AZ ROC Hardscaping and Irrigation Systems – Residential and Commercial (CR-21) Practice Exam

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• If you cut a power line while excavating and are found in violation of the law, what is the fine?
• A contractor determines trench fill grade based on what document?
• What type of backflow prevention is used between sprinkler and circuit valve?
• What is the recommended number of coats when plastering masonry?
• There are four (4) RCV valves in a sprinkler system that are wired independently and draw 0.15 amps each. If the system voltage is 24 volts, what is the total wattage demand for these four (4) valves?
• A CR-21 licensee may build a retaining wall up to what height?
• Which factor determines the quantity of water flowing in a pipe?
• Which statement correctly identifies a non-concern for water hammer in irrigation systems using wells?
• If four RCV valves operate independently and each draws 0.15 A at 24 V, what is the total current draw?
• You need to trench a 50' along a utility line. A trenching machine excavates 5' in 30 seconds to 1 min. How should the trench be dug?
• How should the trowel be held against the wall when plastering with portland cement used for exterior application?
• What method of tree transportation is usually limited to dormant species?
• How do you attach wood bracing on a gate?
• Which method is used to control plaster thickness during application?
• What is the advantage of veneer plaster over conventional plaster?
• On a long run over 100' from a low voltage transformer, what size wire would be best suitable?
• For pond fabric calculations, which expression is used as the multiplier for the maximum length?
• How deep should a post be placed in the ground if no concrete is used?
• How far apart should bands be placed?
• What term describes the rounded mass of soil that nurseries wrap in burlap to move shrubs?
• Primary purpose of a control joint in a concrete sidewalk
• Which plan type focuses on the placement of plantings, their spacing, and selection in a landscape project?
• What is the suggested test pressure for solvent cemented joints?
• Where should weep holes be placed in block wall drainage?
• When measuring the amount of fabric to use for a pond, you should take the maximum length times?
• The term for the white salt deposits that form on masonry surfaces due to moisture moving salts to the surface is?
• If a chain-link fence is 60 feet long, how far apart are the posts spaced?
• What is a GFI used for?
• What is OSHA's primary reason for keeping materials away from a trench during excavation?
• What is the minimum depth of a hearth in front of a masonry fireplace?
• A concrete slab should be bull floated as soon as possible after
• If grass clippings are left on the lawn, the recommended clipping length is what fraction of blade length?
• The white powder or crust on masonry walls caused by salts drawn to the surface by moisture is called?
• Which type of masonry bond is the weakest?
• Which backflow preventer is used when attaching an irrigation system to a chemical tank to prevent contamination?
• Which block is designated for filled cell applications?
• In irrigation layout, emitters should be placed away from which plant part to avoid damage?
• Blue Stake in Arizona has a tolerance zone that includes the facility width plus how many inches?
• What term describes a 1/2 inch layer of accumulated organic material in a lawn?
• All of the following are warm season grasses EXCEPT?
• Which backflow prevention device is commonly used in irrigation systems to prevent reverse flow and is often preferred when atmospheric devices are not permitted?
• What should be placed over a drain tile prior to installing a pond liner?
• What is best for aerating grass?
• Most pressure type vacuum breakers are installed at what minimum distance above the highest outlet?
• What percentage of volume remains after compacting 12 BYC of sand to 11.76 BYC?
• Under OSHA guidelines, which evacuation plan type is appropriate for an employer with ten or fewer employees?
• Which material is commonly used for exterior screws due to corrosion resistance?
• For a formal hedge to remain full of foliage from the top down to ground level, what must be true about the base compared to the top?
• Blue stake uses green to mark which of the following?
• Including the mortar joint, what is the standard length of a concrete block?
• What soil amendment is high phosphorus fertilizer used in flower beds containing bulb plants?
• In brick cavity walls, expansion joints are required on each side of an external corner if the wall length exceeds how many feet?
• In masonry, which bond requires vertical joints to align across the wall?
• What is a retaining wall?
• What type of plan is typically used to show where plantings will be placed in a landscape project?
• What is the minimum bearing for a lintel over jamb ends?
• Which of the following is a primary benefit of humus in soil?
• Where would you plant flowers for a focal point?
• Which color marks sanitary sewer under Blue Stake markings?
• During trenching and excavating, OSHA requires that materials stored near the trench be kept at least how many feet away from the trench?
• Blue Stake uses green to mark which utility?
• What is the maximum height allowed for a single grout pour of a masonry wall?
• Maximum bed joint thickness between masonry units is
• What is a typical spacing between fence bands?
• After the first course of a black wall, how long should you wait before continuing?
• How do you prevent winter heaving of ground cover?
• In pond design, what is the primary purpose of a weir?
• Which joining method is used to join metal fence panels?
• Which statement is true about selecting a weir when precise head calculations are not performed?
• What soil amendment sweetens an acid soil?
• What color best identifies the blue stake marking for portable water?
• Which of the following is a cohesive soil?
• When preparing an area for excavation, what color paint should be used to mark the area?
• What determines the pattern and quantity of water of a spray head?
• Which expression best describes slope as run relative to rise?
• Under typical code requirements, footings shall be stepped when the ground surface slopes more than what ratio or to change the top footing surface elevation?
• When planting a tree, which backfill material is recommended?
• What should be done if, upon arriving at the jobsite, the substrate is found defective?
• Which type of wire can be used for direct burial to lawn sprinkler valves?
• A 60-PSI main line rises 20 feet to a valve. What is the static pressure at the valve?
• Which grass is a cool-season grass among the options provided?
• How do you determine slope percentage?
• Placement of emitters should avoid direct contact with
• What can be applied to arid region tree trunks to prevent water loss?
• In a pipe system under fixed pressure, which factor most directly controls the flow rate?
• Which feature helps drainage along a block wall?
• What is the proper action for scrap wood that contains nails before stacking or piling it?
• What kind of screw resists rusting?
• The placing of concrete on frozen earth is?
• A masonry pattern with all vertical joints aligned is called
• If you are going to leave the clippings of the cut grass, what length should you cut at?
• A blockage at the inlet of an electronic solenoid diaphragm valve would prevent water from entering which part?
• Which side of a cactus tends to develop a thicker, tougher skin due to sun exposure?
• When can you use a drain valve in the main and lateral pipes for winter drainage?
• What determines the size of pipe used in a sprinkler system?
• What is the correct maximum height difference between adjacent pavers?
• OSHA requirement: Employers with 11+ employees must maintain records of injuries and illnesses
• What symbol represents ground cover?
• Why is holding current important in irrigation?
• Which term describes the organic material in soil formed from decomposition of plant and animal matter?
• All piping for gray water shall be marked
• How close can your string line be to the cinder block wall you are building?
• What is the minimum thickness of the scratch coat?
• In a 100-foot section of pipe carrying 5 GPM, which pipe size is the smallest that keeps velocity under 5 feet per second?
• How high can a segmented wall be built?
• Street pressure is 40 PSI and 12 PSI is lost to friction, what pressure will be available?
• Which component determines the water distribution pattern of a sprinkler spray head?
• In an irrigation system, holding current is important because:
• For a CMU wall, how wide should the footer be relative to the block width?
• What is the length of a standard concrete block including the mortar joint?
• What is the minimum distance above the highest outlet for most pressure type vacuum breakers?
• Which plan type is primarily used to show the arrangement, spacing, and species of plants in a landscape project?
• Decaying Organic Material creates what substance?
• When planting a tree, what is the best method to help insure its survival?
• Which landscape symbol denotes ground cover?
• Spring flowering shrubs should be pruned when?
• Which tool is used to ensure bricks stay in a straight course while laying bricks?
• When planting a shrub with a rounded root ball wrapped in burlap, what hole shape and dimensions should you prepare?
• Bone meal, used as a soil amendment for bulb beds, provides which nutrient?
• Which fitting is used to join polyethylene and PVC pipes?
• You are going to pour a concrete pad that is 16 feet by 22 feet and 4 inches thick. How many cubic yards of concrete are needed?
• Which of the following is NOT a concern as a cause of water hammer in an irrigation system that uses a well as the water source?
• If the available pressure after friction is 28 psi, what is the corresponding hydraulic head in feet?
• How long before digging should you notify the local marking company?
• What is the maximum fine for willful violation of Arizona Blue Stake?
• The sprinkler water passing through an electronic solenoid diaphragm valve contains debris and the inlet port is blocked, water cannot flow into the:
• The use of mulch on new plants does all of the following except?
• Which block type is best for filled cell applications?
• In sandy soil, movement of water is more vertical than horizontal.
• To reduce voltage loss over a long electrical run, which action is recommended?
• A pump connected to a hydro-pneumatic storage tank that cycles on and off is usually caused by what condition?
• Blue stake markings identify portable water; which color is used?
• In landscape design, the natural focal point for a curved bed is typically located where?
• What is the recommended cement to sand ratio when applying exterior Portland cement?
• What is the minimum initial bed joint thickness for placing a masonry unit?
• Which of the following is the strongest wood?
• When a substrate is found defective on arrival, what is the recommended method of notification to the owner?
• To control plaster thickness, which combination of tools is typically used during installation?
• What determines the quantity of water flowing in a pipe?
• When brick is laid on concrete foundations, what is the maximum thickness allowed for the first bed of mortar joint?
• Which technique is recommended to install a wood fence on uneven ground?
• An expansion joint in the outer wythe of a brick cavity is provided on each side of an external corner if the wall is greater than how many feet?
• A transformer with a photocell should be installed in what location?
• What is the hydraulic head in feet corresponding to 28 psi?
• Which approach is recommended when selecting a weir without calculations?
• Footings must be stepped if the ground slope demands it; this occurs when the slope exceeds what condition?
• What type of back flow device is used when attaching the irrigation system to a chemical tank (Pre-emergent)
• Which valve has the greatest tendency to wear out or break over time?
• What is the minimum thickness of the exterior wall of a fireplace?
• How are decorative metal fence panels put together?
• In winter drainage, what frost depth condition allows use of a drain valve?
• What is the preferred method for plastering masonry?
• For an irrigation pump, a circuit breaker must be installed within how many feet of the pump?
• What type of kitchen may a CR-21 build?
• Which step should be performed before grading to ensure proper drainage?
• A fence footing is specified as 2 feet deep, 1 foot wide, and 40 feet long. Approximately how many cubic yards of concrete are required?
• What factor controls the amount of water that can flow through a pipe at a given pressure?
• Which soil amendment is used to neutralize acidic soil?
• What is used to hold blocks together?
• Which statement describes the purpose of a backflow preventer in irrigation systems?
• According to OSHA, what type of evacuation plan is needed for an employer with 10 or fewer employees?
• Which base material is recommended to cover over a drain tile before laying a pond liner?
• Before grading a construction site, which assessment is essential to perform?
• Which finish can be applied to arid-region tree trunks to prevent water loss?
• If it takes 20 seconds to fill a 3 gallon bucket, what is the flow rate in gallons per minute?
• What is the minimum exterior wall thickness for a fireplace?
• Which tree transportation method involves moving trees with the root ball wrapped in burlap?
• What is best to use when laying a course of brick?
• What is the primary purpose of humus in soil?
• What is the proper method for installing a wood fence on a slope?
• What is a 1/2 inch of accumulated organic material in a grassy area called?
• When planting ground cover, how should the plants be arranged?
• What is the best way to compact soil?
• The joint designed to control cracking in concrete is called
• In landscaping, which direction must water drain?
• Bed joints between masonry units are commonly allowed up to which thickness?
• How do you connect a large galvanized pipe to a smaller PVC pipe?
• Which combination best represents the minimum PPE according to OSHA?
• Which principle of landscaping design deals with the size of landscaping items?
• What insect is bad for turf?
• How do you choose a weir?
• How do you connect PE to PVC?
• What voltage does an automated sprinkler system typically operate at?
• How many straps are required on a 4 foot chain link fence?
• What size rebar is used in a 6' tall block fence?
• If you have 12 BYC (Bank cubic yards) of sand, how much will you have after compaction?
• Which formula is used to calculate wattage in electrical circuits?
• The control wire should not be connected to
• What is the minimum PSI of concrete steps exposed to weather?
• In pond construction, what is the function of a weir?
• After the pipe sections and sprinkler assembly are put into a trench, what do you do?
• A lintel should have a minimum of how many inches of bearing over the ends of each jamb?
• Which plaster method is generally faster to install?
• When setting a wood fence post in concrete, the bottom end of the post should be set in
• A CR-21 licensee may install residential misting systems under what PSI?
• In curved garden bed design, the focal point is most naturally placed on which portion of the curve?
• Which description best captures the purpose of a retaining wall in landscape work?
• Which term best describes the water-holding capacity improvement attributed to humus?
• To insure drainage, when building a block wall, what should you do?
• How precise must the string line distance be for cinder block alignment?
• When sinking a wooden fence post into concrete, which base material helps with drainage and prevents direct contact with soil?
• In masonry work, the maximum height for a single grout pour is?
• Which element in fertilizer governs the growth rate and the green color of grass?
• For a chain-link fence 60 feet long, if posts are spaced 10 feet apart, how many spaces exist between posts?
• What is the friction loss for 10 gallons per minute in 100 ft of 3/4 inch pipe?
• What is the maximum height difference allowed between interlocking and pavers?
• When can you use a drain valve in the main and lateral pipes for winter drainage?
• When using Portland cement on an exterior, what is the proper ratio of cement to sand?
• Which items constitute the minimum PPE according to OSHA?
• What formula determines the ratio of a slope?