CR-21 Landscapes and Irrigation Practice Test

These questions are part of the practice quiz. Start practicing

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