CR-21 Landscapes and Irrigation Practice Test

These questions are part of the practice quiz. Start practicing

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