around a fence post be raised to?
• Under the HARDSCAPING AND IRRIGATION SYSTEMS classification, decorative garden walls up to six feet from finish grade may be installed or repaired. Which classification is this?
• Placement of emitters should avoid direct contact with which part of the plant?
• When should a cactus be watered after transplant?
• Trenches that are overexcavated and require backfilling below the level of the pipe shall be backfilled in layers not exceeding how many inches?
• What is the minimum concrete slab thickness on grade according to code?
• OSHA record-keeping applies to employers with _____ or more employees.
• How many volts are needed to run a low-voltage transformer?
• What procedure should be used to install a flagstone patio?
• If no concrete is used, how deep should a post be placed in the ground?
• A masonry pattern with all vertical joints aligned is called which bond?
• What is the most common method to remove efflorescence from block walls?
• What does the color ORANGE mean in utility marking?
• What is the minimum safety equipment according to OSHA?
• How can you fix overworked concrete?
• If precise weir calculations are not available, what is recommended?
• What is the spacing for metal joint bracing of a masonry wall?
• What voltage is used by automated sprinkler systems?
• What is the white powder or crust found on masonry walls caused by salt drawn to the surface by moisture?
• According to the OSHA standards for the construction industry, compressed air shall not be used for cleaning purposes except when __________.
• How do you properly plant ground cover?
• Caliche soil is recognized by its:
• What is the primary role of reinforcement steel in a concrete slab?
• What is the minimum PSI of concrete steps exposed to weather?
• If employees provide their own protective equipment, who must assure its adequacy, including maintenance and sanitation?
• To convert feet of head to pressure in psi, multiply by which factor?
• Which project is outside the scope of a CR-21 license?
• What do you use to give a block wall a finished look?
• What is the actual size of a 2 x 4 surfaced dry piece of framing lumber?
• For pond fabric, the required length is maximum length times which combination of depth?
• What is the minimum initial bed joint thickness for placing a masonry unit?
• How soon should you backfill a trench?
• Which fertilizer analysis is best for use in the desert?
• What type of block is best for filled cell applications?
• What procedure should be used to install a flagstone patio?
• Two-core block design reduces heat conduction by what percentage?
• When the bottom of a trench does not form the bed for the pipe and is below the installation level, backfill with sand or fine gravel in layers of maximum depth how many inches?
• Grass is scheduled for fertilization, what should not be used?
• What thickness in millimeters of pavers is used for residences?
• When should drainage tile be installed in a landscape project?
• For a custom DC electrical system, who must provide the 115-120 volt circuit to the location where the transformer is located?
• Which statement best describes the proper moisture state of a concrete post hole mix for pouring?
• To provide irrigation benefits for most plants, what percent of the root zone should be wetted?
• How close must a circuit breaker (disconnect) be installed to an irrigation pump?
• Which of the following is an example of a conifer?
• You should space lawn sprinkler heads so the coverage does not exceed ________ of another sprinkler head's coverage.
• Which factor does not affect sprinkler system precipitation rate?
• Which fertilizer analysis is best for use in the desert?
• What are the three terms used to describe soil volumes in undisturbed, disturbed with air, and compressed states?
• Materials or equipment that could pose a hazard by falling or rolling into excavations must be kept at least how many feet from the edge of excavations?
• What is the minimum PSI of concrete steps exposed to weather?
• What is the final step by the plasterer when finishing a sand finish coat?
• What is the approximate average compressive strength of paving bricks?
• What guarding requirement applies to portable, power-driven circular saws?
• What is the most important factor in choosing plants for xeriscaping?
• In the excavation rule, within what distance from an underground facility should you carefully expose the facility with hand tools?
• When setting a wood fence post in concrete, the bottom end of the post should be set in:
• What is the grading term for removing earth from a slope?
• If street pressure is 40 psi and 12 psi is lost to friction, what is the available head in feet of water?
• How many linear feet of edging are required to go around a circle with an 8 foot diameter?
• What is done after portions of backfill are placed in the trenches?
• You have 3 BCY of clay, after excavation you will have how many LCY?
• What minimum pipe size is needed to carry 5 GPM at a velocity of 5 FPS or below for a 100-foot run?
• How should a large galvanized pipe be connected to a smaller PVC pipe?
• What is the maximum allowable crack in an expansion joint?
• Which standard is used for testing backflow prevention devices?
• What is the most cost-effective use of a cut?
• What is the minimum sub base thickness for a residential paver pathway?
• How is pool liner length calculated?
• Which type of nail resists rust and provides strong holding power for fencing?
• What is the minimum air space clearance for chimneys located entirely outside the exterior walls of the building?
• What device is used to reduce pressure in an irrigation system?
• What determines the size of the pipe used in a sprinkler system?
• What maximum pressure is allowed in a water distribution system before a pressure reducing valve is required?
• Efflorescence salts may originate from salts mixed into which components?
• What is the minimum required backflow protection?
• How should PVC piping be laid in a trench?
• What should be done with scrap wood containing nails before stacking or piling it?
• A 3:1 grade fence with an 18-foot run has what height?
• What label is required on all gray water piping?
• Which principle of landscaping design deals with the size relationships between elements?
• What is the maximum distance a plasterer's scaffolding platform can be from the wall face without additional fall protection?
• Which plant characteristic becomes important for traffic control when selecting species?
• How should a post hole be dug in terms of bottom vs top dimensions?
• What is the required slope for distribution pipes per 100 feet?
• What is the maximum recommended joint width when laying stone for a uniform pattern?
• What does the size of the weir opening primarily control?
• Which factor most directly affects energy delivery in a long low-voltage wire?
• Which insect is bad for turf?
• What is the typical thickness of rectangular fired clay paving brick?
• Humus in soil is primarily associated with which property?
• How many volts does a typical automated sprinkler system use?
• What unit is used to specify the thickness of a vapor retarder?
• A 120 volt electrical system will:
• The hollow portions in two-core blocks provide space for what?
• On low voltage electrical plans, what should exist?
• What is the purpose of a channel projector for a waterfall?
• What type of backflow prevention is used between the sprinkler and circuit valve?
• How deep below the original surface should the top of the distribution pipe be placed?
• Which of the following is a cohesive soil?
• Caliche soil is recognized by its
• In landscaping, which direction must water drain?
• Which of the following is not a warm-season grass?
• What color is used to denote Reclaimed Water in the safety color-coding scheme?
• What color indicates Sanitary Sewer Systems?
• Which metal resists rust best for screws?
• How wide should the footer be for a CMU wall?
• If a job requires 80 man-hours and five workers are available, working an eight-hour day, how many days will it take?
• Backflow prevention devices are used to prevent contamination of potable water from non-potable sources. Which situation describes why such devices are needed?
• The international color code used by utility locators to mark an underground gas line is?
• In an Atmospheric Vacuum Breaker, what happens when the circuit valve closes?
• All of the following will not decrease the water pressure in a long run of irrigation pipe except?
• How often does a backflow prevention device have to be tested?
• A pump connected to a hydro pneumatic storage tank that cycles on and off is a result of:
• You have 3 BCY of clay. After excavation you will have how many LCY?
• Weep holes are used behind which feature to drain water from behind the structure?
• How can you fix overworked concrete?
• Why are brass screws recommended for redwood fences?
• Antitranspirants are also called what?
• According to OSHA, what type of evacuation plan is needed for an employer with 10 or fewer employees?
• According to ASTM C 94, within what time after water is added must concrete be delivered and discharged from the truck mixer?
• Which best describes foliage on trees?
• Which statement best describes xeriscaping as a fundamental?
• Which backflow device is used when attaching the irrigation system to a chemical tank (pre-emergent, etc.)?
• If stone is placed in random patterns, it is best laid in which shape?
• What is the correct action when scrap wood contains nails and is to be stacked in a work area?
• What is the minimum size perforated pipe for a gray water irrigation system?
• When the main and lateral lines are placed at the same depth, which component is typically used to control flow?
• Which sequence correctly describes how to calculate concrete volume in cubic yards for a rectangular footing?
• All water service yard piping shall be buried at least what depth below the average local frost line?
• What protective measure is sometimes required for buried irrigation wiring on federal government projects?
• There are four RCV valves drawing 0.15 amps each at 24 volts. What is the total wattage?
• What is the minimum diameter for distribution piping?
• What is the best time to water turf grasses to prevent turf disease?
• When setting a fence post in concrete, how should the top surface be finished?
• What type of wire may be used underground without conduit?
• In a hydraulic irrigation system, what action causes the valves to open?
• How soon after applying a herbicide should the sprayer tank be cleaned out?
• A 3:1 grade has an 18 foot run, what is the height?
• In irrigation valve systems, which device is typically actuated by electricity to open or close the valve?
• Which plant would be an example of a spreading plant that may be planted at the corners of buildings?
• When measuring the amount of fabric to use for a pond, you should take the maximum length times?
• Which formula correctly determines the ratio of slope?
• What personal protective equipment is required when using an abrasive wheel?
• Which type of pump is commonly used to boost pressure along pressurized lines?
• What must a survey instrument be equipped with to measure both distance and elevation?
• What causes water hammer?
• For transplanting trees and shrubs, which soil approach is best?
• What is the primary purpose of a control joint in a concrete sidewalk?
• Which of the following spray nozzles would be used on non sodded banks or berms to minimize run off?
• Which feature makes a shrub an effective windbreak?
• When doing heavy duty grinding with potential facial injury, in addition to eye protection, what is required?
• What direction should the concrete around the post slope to drain water?
• Which of the following determines the planting of trees or shrubs along a sidewalk?
• OSHA requires injury and illness records for companies with more than how many employees?
• Which spacing pattern provides better coverage and less water waste in sprinkler layouts?
• What determines the backfill grade for a trench?
• Where would you plant flowers for a focal point?
• Which statement best describes the curing times for the scratch coat after application?
• Which combination of PPE constitutes OSHA minimum safety equipment in the provided material?
• In pond construction drainage, what are the required trench dimensions and tile specifications?
• What procedure should be used to install a flagstone patio?
• A block unit measuring 7 5/8 inches wide, 7 5/8 inches high, and 15 5/8 inches long is commonly referred to by which nominal size?
• A chemical NOT used as a perservative for treating wood fencing is:
• Which condition will decrease water pressure in a long run of irrigation pipe?
• Which tree characteristic most affects erosion?
• In clay soil, water movement is more horizontal than vertical.
• Which device is used to prevent back siphonage only?
• How should the trowel be held against the wall when plastering with Portland cement used for exterior application?
• What minimum slope is recommended across turf areas to provide positive drainage?
• In landscape design, the incurve refers to which part of a curved bed?
• On a fertilizer label, what does the middle number (the second value) represent?
• What is the planting method called when rhizomes or stolons are placed in trenches and covered?
• Which irrigation system delivers water primarily to the root zone through emitters near plants?
• What is the volume of concrete required for a 4 inch thick pad measuring 8 by 20 feet?
• Expansion joints in masonry walls primarily serve to prevent which problem?
• When trench bottom is below the installation level of the pipe, the backfill must be composed of what material placed in layers?
• The international color code used by utility locators to mark an underground gas line is:
• Spring flowering shrubs should be pruned in:
• What is the correct method of building a masonry wall?
• How do you ground a metal fence?
• In utility marking, what does the color orange indicate?
• If slope rises 9 inches over 45 inches run, what is the Run/Rise ratio?
• Two-core block design advantages include which of the following?
• Which statement best describes the effect of temperature on PVC piping installed in trenches?
• When attaching a diagonal brace to a wood gate, where should the lower end be anchored?
• In abrasive blasting, what is used to remove mortar or stains from masonry surfaces?
• When constructing between two corner leads, how should a mason's line be used?
• In the example footings, what is the depth of the footing?
• What is the white powder or crust found on masonry walls caused by salt drawn to the surface by moisture?
• On a landscape plan, how many sprinklers with a 9-foot radius are shown?
• What is the purpose of a fitting?
• What is the minimum distance between the top of the sewer line and the bottom of a water line where they cross?
• Who is responsible for maintaining safety PPE equipment if employees bring their own?
• One cubic yard equals how many cubic feet?
• When pulling fabric on chain-link or wire fences, to which post do you attach the stretcher?
• What is the mil rating of the vapor barrier that must be installed under a concrete slab?
• What is the required lap distance for joints in a 6-mil polyethylene vapor retarder installed under a slab?
• What is the maximum fine for willful violation of Arizona Blue Stake?
• In the example footings, what is the length of the footing?
• Which kind of screw resists rusting?
• In a typical irrigation system that uses a well as the water source, which of the following is NOT a concern as a cause of water hammer?
• If a trenching machine can excavate 5 feet in 30 seconds to 1 minute, how should a 50-foot trench be dug?
• Which color corresponds to Gas, Oil Distribution in the color-coding scheme?
• What is the proper cement-to-sand ratio for exterior Portland cement plaster applications?
• A diagram indicates a system that delivers water directly to plant root zones using emitters close to the plants. Which irrigation system is depicted?
• How deep should a post be placed in the ground if NO concrete is used?
• Blue Stake uses green to mark which of the following?
• Dynamic total head is obtained by adding which two components?
• In irrigation controller wiring, the loop from the controller to the valve and back is commonly known as what?
• To prevent salt buildup around a plant, watering patterns are ______.
• Which feature makes a shrub an effective windbreak?
• The curing of concrete continues as long as its relative humidity remains above __________.
• In clay soil the movement of water is ________.
• Where should the top end of the diagonal brace on a wood gate be located?
• An Atmospheric Vacuum Breaker (AVB) is a backflow prevention device that incorporates which features to prevent backsiphonage?
• In sandy soil, the movement of water is more
• What is used when the main and lateral lines are placed at the same depth?
• During the zone-by-zone flushing, how should you proceed with risers?
• What is the minimum clearance for a combustible mantel OVER a fireplace opening?
• What step is performed after portions of backfill have been placed in trenches?
• If a control tube to a hydraulic remote control valve in a sprinkler system ruptures, what will the valve do?
• Why do clay soils need more water than other soils?
• How far apart should bands be placed?
• All of the following factors affect sprinkler system precipitation rate except:
• Tampers, sometimes called jitterbugs, push the coarse aggregate in concrete below the surface to consolidate it. Which device is described?
• In starting courses laid over foundations, bed joints must be within which thickness range?
• What should be placed over a drain tile prior to installing a pond liner?
• What determines the pattern and quantity of water coming out of a spray head?
• What is the length of a standard concrete block including the mortar joint?
• Which of the following is NOT a concern regarding water hammer in a typical irrigation system using a well?
• What is the function of humus in soil?
• What minimum size perforated pipe shall be used in a gray water irrigation system?
• When should fence rails be installed in relation to fence posts?
• Which statement correctly reflects the exterior cement-to-sand mix by parts?
• How do you choose a weir?
• Weep Holes may be utilized in which method of change in site grading?
• What is the preferred slope for a brick paver walkway in a well drained area?
• In a square sprinkler layout, why must heads be placed closer toward the center?
• When a specific depth of soil is removed on a site, what is this process called?
• Who must identify and mark underground facilities before you dig?
• Where should boosters be installed?
• For trenching 50 feet along a utility line, which method is appropriate given safety concerns?
• Which method of tree transportation is usually limited to dormant species?
• What minimum air space clearance to combustibles is required for masonry chimney portions located in the interior or within the exterior wall?
• What will cause a drop in power in a low voltage line?