NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers, Exams of Social Contract Theory

Download NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers and more Exams Social Contract Theory in PDF only on Docsity! NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers What are 4 types of Steel Decking? - correct answer Composite, Roof, Cellular, and Form What are the lengths of Full sheets of Steel Decking? - correct answer 12", 18", 24", 30", or 36". All are usually less than 40" Who has full responsibility for Safety on a construction site? - correct answer The prime contractor Who is responsible to ensure workers have appropriate eye protection? - correct answer The employer Safety belt lanyard shall be a minimum of? - correct answer 1/2 inch nylon, w/ max length to provide for a fall of no greater than 6ft. The rope shall have a nominal breaking strength of 5,400 lbs. When should safety nets be provided? - correct answer When workplaces are more than 25 feet above ground or water surface or where use of ladders, scaffolds, catch platforms, temporary floors, safety lines, or safety belts are impractical NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers What are the different types of Safety Equipment? - correct answer Head, Eye and Face, and Respiratory protection. Safety belts, lifelines, lanyards, and safety nets Where should quantities of flammable liquid in excess of 25 gallons be stored in that is acceptable or approved? - correct answer Acceptable wooden storage and Approved metal storage cabinets. Cabinets shall be labeled in conspicuous lettering "Flammable-Keep Away from Open Flames" LP-Gas storage outside of buildings for containers waiting use shall be located from the nearest building or group of buildings in accordance to? - correct answer 1. 500 lbs or less - 0ft 2. ***501 to 6,000 lbs - 10ft 3. 6,001 to 10,000 lbs - 20ft 4. Over 10,000 lbs - 25ft Clearance and mounting of temporary heating devices are? - correct answer 1. Room heater, circulating type - 12" sides, 12" rear, 18" chimney connector NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers total number of wires, or if rope shows other signs of excessive wear, corrosion, or defect Waste materials - when materials are dropped more than 20 feet to any point lying outside the exterior walls of the building what is needed? - correct answer An enclosed chute of wood, or equivalent material, shall be used. Enclosed chute is a slide, closed in on all sides, through which material is moved from a high place to a lower one All other hand-held powered tools such as circular saws, chain saws, and percussion tools without positive accessory holding means, shall be equipped with what? - correct answer A constant pressure switch that will shut off the power when the pressure is released Compressed air shall not be used for cleaning purposes except when? - correct answer Where reduced to less than 30 p.s.i and then only with effective chip guarding and personal protective equipment which meets the requirements. The 30 psi requirement does not apply for concrete form, mill scale and similar cleaning purposes NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers Who shall be allowed to operated a powder-actuated tool? - correct answer Only employees who have been trained in the operation of the particular tool in used All employees using abrasive wheels shall be protected by? - correct answer Eye protection equipment Guarding, all portable, power-driven circular saws shall be equipped with what? - correct answer Guards above and below the base plate or shoe. The upper guard shall cover the saw to the depth of the teeth, except for the minimum arc required to permit the base to be tilted for bevel cuts. The lower guard shall cover the saw to the depth of the teeth, except for the minimum arc required to allow proper retraction and contract with the work. When the tool is withdrawn from the work, the lower guard shall automatically and instantly return to the covering position. Valve protection caps shall not be used for lifting cylinders from one vertical position to another. - correct answer Bars shall not be used under valves or valve protection caps to pry cylinders loose when frozen. NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers Warm, not boiling, water shall be used to thaw cylinder loose How should compressed air be secured? - correct answer In an upright position at all times except, if necessary, for short periods of time while cylinders are actually being hoisted or carried What distance shall Oxygen cylinders in storage be separated from fuel-gas cylinders or combustible materials (especially oil or grease)? - correct answer A minimum distance of 20 ft (6.1m) or by non-combustible barrier at least 5 ft (1.5m) high having fire-resistance rating of a least one-half hour. Inside of buildings, how shall Gas cylinders be stored? - correct answer In a well protected, well-ventilated, dry location, at least 2 ft (6.1m) from highly combustible materials such as oil or excelsior. Cylinders should be stored in definitely assigned places away from elevators, stairs, or gangways. Assigned storage places shall be located where cylinders will not be knocked over or damaged by passing or falling objects, or subject to tampering by unauthorized persons. Cylinders shall not be kept in unventilated enclosures such as lockers and cupboards. NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers 4. Nominal voltage to ground, 25,001 to 75kV = Conditions 6ft, 8ft, 10ft 5. Nominal voltage to ground, Above 75kV = Conditions 8ft, 10ft, 12ft Each scaffold and scaffold component shall be capable of support, without failure, what? - correct answer Its own weight and at least 4 times the maximum intended load applied or transmitted too it Each scaffold unit shall be installed so that the space between adjacent units and the space between the platform and the uprights is? - correct answer No more than 1 inc (2.5cm) wide, except where the employer can demonstrate that a wider space is necessary (for example, to fit around uprights when side brackets are used to extend the width of the platform) Each scaffold platform and walkway shall be? - correct answer At least 18 inches (46cm) side The front edge of the platforms shall - correct answer Not be more than 14 inches (36cm) from the face of the work, unless guardrail systems are erected NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers along the front edge and/or personal fall arrest systems are used in accordance with paragraph G The maximum distance from the face for outrigger scaffolds shall be? - correct answer 3 inches (8cm) The maximum distance from the face for plastering and lathing operations shall be? - correct answer 18 inches (46cm) Each end of a platform, unless cleated or otherwise restrained by hooks or equivalent means, shall? - correct answer Extend over the centerline of its support at least 6 inches (15 cm) Each end of a platform 10 feet or less in length shall? - correct answer Not extend over its support more than 12 inches (30 cm) unless the platform is designed and installed so that the cantilevered portion of the platform is able to support employees and/or materials without tipping, or has guardrails which block employee access to the cantilevered end NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers On scaffolds where platforms are overlapped to create a long platform, the overlap shall? - correct answer Ocurr only over supports, and shall not be less than 12 inches (30 cm) unless the platforms are nailed together or otherwise restrained to prevent movement Scaffold components manufactured by different manufacturers shall not be? - correct answer Intermixed unless components fit together without force and structural integrity is maintained by the user. Components shall not be modified in order to intermix them unless a competent person determines the resulting scaffold is structurally sound. Supported scaffold poles, legs, posts, frames, and upgrights shall? - correct answer Bear on base plates and mud sills or other adequate firm foundation. Footings shall be level. Unstable objects shall not be used. Front-end loaders and similar equipment shall not be used for support unless they are specifically designed by the manufacturer. Fork- lifts shall not be sued. Fall protection: Each employee on a scaffold more than 10 feet (3.1m) above a lower level shall be protected from NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers correct answer Be protected from falling by a guardrail system, safety net system, or personal fall arrest system. Wall openings - correct answer Each employee working on , at, above, or near wall openings (including those with chutes attached) where the outside bottom edge of the wall opening is 6 feet or more above lower levels and the inside bottom edge of the wall opening is less than 39 inches above the walking/working surface, shall be protected from falling by used of a guardrail system, a safety net system, or a personal fall arrest system To edge height of top rails, or equivalent guardrail system members, shall - correct answer Be 42 inches plus or minus 3 inches above the walking/working level. When conditions warrant, the height of the top edge may exceed the 45 inch height, provided the guardrail system meets all other criteria of this paragraph. Intermediate members (such as balusters), when used between posts, shall - correct answer Be not more than 19 inches apart NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers Top rails and midrails shall - correct answer Be at least one-quarter inch nominal diameter or thickness to prevent cuts and lacerations. If wire rope is used for top rails, it shall be flagged at not more than 6 foot intervals with high-visibility material Safety nets and safety net installations shall - correct answer Be drop-tested at the jobsite after initial installation and before being used as a fall protection system, whenever relocated, after major repair, and at 6 month intervals if left in one place. The drop-test shall consist of a 400 pound bag of sand 30 +/- 2 inches in diameter dropped into the net from the highest walking/working surface at which employees are exposed to fall hazards, but not from less than 42 inches above that level Horizontal lifelines shall be designed, installed, and used, under the supervision of a qualified person - correct answer as part of a complete personal fall arrest system, which maintains a safety factor of a least two The attachment point of the body belt shall - correct answer Be located in the center of the wearer's back. The attachment point of the body harness shall be NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers located in the center of the wearer's back near shoulder level, or above the wearer's head. When mechanical equipment is not being used, - correct answer The warning line shall be erected not less than 6 feet from the roof edge After being erected, with eh rope, wire, or chain attached, stanchions shall - correct answer Be capable of resisting, without tipping over, a force of at least 16 pounds applied horizontally against the stanchion, 30 inches above the walking/working surface, perpendicular to the warning line, and in the direction of the floor, roof, or platform edge Covers for holes in floors, roofs, and other walking/working surfaces shall - correct answer Meet the following requirements: 1. Covers located in roadways and vehicular aisles shall be capable of supporting, without failure, at least twice the maximum axle load of the largest vehicle expected to cross over the cover 2. All other covers shall be capable of supporting, without failure, at least twice the weight of employees, NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers correct answer Be tested before employees enter excavations greater than 4 feet in depth. Employees shall be protected from excavated or other materials or equipment that could pose a hazard by falling or rolling into excavations. - correct answer Protections shall be provided by placing and keeping such materials or equipment at least 2 feet from the edge of excavations, or by the use of retaining devices that are sufficient to prevent materials or equipment from falling or rolling into excavations, or by a combination of both if necessary. Each employee in an excavation shall be protected from cave-ins by an adequate protective system designed in accordance with this section except when? - correct answer Excavations are less than 5 feet in depth and examination of the ground by competent person provides no indication of a potential cave-in Additional requirement for shield systems used in trench excavations. Excavations of earth material to a level not grater than 2 feet below the bottom of a shield shall? - correct answer Be permitted, but only if the shield is designed to resist the forces calculated for the full depth of the trench, and there are no indications while the NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers trench is open of a possible loss of soil from behind or below the bottom of the shield. Manual tests. Manual analysis of soil samples is conducted to determine quantitative as well as qualitative properties of soil and to provide more information in order to classify soil property - correct answer 1. Plasticity. Mold a moist or wet sample of soil into a ball and attempt to roll it into threads as thin as 1/8 inch in diameter. Cohesive material can be successfully rolled into threads without crumbling. For example, if a least a two inch length of 1/8 inch thread can be held on one end with-out tearing, the soil is cohesive. 2. Thumb penetration test can be used to estimate the unconfined compressive strength of cohesive soils. Type A soils with an unconfined compressive strength of 1.5 tsf can b readily indented by the thumb, however, they can be penetrated by the thumb only with very great effort. Type C soils with an unconfined compressive strength of .5 tsf an be easily penetrated several inches by the thumb, and can be molded by light finger pressure. The test should be conducted on an undisturbed soil sample, such as a large clump of spoil, as soon as practicable after excavation to keep to a minimum the effects of exposure to drying influences. If the excavation is later exposed to wetting influences (rain, flooding), the classification of the soil must be changed accordingly. NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers 3. Dry Strength. If soil is dry and crumbles on its own or with moderate pressure into individual grains or fine powder, it is granular (gravel, sand, or silt). If the soil is dry and falls into clumps which break u into smaller clumps, but the smaller clumps can only be broken u with difficulty, it may be clay in any combination with gravel sand or silt. If the dry soils breaks into clumps which do not break up into small clumps and which can only be broken with difficulty and there is no visual indication the soil is fissured the soil may be considered unfissured. Type A means cohesive soils with an unconfined compressive strength of 1.5 ton per square foot (tsf) or greater. Examples of cohesive soils are: clay, silty clay, sandy clay, clay loam and, in some cases silty clay loam and sandy clay loam. Cemented soils such as caliche and hardpan are also considered Type A. - correct answer However, no soil is Type A if: 1. The soil is fissured or 2. The soil is subject to vibration from heavy traffic, pile driving, or similar effects or 3. The soil has been previously disturbed or 4. The soil is part of a sloped, layered system where the layers dip into the excavation on a slope of four horziontal to one vertical (4H:1V) or greater, or NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers The following additional requirements shall apply for multiple story structures - correct answer 1. THE permanent floors shall be installed as the erection of structural members progresses, and there shall be not more than eight stores between the erection floor and the upper-most permanent floor, except where the structural integrity is maintained as a result of the design 2. AT NO time shall there be more than four floors or 48 feet, whichever is less, of unfinished bolting or welding above the foundation or uppermost permanently secured floor, except where the structural integrity is maintained as a result of the design. 3. A FULLY planked or decked floor or nets shall be maintained within two stories or 30 feet whichever is less, directly under any erection work being performed. Landing and placing loads - correct answer The weight of a bundle of joist bridging shall not exceed a total of 1,000 pounds. A bundle of joist bridging shall be placed on a minimum of three steel joists that are secured at one end. The edge of the bridging bundle shall be positioned with 1 foot of the secured end. NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers Demolition: When debris is dropped through the holes in the floor without the use of chutes, the area onto which the material is dropped shall? - correct answer Be completely enclosed with barricades not less than 42 inches high and not less than 6 feet back from the projected edge of the opening above. Signs, warning of the hazard of falling materials, shall be posted at each level. Removal shall not be permitted in this lower aread until debris handling ceases above. Chutes: - correct answer No material shall be dropped to any point lying outside the exterior walls of the structure unless the area is effectively protected. Access and Egress: - correct answer 1. Employer shall provide and maintain safe means of access and egress to all work stations 2. Employer shall provide access and egress in such a manner that employees are protected from being struck by excavators, haulage machines, trains and other mobile equipment 3. Employer shall control access to all openings to prevent unauthorized entry underground. Unused chutes, manways, or other openings shall be tightly covered, bulkheaded, or fenced off, and shall be posted with NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers warning signs indicating "Keep Out" or similar language. Completed or unused sections of the underground facility shall be barricaded. Ladders and Job-made ladders - correct answer Each portable ladder that is not self- supporting. At least four times the maximum intended load, except that each extr-heavy-duty type 1A metal or plastic ladders shall sustain at least 3.3 times the maximum intended load. The ability of a ladder to sustain the loads indicated shall be placed at an angle of 75 1/2 degrees from the horizontal. When portable ladders are used for access to an upper landing surface, the ladder side rails shall - correct answer Extend at least 3 feet above the upper landing surface to which the ladder is used to gain access; or, when such an extension is not possible because of the ladder's length, then the ladder stall be secured at its top to a rigid support that will not deflect, and a grasping device, such as a grabrail, shall be provided to assist employees in mounting and dismounting the ladder. In no case shall the the extension be such that the ladder deflection under a load would, by itself, cause the ladder to slip off its support. NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers 11. The equipment for level position 12. Operator cab windows 13. Rails, rail stops, rail clamps and support surfaces 14. Safety devices and operational aids Scaffolds shall be erected, moved, dismantled, or altered only under the supervision and direction of a? - correct answer Competent person quilified in scaffold erection, moving, dismantling or alteration. Such activities shall be performed only by experienced and trained employees selected for such work by the competent person Before an employee enters the space, the internal atmosphere must be tested, with a calibrated direct- reading instrument, for oxygen content, for flammable gases and vapors, and for potential toxic air contaminants, in that order. - correct answer Any employee who enters the space, or that employee's authorized representative, must be provided an opportunity to observe the pre-entry testing required Oxygen Level - correct answer Minimum oxygen content of 19.5% NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers Excavation: To find the load factor for common swell percentage - correct answer Divide the bank volume by the bank volume plus the swell percentage: For example, a soil that swells by 25% has a load factor of 0.80 (1 LCY / 1.25 LCY) Bank Cubic Yards (BCY) - undisturbed Loose Cubic Yards (LCY) - disturbed (swells) Compacted Cubic Yards (CCY) - compacted (shrinks) - correct answer 1. LCY = 1 BCY x 1.32 Example if truck capacity is 14 LCY and you need to export 1,000 BCY. Convert BCY to LCY, 1000 BCY x 1.32 = 1,320 LCY. Now take 1,320 LCY / 14 LCY = 95 haul trips 2. CCY = 1 LCY / 1.54 Example: 1,320 / 1.54 = 857 CCY 3. CUT = 4,000BCY x 1.32 LCY/BCY = 5,280LCY FILL = 4,000CCY x 1.54 LCY/CCY = 6,160 LCY 6,160LCY-5,280LCY = 880LCY more needed Trench volume - correct answer Example: trench is 100ft long by 2ft wide by 5ft deep. 100x2x5 = 1,000 BCF NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers BCY = 1000BCF / 27 = 37BCY Bulldozers - correct answer Each size and type of dozer has a range of appropriate uses and applications. Light utility rand from 40 to 80 hp and have blade capacity of 1.25 to 2.25 CY. Typical applications include residential and commercial foundations, grading, backfill, landscaping, light logging, and swamp dozing. Load time - correct answer Load time can be reduced by loading downgrade Using pusher assistance will increase the loading rate - correct answer Pushers should be powerful and heavy enough to push the scrapers through the cut ad accelerate, or boost, the scrapers as they leave the cut Reading plans - common plan symbols for underground utility work - correct answer Refer to Google Drive - JJJohnson Folder 3 pictures NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers Compression Strength - correct answer Contour Lines - correct answer Before you can estimate cut and fill quantities, you need to be familiar with topographic (contour) maps and contour lines. Contour lines on the map represent the third dimension (relief) of the ground surface. Contour lines represents points of equal elevation above or below an arbitrary reference (datum) plan such as sea level or top-of-slab (TOS) elevation. Single Charge Blasting - correct answer There are 2 common blasting techniques: single charge and sequential fireing. Single charge is the simplest form of blasting. The powder-man drills a hole in the rock, places and explosive charge in the hole and sets it off. The shock wave of the explosion travels in the directrion of least resistance - up, sideways or, in rare cases, down. To find the load factor, divide the bank volume by the back volume plus the swell percentage - correct answer For example: a soil that swells by 25% has a load factor of .80 (1 LCY / 1.25 LCY) NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers Slot dozing - correct answer Is one technique that can reduce the amount of load lost in transit. When slot dozing, the dozer works within a roughly 2 foot trench that's the same width as the blade. Pushing the soil in the slot keeps the load from slipping away. Well point system better in course grained soil - correct answer If you have a lot of pipe to install in bad groundwater conditions, consider dewatering ahead of pipe laying. Wellpoints, placed around the excavation site, are a potent dewatering solution. A wellpoint is a perforated tube that brings water to the surface via a suction tube (riser pipe). 20ft suction lift. pump 10-25 gallons per minute In post-tensioned concrete, until the concrete hardens to about 75% of it's full strength, - correct answer The tendon is not pulled (stressed). Therefore, initially both concrete and tendon have no stress. Needs to harden to 75% compression strength before jacking. When a member is designed so that under the working load there are no tensile stresses in it, then the concrete is said to be fully prestressed. On the other hand, if NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers tensile stresses are allowed to be produced in the member under working load, then it is termed partially prestressed (the process of applying a percentage of the final force at some earilier time than the normal 72 hours) - correct answer For partial prestressing additional mild steel rebar may be required to control cracking under tension. For economic reasons, partial prestressing is most common for of prestressing used in structures. Sufficient prestressing steel is used to offset most of the member self-weight and other sustained dead loads. Occasionally a small portion of live load is also included. The tension produced by the remainder of live load is resisted by the combination of stressed and non-stressed steel, resulting in economical structures. THE BONDED STEEL REBAR assures control of the crack width and distribution, should secondary effects or overloading cause the member to crack. Unbonded tendon fabrication procedures conform to the requirements of the Post-Tensioning Institute's "Specification for Unbonded Single Strand Tendons" published July, 1993 - correct answer The first step in the manufacturing process is the coating of the strand. The is accomplished using the plastic extrusion method. The bare strand is coated with P/T coating and then covered with plastic sheathing. The extrusion process begins by running the NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers 12" for jack, cable diameters .5" & .6" - correct answer 12" for jack, cable diameters .5" & .6" Stressing Barrier cable - correct answer The anchorage at the non-stressing-end be installed to force equal to 80% of the ultimate strength of the strand. The backstressing force should be equal to 80% of the ultimate strength of the strand. Nature of Soil. Soil types as determined by particle size - correct answer 1. Boulders: 12 in or larger in diameter 2. Cobbles: larger than 3 in, smaller than 12 in 3. Gravel: smaller than 3 in, and larger than #4 sieve (appr 1/4 in) 4. Sand: particles smaller than #4 sieve and larger than #200 sieve (40,000 openings per square inch) 5. Silts: particles smaller than .02 mm and larger than .002mm in diameter 6. Clays: particles smaller than .002 mm in diameter Table 2-1 Relative Bearing Strength of Soils - correct answer Refer to Google Drive - JJJohnson Folder NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers Groundwater Level: knowing the location of the groundwater level is important for 2 reasons - correct answer 1. HIGH WATER table means that EXTRA costs will be encountered during the excavation and construction of foundations for the contractor. 2. Water table affects the soil bearing capacity, which in turn determines the size and type of foundation required for the building challenge for the designer. Compaction Testing: compaction testing provides the site contractor with specific compaction value that must be achieved. Compaction testing is based on the relationship between soil dry density and the moisture content of the soil. - correct answer Lab test used is Proctor Test, developed by R.R. Proctor. Developed for testing slightly cohesive to cohesive soils Typical Concrete Curge and Gutter Cross Section - correct answer Refer to Google Drive - JJJohnson Folder 24" total 1. First layer, 6" bottom dirt 2. Second layer, 6" granular base 3. Third layer, 12" topsoil / curb. Curb is 16-24" wide. 6" from topsoil NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers Concrete sidewalks are usually 4 inches in thickness, 5 feet or wider. Joint spacing? - correct answer Crack-control joints are placed at 3 to 5 feet. Expansion joints are provided at intervals of 30 feet or less where sidewalks are bear against buildings or other fixed structures. Typically a 2,500 psi air-entrained concrete is used to provide a weather-resistant surface. The surface finish is a light broom finish, the edges are smoothed with an edging tool. Removing Groundwater - correct answer 1. Use a pump 2. Perimeter trenching with pumps 3. Lower the water table selectively in the area in which the excavating will take place by using dewatering system like well-points Items that affect cycle time - correct answer Cycle travel time is based on attainable speeds of the truck for loaded and unloaded conditions. Attainable speeds are affected by FOUR FACTORS: distance traveled, road resistance, grade resistance or assistance, and rimpull. NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers Different types of truss - correct answer King post, W truss, Howe truss, Pratt truss, Hammer beam, Cantilever, Baltimore truss, Bowstring truss, Belgian truss, and Sawtooth Alternative Roof-framing: Open-web, Structural steel, Timber, Precast concrete In structural steel frames, bracing usually consists of tension cross-bracing, provided that it does not interfere with opening locations. - correct answer This type of bracing allows for load reversals and ensures that stability is provided in both directions. The removal of one of these braces will produce instability in the frame because tension braces are not designed to resist compression loads. Girders: Connections between girder and columns can be either pin-type connections or moment-resisting connections. - correct answer 1. Pin-type connections are designed to resist vertical loads only and cannot be relied upon to resist lateral loads. 2. Moment connections between the girders and the columns provide lateral stability in the structural frame by preventing rotation between the girders and the columns. NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers Drift pin: Once a sufficient amount of steel has been put in place, final bolting is begun - correct answer Proper alignment of al connection plates and angles is done with the aid of a spud wrench and DRIFT pins Floor system: Composite, Wood, Cellular, Concrete - correct answer Cellular is the strongest Waffle slab forming - correct answer two-way joist system ready for concrete. Positive reinforcement in ribbed floors is concentrated in the ribs, and negative reinforcement as well as temperature steel is placed within the slab thickness Exterior Finishes and Facings - correct answer 1. Siding 2. Stucco - portland cement plaster provides durable, wether resistant, and cost-effective finish that can be comparable in performance to a brick finish 3. Brick and Stone 4. Precast concrete NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers Single-Ply Roof Membranes - EPDM - correct answer Thermoset membranes consist of rubber polymers and are commonly know as rubber roofing: the most common is ethylene propylene diene monomer (EPDM). Splicing of thermoset materials is done by lapping and requires the use of an additional adhesive to provide watertight seal at the overlap. Curtain Wall Construction: Masonry Curtain Walls - correct answer Masonry curtain walls were traditionally compsed of individual masonry units such as brick, clay tile, and concrete block. To improve versatility units were augmented such as panelized masonry, stone panels, and precast concrete panels. Masonry curtain walls may be separated in to two basic types: load-bearing and non-load-bearing Curtain Wall Construction - correct answer Includes: interior liner, an insulating layer, AIR GAP, and exterior finish. Methods of fireproofing - correct answer Cellular concrete makes an excellent fireproofing material because of its high insulation value and its light weight. 2, 3, or 4 in slabs NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers through #18 or (#10 through #57). The number denotes the diameter of the bar in eighths of inch. So #5 is 5/8" or 16mm in diameter. Sizes are: #3(#10mm), #4(#13), #5(#16), #6(#19), #7(#22), #8(#25), #9(#29), #10(#32), #11(#36), #14(#43), #18(#57) Rebar storage - correct answer At the jobsite, reinforcing bars are delivered to a storage or laydown area and unloading will be as directed by the Ironworkder Foreman. Rebar conditions - correct answer Surface conditions of reinforcing bars may affect the ability of the bars to bond to the concrete. The main factos that may decrease bond are the presence of mill scale, rust, oil, and mud. Rust improves bond because it increases the roughness of the surface Hoisting Rebar - correct answer When hoisting bundles of reinforcing bars roughly 30 ft or longer, it is usually necessary to use spreader beam / bars. The length of the spreader beam should be at least one-half the length of the reinforcing bars in the bundle. NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers Wire Bar supports - correct answer Refer to Google Drive under JJJohnson folder. JC - Joist Chair: 4, 5, and 6 in. widths and 3/4, 1, and 1-1/2 in heights General principles for placing, splicing and tying reinforcing rebars - correct answer Where not specified, minimum concrete cover (outside of bar to face of concrete) should be: 1. 3 inches at sides 2. 2 inches for bars larger than #5(#16) 3. 1-1/2 inches over ties and spirals in columns 4. 1-1/2 inches to nearest reinforcing bars on the top, bottom, and sides of beams and girders 5. 3/4 inch for #11 and smaller bars 6. 3/4 inch from the face of all walls not exposed directly to the ground or weather Slab rebar placing - correct answer Rebar 3" above grade and 2" from the top of slab NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers Types of Ties: various type of ties are used when securing reinforcing bars. Much of tying is done on flat, horizontal formwork such as floor slabs - correct answer Types of Ties: 1. Detail A, Snap or Single Tie - normally used in flat, horizontal work to secure reinforcing bars 2. Detail B, Wrap and Snap Tie - normally used when tying wall reinforcement so neither horizontal or vertical can shift during construction 3. Detail C, Saddle or "U" Tie - more complicated, used for securing column ties to vertical corner bars, beam stirrups to longitudinal corner bars 4. Detail D, Wrap and Saddle Tie - similar to the saddle tie except that the wire is wrapped 1-1/2 times around the first bar, used to secure heavy mats that are lifted by crane 5. Detail E, Figure Eight Tie - used in place of saddle tie and snap and wrap tie. Does not offer the holding strength of the saddle tie. Placing reinforcing bars in footings, walls and columns - correct answer Footing placement of bars in not critical. Footing placements are usually located 3 inches clear above the bottom NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers are at least two layers thick. Head lap is where shingles are three layers thick. Top Lap = W-E or E+HL Head Lap = TL -E or W -2E Exposure = (W-HL) / 2 Roll Roofing Exposure - correct answer Before installing the first full sheet, snap a chalk line 18-3/4" above the eaves. Nail a 19" wide selvage piece of the roll along the eaves. allowing a 1/4" overhang. Drive staggered nails on 12" centers along 2 rows 4-3/4" from the top edge and 1" from the bottom edge of the strip Roofing Base Sheets (vapor retarders) - correct answer They weigh 45 to 80 pound per square. The first membrane you install in a BUR system is the base sheet. The base sheet acts as a vapor retarder which protects the insulation or subsequent membranes from dames due to moisture from within the building. Built-up roofing. Surface Aggregate is often applied over a hot flood coat of bitumen on the surface of a BUR system - correct answer Aggregate does several importing things: NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers 1. protects the underlying roof system from heating, drying and weathering 2. prevents damage from foot traffic 3. serves as a ballast to resist wind uplift and improves the roof's fire 4. reduces the roof surface temperature Reasons for stone on BUR - correct answer Most common aggregates are rounded gravel, slag, or crushed rock, protects underlying roof system from heading, drying, and weathering, prevents damage from foot traffic, serves as a ballast to resist wind uplift and improves the roof's fire resistance, reduces roof surface temperature Rafters - provide for ventilation at eaves - correct answer When insulating rafters allow 1" minimum air space for ventilation. For thick ceiling insulation, install vent troughs for ventilation Condensation - correct answer The first and most important reason to install a vapor barrier is to prevent warm humid air from contacting a cold surface, which results in condensation. NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers The second reason is to reduce the flow of air between the inside of a building and the outdoors Measuring vapor barrier effectiveness - correct answer The ability of a vapor barrier to resist vapor penetration is measured in perms. One perm equals the transmission of 1 grain (.07 grams) of water vapor per square foot per hours per each inch of mercury vapor pressure difference between opposite sides of the vapor barrier. Attic Ventilation - correct answer With proper ventilation, air circulates freely through-out the attic carrying away the water vapor before it can condense. Never cover vent openings during cold weather and make sure that soffit vents are not blocked by insulation. A rule of thumb for attic ventilation is to allow 1 sq foot of net free vent opening for: each 150 sq ft of horizontal attic surface, or each 300 sq ft of horizontal attic surface when roof has vapor barrier or when half the vent openings are located at the ridge and other half located along the eaves Ventilating areas of gable roofs NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers Steel Deck: Example of 6" Penetration - correct answer See Google Drive: JJJohnson folder: 6inPentration Suggested Schedule: 1. One Rib Removed (6" diameter) - No reinforcing or .045" Plate (min) 2. 8" Diameter - .045" Plate (min) 3. 8"-13" Diameter - .057" Plate (min) 4. Over 13" dia - Frame opening, check cantilever ability of deck, design by project engineer Steel Deck: Example of details for openings: Details for openings to 24" perpendicular to deck - correct answer 24" opening, C4 x 5.4 Extend and Fasten to 3 Ribs beyond opening (each side) Trusses: Storage - correct answer Trusses should be unloaded as close to the Building site as possible to minimize handling Mechanical hoisting recommendations for single trusses - correct answer Use spreader bar (or stiffback) for Trusses longer than 30 feet NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers Trusses: Installation tolerances - correct answer The spacing of Trusses along bearing support must be within +/- 1/4" of plan dimension. Spacing beyond this tolerance shall be reviewed and approved by the building designer and truss designer Trusses: Bracing materials and fasteners - correct answer Use at least 2-16d ( 2-10d, 2-12d)nails to attach 2x4 lateral restraint and diagonal bracing members at each connection specified by the truss or building designer Trusses: Construction loading - correct answer Brace before loading. Don't stack materials on unbraced Trusses. Do stack a reasonable amount of material that will not overload the trusses. Trusses must be properly restrained and braced first. Trusses: Hoisting recommendations for Single Trusses - correct answer For single Trusses up to 30 feet, use a minimum of two pick-points near Top Chord joints spaced up to 1/2 the Truss length apart. Keep line angle to 60 degrees or less NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers Public vs Private Owners - correct answer The owner's most important function is financially back the project. Public Owners: 1/4 of construction is the US is done with public money (local, state, or federal), tax payer money. Universities and hospitals are publicly funded projects that are managed by private organization. Federal and state regulations that are not part of the local building codes can be enforced. Private Owners: Most construction is financed thru private ownership (can be homeowner or multinational company). Large companies often have a department of construction industry professionals who represent them during the design and building process. A developer is a special type of private owner who often owns the project only for the duration of the construction. They consider economic opportunities and the goal is to quick sale or thru long term rentals Organizing and managing a construction project - correct answer Successful projects need to be effectively organized. Good management systems help good leaders become even better. Levels of Specialization and Authority: the more specialized the function, the fewer issues a specific worker has to pay attention to. By dividing work more NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers noise mitigation, value engineering, design review, estimating, scheduling, procurement, work packages Construction Contract Documents - correct answer Documents are divided in to three general subsections: bidding, contractual, and technical. Addenda - after the documents are issued but before the bids are due, changes often need to be made. Contract Information - correct answer The contract includes an agreement, general conditions, special conditions, sample of bond, insurance requirements, and sample insurance form. Project Completion - correct answer Construction and turnover, commissioning, planning, and owner startup. Closeout usually takes place while the owner is starting to use the facility. Commissioning services focus on hvac, electrical, and fire alarm, and any building system. Planning for the end of the project, however, happens at the beginning. Project Size Modifier - correct answer See Google Drive: JJJohnson Folder: ProjectModifier NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers Project Estimating - correct answer Good organization is key to preparing reliable estimates and avoiding mistakes. The most important information for the estimating team comes from the contract documents, which explain the scope of work, the quality of the work, the conditions the contractor is expected to meet, the legal requirements of the job, and the schedule of completion. Project Schedule - correct answer A schedule is the tool most commonly used to plan the project step by step. They establish relationships, identify resources needed to complete each task, and highlight the activities that, if late, could jeopardize the overall completion date. They are powerful tools. Project Cost Control - correct answer The estimate servers as a cost baseline for a project, and the schedule serves as the time baseline. The estimate is the tool used to establish the costs on a project. Project Communcation - correct answer Any successful relation, either personal or NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers professional, relies on good communication between the parties. Some communications are formal and some are informal Project Submittals - correct answer Submittals include shop drawings, product literature, samples, reports from independent testing agencies, O&M manuals, and warranties. Technical specifications detail what needs to be submitted, and the general conditions explain the procedure for submitting team. Project, Application for Payment - correct answer Usually the contractor submits monthly requests for payment on a contractor's own form or AIA Document G702. The Role of Contracts - correct answer A contract may be written or oral, but is only formed when there has been a offer to do or provide something that is accepted by another party and is supported by consideration. 1. Offer 2. Acceptance 3. Consideration NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers Fire-resistance rating of structural members, Impact protection - correct answer Fire protective covering shall be protected by the corner guards or by a substantial jacket or other noncombustible material to height adequate to provide full protection, but not less than 5 feet from the finished floor Fire-resistance rating of structural members, Bottom flange protection - correct answer Fire protection is not required at the bottom flange of lintels, shelf angles and plates, spanning not more than 6 feet 4 inches whether part of the primary structural flame or not, and from the bottom flange of lintels, shelf angles and plates not part of the structural flame, regardless of span Fire-resistance rating of structural members, Temperature - correct answer A minimum ambient and substrate temperature of 40 degrees F shall be maintained during and for minimum of 24 hours after the application of the SFRM Fire-resistance rating - correct answer Shaft enclosures shall have a fire- NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers resistance rating of not less than 2 hours where connecting four stories or more, not less than 1 hour where connecting less than four stories. Fire Protection System, Alarms - correct answer Alarm, supervisory and trouble signals shall be distinctly different and shall be automatically transmitted to an approved supervising station or, when approved by the fire code official, shall sound an audible signal at a constantly attended location. Fire protection system,, Valve supervision - correct answer Fire pump suction, discharge and bypass valves, and isolation valves on the backflow prevention device or assembly shall be supervised open by one of the following methods: 1. Central-station 2. Local signaling service 3. Locking valves open 4. Sealing of valves and approved weekly Means of Egress sizing, Doors - correct answer Doors, when fully opened, shall not reduce the required width by more than 7 inches. Doors in any NASCLA Accredited Exam - JJ Johnson Contractor Seminar Questions And Answers position shall not reduce the required width by more than one-half. Means of Egress Illumination, Illumination level under emergency power - correct answer Emergency lighting facilities shall be arranged to provide initial illumination that is a least an average of 1 footcandle and a minimum at any point of .1 footcandle measured along the path of egress at floor level. Means of Egress, Elevators required - correct answer In buildings where a required accessible floor is four or more stories above or below a level of exit discharge, at least one required accessible means of egress shall be an elevator Means of Egress, Areas of refuge - correct answer Each area of refuge shall be sized to accomodate one wheelchair space of 30 inches by 48 inches for each 200 occupants or portion thereof. Means of Egress: Doors, Gates, and Turnstiles - correct answer Projections into the clear opening width between 34 inches and 80 inches above the floor or ground shall not exceed 4 inches