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94 Cards in this Set
- Front
- Back
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1. Which of the following statements regarding the properties of wood are MOST accurate? |
B. Wood is never dimensionally true
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2. On the basis of strength to unit weight, wood has a tensile strength compared to:
A. masonry B. concrete C. precast concrete D. steel |
D. steel
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3. Which form of lumber includes boards, dimension lumber, and timbers?
A. solid lumber B. panels C. laminated members D. manufactured components |
A. solid lumber
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4. Which of the following statements regarding solid lumber is MOST accurate?
A. dimension lumber is available in lengths from 6 to 16 feet B. Differences between the actual and nominal dimensions are the result of variations in machinery used to cut a log into rough lumber C. the actual dimension of a finished piece of wood will be larger than the nominal dimension D. dimension lumber used as rafters can be supplied in lengths up to 20 feet |
B. Differences between the actual and nominal dimensions are the result of variations in machinery used to cut a log into rough lumber
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5. The structural composite lumber that is the strongest and is used for heavily loaded columns and long spans is:
A. laminated veneer lumber B. parallel strand lumber C. laminated strand lumber D. parallel veneer lumber |
B. parallel strand lumber
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6. Which of the following statements regarding span rating is MOST accurate?
A. the span rating indicates the difference in the amount of support and load-carrying capability between roof construction and floor construction. B. the grade stamp indicates a wood panel's suitability for exposure to cold. C. the span rating is indicated in three numbers stamped on the back of the panel D. greater distances typically exist between supporting members of floors than roofs |
A. the span rating indicates the difference in the amount of support and load-carrying capability between roof construction and floor construction.
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7. A truss that is made up of members 8 to 10 inches and used mainly for its appearance is a __ truss.
A. light-frame timber B. heavy-timber C. split ring D. box beam |
B. heavy-timber
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8. A truss made up of members all in the same plane and used for roof framing with small or moderate spans is a __ truss.
A. light-frame timber B. heavy timber C. split ring D. box beam |
A. light-frame timber
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9. Which of the following statements regarding light-frame wood trusses is MOST accurate?
A. light-frame trusses are made up of 6 inch nominal members all in the same plane B. light-frame trusses frequently use steel gusset plates with through-bolts at connection points C. light-frame trusses are popular for floor joists where spans are moderate D. light-frame trusses will fail earlier in a fire than members used in the past. |
D. light-frame trusses will fail earlier in a fire than members used in the past.
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10. The process of thermal decomposition of wood is known as:
A. pyrolysis B. heat of combustion C. deflagration D. decay |
A. pyrolysis
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11. The ___ of a fuel is the total amount of thermal energy that could be released if the fuel were completely burned.
A. burning capacity B. heat of combustion C. latent heat D. potential combustibility |
B. heat of combustion
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12. Which of the following statements regarding fire-retardant treatment of wood is MOST accurate?
A. the fire retardant is intended to occur at temperatures lower than those developed in fires. B. the fire retardant is intended to occur at temperatures higher than those developed in fires C. all chemicals used as fire retardants can be used for exterior applications D. fire retardant treatment of wood increases its strength |
A. the fire retardant is intended to occur at temperatures lower than those developed in fires.
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13. Most fire-retardant chemicals operate by:
A. accelerating the absorption of moisture toe extinguish flame spread B. combining chemicals with air to eliminate the air supply C. accelerating the formation of charring in the wood D. increasing the formation of volatile gases |
C. accelerating the formation of charring in the wood
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14. Wood structures are usually not built taller than __ stories because of economical considerations.
A. two B. three C. four D. five |
B. three
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15. From a fire fighting standpoint, what is the advantage of the exposed wood framing in heavy-timber and post-and-beam construction?
A. visibility of structural deterioration B. easier reapplication of fire-proofing materials C. higher combustion temperatures of exposed surfaces D. elimination of combustible voids |
D. elimination of combustible voids
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16. In __ construction, the exterior wall studs are continuous from the foundation to the roof.
A. balloon framing B. platform framing C. post-and-beam framing D. heavy-timber framing |
A. balloon framing
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17. Which of the following areas would be required by building code to have fire stopping in place?
A. outside stud walls at the ceiling level B. in front of soffits C. On top of studs in a platform-frame building D. between stair stringers |
D. between stair stringers
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18. The use of combustible insulation increases the possibility of a fire starting within a wall due to:
A. the use of gypsum board as a facing B. an air space between the foam and the wall surface C. the potential of an electrical malfunction in the wall D. lack of air space between the foam and the studs |
C. the potential of an electrical malfunction in the wall
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19. Which of the following statements regarding loose-fill material used for insulation is MOST accurate?
A. loose wool insulation is treated with water-soluble salts to reduce combustibility B. cellulose fiber insulation is noncombustible C. fire in shredded wood insulation treated to reduce combustibility will burn in a slow, smoldering manner. D. it is not necessary to open walls insulated with noncombustible insulation when fighting fires in a wood-frame building |
C. fire in shredded wood insulation treated to reduce combustibility will burn in a slow, smoldering manner.
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20. Which of the following statements regarding brick veneer is MOST accurate?
A. brick veneer adds to the thermal insulating value of the exterior wall B. there is a significant difference in fire behavior between a brick veneer building and an ordinary wood-frame building C. brick veneer adds considerable structural support to a building D. brick veneer walls can be identified visually by their header course |
A. brick veneer adds to the thermal insulating value of the exterior wall
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21. A typical means of achieving a one-hour fire resistance for Type V-A construction is to attach a __ inch gypsum board attached to the studs and ceiling joists.
A. 1/4 B. 1/2 C. 3/8 D. 5/8 |
D. 5/8
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22. Which of the following statements regarding impact-resistant gypsum board is MOST accurate?
A. both regular and impact-resistance gypsum board is easily penetrated with hand tools B. impact-resistant gypsum board is produced with fiberglass mesh C, impact-resistant gypsum board is normally used in single-dwelling occupancies D. impact-resistant gypsum board is easily differentiated from regular gypsum board |
B. impact-resistant gypsum board is produced with fiberglass mesh
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23. Which of the following is MOST likely to contribute to rapid structural failure in a wood-frame dwelling?
A. gypsum board interior walls B. concrete basement floor C. plywood subfloor covered with carpet D. finished floor over a basement space |
C. plywood subfloor covered with carpet
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24. Which of the following statements regarding ignition-resistant construction is MOST accurate?
A. requirements for ignition-resistant construction are the same regardless of jurisdiction or area B. the national fire protection association publishes the "international wildland-urban interface code" C. ignition-resistant requirements include a three-hour fire resistive rating when exposed from the outside D. ignition-resistant construction is intended to decrease vulnerability of structures to exposure from wildland fires |
D. ignition-resistant construction is intended to decrease vulnerability of structures to exposure from wildland fires
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1. The hardness of brick depends on the:
A. length of drying time B. temperature of the kiln C. soil used it its composition D. length of the firing |
C. soil used it its composition
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2. Which of the following statements regarding concrete blocks is MOST accurate?
A. concrete blocks are also known as concrete molded units B. hollow concrete blocks are produced only in an 8x8x16 inch size C. Hollow concrete blocks can be filled with material to add strength to a wall D. concrete blocks are more costly to use than bricks |
C. Hollow concrete blocks can be filled with material to add strength to a wall
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3. The most commonly used concrete block is the:
A. hollow concrete block B. solid concrete block C. brick. D. foam insulated concrete block |
A. hollow concrete block
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4. Which of the following is a characteristic of masonry construction
A. high tensile strength B. high compressive strength C. collapse resistant D. combustible |
B. high compressive strength
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5. the primary function of mortar is to:
A. cushion the rough surfaces of the masonry B. provide a seal between masonry units C. improve the appearance of the wall D. bond the masonry units into a solid mass |
D. bond the masonry units into a solid mass
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6. Which of the following statements regarding mortar is MOST accurate?
A. The mortar is the strongest part of the wall B. mortar has a greater compressive strength than the individual masonry units C. Master streams used during a fire can weaken mortar D. Masonry construction that has sand-lime mortar should be repaired with the newer mortar containing portland cement |
C. Master streams used during a fire can weaken mortar
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7. The minimum thickness of a masonry supporting wall is __ inches
A. 6 B. 8 C. 10 D. 12 |
A. 6
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8. A vertical layer of bricks made by laying horizontal layers of bricks on top of each other is known as a:
A. course B. leader C. header D. wythe |
D. wythe
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9. Which of the following statements regarding nonreinforced masonry walls is MOST accurate?
A. multiple wythes are rarely used to provide strength and stability in a nonreinforced masonry wall B. A concrete block wythe is commonly used in conjunction with a gypsum block wythe in nonreinforced masonry walls C. Horizontal bonding between wythes can be accomplished using corrosion-resistant metal ties D. A cleft wall is an opening between the exterior and interior wythes to prevent water seepage through the mortar joints |
C. Horizontal bonding between wythes can be accomplished using corrosion-resistant metal ties
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10. When bricks used to construct a masonry wall are placed vertically on end, they create a __ course.
A. header B. stretcher C. soldier D. leader |
C. soldier
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11. Which of the following statements regarding lintels is MOST accurate?
A. Lintels are used to support two or more floors of masonry walls in a showroom with large windows B. A lintel over a garage door opening would only need to support the weight of a triangular section above the door C. lintels are frequently made of wood D. lintels are used over openings in masonry walls because the mortar joints provide little tensile strength |
D. lintels are used over openings in masonry walls because the mortar joints provide little tensile strength
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12. Which of the following statements regarding parapets is MOST accurate?
A. parapets are used only to provide a barrier to fire spread between closely spaced buildings B. parapets have lateral supports on all sides C. artificial parapets may be indistinguishable from masonry parapets D. Codes require all parapets to be constructed of masonry |
C. artificial parapets may be indistinguishable from masonry parapets
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13. Which of the following statements regarding masonry structure is MOST accurate?
A. basic masonry construction is also known as ordinary construction B. the most basic masonry structure consists of exterior non-load-bearing masonry walls C. Traditional masonry structure is classified as Type IV construction D. the live loads of a traditional masonry building are transferred to the bearing walls through posts and beams |
A. basic masonry construction is also known as ordinary construction.
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14. Which of the following statements regarding interior framing in masonry buildings is MOST accurate?
A. the presence of an exterior masonry wall means a building is ordinary construction B. masonry walls will only be encountered in non-fire-resistive buildings C. Interior framing of wood-joisted buildings will have an interior finish that provides required fire resistance D. masonry construction does not have concealed combustible voids. |
C. Interior framing of wood-joisted buildings will have an interior finish that provides required fire resistance
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15. A building with masonry exterior walls and interior framing members that are noncombustible and unprotected would be classified as a __ building.
A. type I-B B. type II-B C. Type III D. Type IV |
B. type II-B
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16. Which of the following statements regarding the fire resistance of masonry buildings is MOST accurate?
A. masonry walls will not collapse under fire if they are constructed with fire-rated concrete units B. if a masonry wall collapses, it will fall out from a building a distance at least equal to its height C. structural deterioration that occurred before a fire has no effect on the potential for structural failure under fire conditions D. If a masonry wall begins to bulge out, it will tend to push into the interior framing |
B. if a masonry wall collapses, it will fall out from a building a distance at least equal to its height
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17. which of the following statements regarding false fronts on buildings is MOST accurate?
A. all false fronts are known as mansards B. A false front is rarely found on masonry buildings C. a false front can create a combustible void D. building codes strictly regulate false fronts |
C. a false front can create a combustible void
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18. Mill construction is commonly known as __ construction.
A. heavy-timber wood-frame B. heavy-timber C. ordinary masonry D. masonry wood-joisted |
B. heavy-timber
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19. Which of the following statements best describes the difference between mill construction and type III construction?
A. combustible concealed spaces are not permitted in mill construction B. the minimum dimensions of the wood structural embers is smaller for mill construction than type III construction C. Type III constructon relies on the inherent fire resistance of the lumber used D, roofs of mill constructed buildings are constructed of wood joists and rafters |
A. combustible concealed spaces are not permitted in mill construction
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20. the nonbearing interior partitions of mill constructon are required to be not less than two layers of __-inch matched boards
A. 1 B. 2 C. 3 D. 4 |
A. 1
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1. The addition of __ to steel will increase its resistance to abrasion.
A. molybdenum B. vanadium C. carbon D. manganese |
D. manganese
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2. Cast iron differs from steel in that it:
A. has a higher carbon content B. has a lower carbon content C. is stronger than steel D. can be rolled into various shapes |
A. has a higher carbon content
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3. Which of the following statements regarding ductility is MOST accurate?
A. the difference in ductility between steel and cast iron is the result of a higher carbon content in steel B. steel can only be rolled at extremely high temperatures C. hot-rolled steel is used for members with thin cross-sections D. steels with higher yield points have less ductility |
D. steels with higher yield points have less ductility
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4. The point at which steel breaks is known as the __ stress.
A. fracture B. breach C. critical D. ultimate |
D. ultimate
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5. Which of the following statements regarding deterioration of steel at elevated temperatures is MOST accurate?
A. typical fires generate enough heat to melt steel B. some degree of failure of unprotected steel should be anticipated with temperatures of a typical fire C. steel loses its strength quickly at a temperature of 1000 degrees F. D. failure of unprotected steel depends solely on the intensity of the exposing fire |
C. steel loses its strength quickly at a temperature of 1000 degrees F.
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6. Which of the following statements regarding the effect of mass on the speed at which steel will fail is MOST accurate?
A. Bar joists will fail earlier than massive steel beams B. real fires do not need to generate as much heat as the calculated theoretical heat to cause steel failure C. The smaller the mass of steel, the more heat necessary to result in failure D. Massive steel beams frequently show deformation in typical fires |
A. Bar joists will fail earlier than massive steel beams
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7. Which of the following statements regarding how the type of connection used to join members affects the behavior of steel under fire conditions is MOST accurate?
A. rigid connections exert a resistance to deformation of individual members B. Simply supported members are better able to resist failure C. Rigid connections allow connected members to expand with increasing temperatures D. Use of simple supports results in large forces being exerted against adjacent members |
A. rigid connections exert a resistance to deformation of individual members
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8. Which of the following statements regarding the heating of steel is MOST accurate?
A. the top and ends of a steel beam will heat faster than the bottom of the beam B. yielding and deformation occur uniformly over the length of the beam C. yielding and thermal expansion occur simultaneously D. thermal expansion is the MOST significant concern for firefighters |
C. yielding and thermal expansion occur simultaneously
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9. The type of frame designed to resist bending forces resulting from supported loads and lateral forces is a __ frame.
A. simple B. semi-rigid C. rigid D. girder |
C. rigid
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10. Which of the following statements regarding methods used to provide lateral stability for a frame is MOST accurate?
A. Shear panels are located between columns and beams to brace them laterally B. Shear panels are nonreinforced walls installed to provide lateral support C. a rigid frame requires additional diagonal bracing for stability D. a shear wall should extend from the foundation to the roof of the building |
D. a shear wall should extend from the foundation to the roof of the building
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Trusses that are frequently used in three-dimensional space frames are known as __ trusses.
A. open web B. bar joist C. delta D. joist girder |
C. delta
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12. The top ridge of a gabled rigid frame is known as the:
A. gable B. crown C. cap D. peak |
B. crown
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13. Which of the following statements regarding gabled rigid frames is MOST accurate?
A. the top ridge of a gabled rigid frame is designed as a semi-rigid joint B. the vertical members of a gable rigid frame are designed as rigid joints C. structures with gabled rigid frames are used for the construction of two-story industrial buildings D. gabled rigid frame structures must be braced diagonally |
D. gabled rigid frame structures must be braced diagonally
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14. Steel cables and wire are subject to __, so are limited to the support of tension forces
A. bending B. buckling C. fracture D. snapping |
B. buckling
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15. Which of the following statements regarding steel columns is MOST accurate?
A because of low compressive strength, the cross-section of steel columns can be small compared to their length B. The possibility of a steel column buckling is due to the alloys contained in the column C. columns that cannot rotate at their ends are less likely to buckle than columns that are free to rotate at their ends D. the possibility of buckling is less with steel columns than with columns made of other materials |
C. columns that cannot rotate at their ends are less likely to buckle than columns that are free to rotate at their ends
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16. The corrugated steel decking used to support lightweight concrete floors in steel frame buildings is supported by:
A. open-web joists B. rods C. light-gauge joists D. beams |
A. open-web joists
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17. a steel web used in conjunction with rigid connections in beam and girder frames and heavy trusses is a:
A. simple mesh B. gusset plate C. web plate D. pivot web |
B. gusset plate
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18. which of the following statements regarding light-gauge steel sheeting is MOST accurate?
A. light-gauge sheeting has a small surface-to-mass ratio B. light-gauge sheeting heats slowly under fire conditions C. light-gauge sheeting heats unevenly under fire conditions D. light-gauge sheeting will not melt under fire conditions |
D. light-gauge sheeting will not melt under fire conditions
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19. which of the following components of gypsum enhances its performance as a fire-insulating material?
A. calcinated gypsum B. water C. starch D. paper facing |
B. water
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20. mineral fibers that can endure conditions that might exist in parking facilities have a density greater than __ lbs/cu ft
A. 20 B. 30 C. 40 D. 50 |
A. 20
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21. intumescent materials expand to __ times their original volume when exposed to the heat of a fire
A. 5 to 10 B. 10 to 25 C. 15 to 30 D. 25 to 40 |
C. 15 to 30
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22. which of the following statements regarding intumescent and mastic coatings is MOST accurate?
A. the charring that occurs when intumescent coatings are exposed to the heat of a fire acts as the insulating material for the steel B. intumescent coatings are applied in a thickness greater than the thickness of SFRMs C. both mastic and intumescent coatings are more visually appealing and less expensive than SFRMs D. mastic coatings have a more complex reaction to the heat of a fire than intumescent coatings |
D. mastic coatings have a more complex reaction to the heat of a fire than intumescent coatings
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23. Which of the following materials used to insulate steel are especially popular where surface appearance is NOT important?
A. metal lath and plaster B. sprayed-on cemetitious coating C. multiple layers of gypsum board D. mineral and fiberboards |
A. metal lath and plaster
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24. Which of the following statements regarding suspended ceilings is MOST accurate?
A. suspended ceilings can provide a floor and ceiling assembly with a fire rating of two to four hours B. removal of any part of a suspended ceiling reduces the fire resistance of the total assembly C. ceiling materials are rated independently from the assembly D. penetrations of a suspended ceiling do not affect its fire rating |
B. removal of any part of a suspended ceiling reduces the fire resistance of the total assembly
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25. one code modification allows the elimination of the fire-resistance rating for roof construction located more than __ feet above the floor below for some occupancies
A. 15 B. 20 C. 25 D. 27 |
B. 20
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Which of the following statements regarding concrete production is MOST accurate?
A. the course aggregate in concrete is sand B. the fine aggregate in concrete is gravel C. portland cement makes up the majority of concrete D. the cement combines with water to form a paste that bonds the aggregates |
D. the cement combines with water to form a paste that bonds the aggregates
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2. Which of the following statements regarding the curing of concrete is MOST accurate?
A. a covering of plastic film can keep concrete moist B. concrete initially hardens slowly C. Air-cured concrete produces a stronger concrete D. Moist-cured concrete negatively affects the finished surface |
A. a covering of plastic film can keep concrete moist
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3. Concrete cured at a temperature above __ will not reach proper strength
A. 70 degrees B. 80 degrees C. 90 degrees D. 100 degrees |
D. 100 degrees
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4. Concrete mixtures with varied ingredients or chemical additives are generally known as:
A. byproducts B. admixtures C. compounds D. conglomerates |
B. admixtures
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5. Concrete adheres to reinforcing bars when it is has hardened because of:
A. chemicals added to the concrete B. the coating applied to the rebar C. deformations on the surface of the rebar D. mechanical vibrators packing concrete entirely around the rebar |
C. deformations on the surface of the rebar
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6. The PRIMARY reason for placing reinforcing steel in concrete is to:
A. support compressive forces B. resist compressive forces C. resist tensile forces D. resist bending forces |
C. resist tensile forces
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7. Large loads applied along the axis of a beam can result in:
A. stretching of the concrete B. shortening of the steel C. increasing the compressive force D. loss of load-carrying capacity |
D. loss of load-carrying capacity
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8. Which of the following statements regarding pretensioning of concrete is MOST accurate?
A. steel strands are tensioned after the concrete has reached a certain strength B. as force on the steel strands is released, the strands exert a tensile force in the concrete C. when the steel strands are released, the concrete member usually takes on a slight downward deflection D. as loads are applied to the pretensioned member, it becomes flat |
D. as loads are applied to the pretensioned member, it becomes flat
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9. Which of the following statements regarding steel used to prestress concrete is LEAST accurate?
A. The forces that are produced in the prestressing process remain locked in the steel for 50 years B. postensioned steel is not bonded to the concrete so it is dangerous to cut through with a saw or torch C. When cut, postensioned steel can spring out of the concrete resulting in injuries to those nearby D. cutting through reinforcing steel can lead to failure of the concrete element |
A. The forces that are produced in the prestressing process remain locked in the steel for 50 years
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10. Which of the following statements regarding cast-in-place concrete is MOST accurate?
A. poor quality concrete results if proper techniques are not used at each step. B. cast-in-place concrete has a higher degree of quality control that precast concrete C. the designer is limited to certain shapes and sizes with cast-in-place concrete D. cast-in-place concrete allows for errors in mixing, placing, and curing |
A. poor quality concrete results if proper techniques are not used at each step.
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11. The quality control test used to check moisture content of concrete is known as the __ test.
A. compression B. slump C. sag D. density |
B. slump
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12. The quality control test for concrete that requires the concrete to harden before results are known is the __ test.
A. compression B. slump C. sag D. density |
A. compression
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13. Which of the following statements regarding the quality control tests used on concrete is MOST accurate?
A. if concrete is unsatisfactory, it will not settle during the slump test B. the sag test checks the amount of aggregate in the cement C. the compression test is very costly if the results are unsatisfactory D. the density test is preferred over the slump test because of its convenience |
C. the compression test is very costly if the results are unsatisfactory
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14. In flat-slab concrete frames, the stresses that develop in the concrete where the slab intersects the supporting columns are __ stresses.
A. tension B. shear C. compression D. torsional |
B. shear
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15. Which of the following is an extremely light cast-in-place framing system?
A. flat-slab B. waffle C. slab and beam D. flat plate |
C. slab and beam
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16. The cast-in-place framing system that uses square forms over which wet concrete is poured to eliminate weight of unnecessary concrete is the :
A. flat-slab B. waffle C. slab and beam D. flat plate |
B. waffle
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17. Which of the following statements regarding quality control of precast concrete is MOST accurate?
A. precasting forms are located in areas exposed to weather B. mixing and pouring of precast concrete can be more mechanized than cast-in-place concrete C. mixing and pouring precast concrete is less efficient than mixing and pouring cast-in-place concrete D. quality control tests done onsite provide a higher degree of quality control than precast concrete |
B. mixing and pouring of precast concrete can be more mechanized than cast-in-place concrete
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18. Precast solid slabs are used for spans up to approximately __ feet
A. 30 B. 60 C. 100 D. 120 |
D. 120
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19. Which of the statements regarding tilt-up walls is MOST accurate?
A. reinforced wall panels are cast in horizontal casting beds and transported to the job site B. tilt-up walls are used for a maximum of two stories C. tilt-up walls can support only timber beam and steel truss roofs D. failure of a roof supported by tilt-up walls results in outward horizontal forces against the walls |
D. failure of a roof supported by tilt-up walls results in outward horizontal forces against the walls
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20. When precast slabs simply rest on bearing walls, the slabs need to be tied together laterally to resist __ forces.
A. vertical B. horizontal C. compressive D. torsional |
B. horizontal
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21. Which of the following statements regarding identification of concrete systems is MOST accurate?
A. it is easy to determine if a frame is constructed with ordinary reinforcing or posttensioned reinforcing by inspecting the ends of beams B. differentiating cast-in-place concrete from precast concrete can be determined after a building is complete by examining the connections of exposed members C. some building systems may appear to be concrete when they are not D. fire personnel can determine the type of concrete system used by checking building codes |
C. some building systems may appear to be concrete when they are not
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22. Which of the following statements regarding the performance of concrete under fire conditions is MOST accurate?
A. ordinary reinforced concrete is somewhat more vulnerable to failure than prestressed concrete systems B. the steel used to reinforce concrete must be protected to reach a fire rating equivalent to that required for the concrete C. concrete structural systems can have a fire resistance rating from two to six hours D. fire resistance ratings of a concrete assembly can be affected by concrete density and the load it must support |
22. Which of the following statements regarding the performance of concrete under fire conditions is MOST accurate?
A. ordinary reinforced concrete is somewhat more vulnerable to failure than prestressed concrete systems B. the steel used to reinforce concrete must be protected to reach a fire rating equivalent to that required for the concrete C. concrete structural systems can have a fire resistance rating from two to six hours D. fire resistance ratings of a concrete assembly can be affected by concrete density and the load it must support |
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23. Which of the following statements regarding lightweight concrete is MOST accurate?
A. ordinary concrete acts as a better insulator than structural lightweight concrete of comparable thickness B. structural lightweight concrete has a higher thermal conductivity than ordinary concrete C. structural lightweight concrete can be used for load-bearing members D. structural lightweight concrete has a lower density than ordinary concrete |
D. structural lightweight concrete has a lower density than ordinary concrete
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24. Which of the following statements regarding spalling is MOST accurate?
A. concrete has significant resistance to tension B. spalling causes concrete to crack laterally under fire conditions C. spalling can result in exposure of reinforcing steel under fire conditions D. concrete that is not completely cured is subject to less severe spalling when exposed to fire than concrete that has aged |
C. spalling can result in exposure of reinforcing steel under fire conditions
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25. Which of the following statements regarding the heat-sink effect is MOST accurate?
A. the heat-sink effect can make conditions uncomfortable, but cannot reignite combustibles B. the heat-sink effect can cause deadly reignition of combustibles during overhaul C. the heat-sink effect causes concrete to release retained heat quickly D. the heat-sink effect does not apply to newer concrete |
A. the heat-sink effect can make conditions uncomfortable, but cannot reignite combustibles
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