Structural 01

22 Questions | Total Attempts: 2753

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Structural 01 - Quiz

(from previous board exams)Prepared by:Arch. /EnP. RSGabitan


Questions and Answers
  • 1. 
    A 1000 mm x 25 mm nominal diameter deformed steel bar is subjected to test. The following results were obtained: Actual length is 999mm; actual diameter is 23.5 mm; actual weight is 3.90 kg; yield force = 22,099.13 kgs.; yield stress = 45.02 kg/sq. mm; ultimate force = 31,425.74 kgs.; ultimate stress = 64.02 kg/sq. mm; actual strain = 12%. Judge the quality of the steel bar as per PS standard 681-04.02:1975.
    • A. 

      Nominal diameter of the steel bar, 23.5 mm, is less than the required diameter of 25 mm, thus of poor quality.

    • B. 

      The steel bar is an intermediate steel bar.

    • C. 

      Steel bar results is less than the minimum standard of PS Grade 410 thus may be categorized only as PS Grade 275.

    • D. 

      Steel bar is PS Grade 410 and passes the minimum standard for PS Grade 410 thus of good quality.

  • 2. 
    A brochure of a steel bar manufacturer claims the following specs: Yield strength = 275 MPa; tensile strength = 480 MPa. A sample of a 32 mm x 1000mm long steel bar was cut for sampling with the following test results: Yield stress = 28.54 kg/sq. mm; ultimate stress = 50.55 kg/sq. mm. Judge the actual test result against what is claimed in the brochure and if the test results meet the minimum PS standards.
    • A. 

      The test results surpass the claims on the brochure and surpass PS standards.

    • B. 

      Test results is below the claims in the brochure but passes PS standards.

    • C. 

      The test results are equal to the claim of the brochure.

    • D. 

      Test results is below the claims on the brochure and below the PS standard.

  • 3. 
    What criterion conforms to good construction practice for the earliest time to remove scaffolding for concrete flooring other than early-strength concrete if no anticipated load is expected over poured floor?
    • A. 

      25% of scaffoldings can be removed at the slab area after 21 days of pouring and 100% of scaffolds after 28 days

    • B. 

      50% of scaffoldings can be removed after 14 days of pouring and 100% of scaffolds after 21 days

    • C. 

      50% of scaffoldings can be removed over slab area after 28 days of pouring and 100% of scaffolds after 36 days

    • D. 

      25% of scaffoldings can be removed at the slab area after 14 days of pouring and 100% of scaffolds after 21 days

  • 4. 
    Which of the following concrete handling criterion impairs the quality of concrete? (NSCP Sec. 5.5.10)
    • A. 

      Re-tempering concrete shall not be used and discarded by approved means

    • B. 

      Concrete shall be carried on at such a rate that concrete is at all times plastic and flows readily into spaces between reinforcements

    • C. 

      Concrete that has initially set shall be mixed with new concrete and shall be deposited in the structure with approved means

    • D. 

      Top surfaces of vertically formed lifts shall be generally level.

  • 5. 
    Aggregates should conform to PNS or ASTM standards and must be well-graded for easy workability and method of consolidation are such that the concrete can be poured without honeycomb or voids. What is the nominal maximum size of a coarse aggregate when working spaces between reinforcements for proper bonding? (NSCP Sec. 5.3.3)
    • A. 

      Coarse aggregates shall be no larger than 1/2 the minimum clear spacing between individual reinforcing bars or wires, bundles of bars or prestressing tendons or ducts.

    • B. 

      Coarse aggregates shall be no larger than 5/8 the minimum clear space between individual reinforcing bars or wires, bundles of bars or prestressing tendons or ducts.

    • C. 

      Coarse aggregates shall be no larger than 7/8 the minimum clear space between individual reinforcing bars or wires, bundles of bars or prestressing tendons or ducts.

    • D. 

      Coarse aggregates shall be no larger than 3/4 the minimum clear space between individual reinforcing bars or wires, bundles of bars or prestressing tendons or ducts.

  • 6. 
    What is the minimum concrete cover for primary reinforcement of beams and columns not exposed to earth or weather for precast concrete manufactured under plant control conditions? (NSCP Sec. 5.7.7.2)
    • A. 

      Db but not less than 25mm

    • B. 

      Db but not less than 15mm and need not exceed 40mm

    • C. 

      Db but not less than 20mm and need not exceed 50mm

    • D. 

      Db but not less than 30mm

  • 7. 
    How is a 90 degree bend standard hook for concrete reinforcement constructed? (NSCP Sec. 5.7.1.2)
    • A. 

      90 degree bend plus 10 db extension, at free end of bar

    • B. 

      90 degree bend plus 12 db extension, at free end of bar

    • C. 

      90 degree bend plus 6 db extension, at free end of bar

    • D. 

      90 degree bend plus 4 db extension, at free end of bar

  • 8. 
    Which is NOT among the following arrangement, a seismic requirement for transverse reinforcement? (NSCP Sec. 5.21.9.4.2)
    • A. 

      Maximum spacing of hoops shall not exceed 24 times the diameter of the hoop bars

    • B. 

      Maximum spacing of hoops shall not be 8 times the diameter of the smallest longitudinal bars

    • C. 

      Maximum spacing of hoops shall not be more than d/4.

    • D. 

      The first hoop shall be located not more than 75mm from the face of the supporting member.

  • 9. 
    What is the minimum inside diameter of a standard hook for stirrups and ties for a 16m bar and smaller in diameter?(NSCP Sec. 5.7.2.2)
    • A. 

      8 db

    • B. 

      6 db

    • C. 

      4 db

    • D. 

      10 db

  • 10. 
    Which of the following criteria for bundled bars do NOT apply?
    • A. 

      Bars larger than 32mm shall not be bundled in beams.

    • B. 

      Bundle bars shall be enclosed within stirrups or ties.

    • C. 

      Group of parallel reinforcing bars bundled in contact to act as a unit shall be limited to three in any one bundle.

    • D. 

      Individual bars within a bundle terminated within the span of flexural members shall terminate at different points with at least 40db staggered.

  • 11. 
    Which of the following criterion precludes good construction practice for conduits and pipes embedded in concrete? (NSCP Sec. 5.6.3)
    • A. 

      Conduits and pipes embedded in slab, the wall or beam shall not be larger in outside dimension than 1/3 the overall thickness of slab, wall or beam in which they are embedded.

    • B. 

      Reinforcement with an area not less than 0.002 times the area of cross section shall be provided normal to piping.

    • C. 

      Conduit and pipes, with their fittings, embedded within a column, shall not displace more than 5% of the area of the cross section on which strength is calculated.

    • D. 

      Concrete cover for pipes, conduits and fittings, shall not be less than 40mm for concrete exposed to earth or weather.

  • 12. 
    What is a steel element such as wire, cable, bar, rod or strand or a bundle of such elements, used to impart prestress to concrete? (NSCP Sec. 5.2.1)
    • A. 

      Prestress cables

    • B. 

      Reinforcement

    • C. 

      Tenon cables

    • D. 

      Tendons

  • 13. 
    As a seismic requirement for flexural members where hoops are required, how are the remaining portions of a beam treated with transverse reinforcement as minimum requirement other than those required with hoops? (NSCP Sec. 5.21.3.3.4)
    • A. 

      Where hoops are not required, stirrups shall be spaced at no more than d/2 throughout the length of the member.

    • B. 

      Where hoops are not required, cross ties shall be spaced at no more than d/3 throughout the length of the member.

    • C. 

      Where hoops are not required, hoops shall continue except that spacing shall not be more than d/2.

    • D. 

      Where hoops are not required, closed stirrups shall be spaced at no more than d/4 throughout the length of the member.

  • 14. 
    What is a material other than water, aggregate or hydraulic cement, used as an ingredient of concrete and added to concrete before or during its mixture to modify its properties? (NSCP Sec. 5.2.1)
    • A. 

      Admixture

    • B. 

      Steam

    • C. 

      Plasticizer

    • D. 

      Retarder

  • 15. 
    What is the act of excavating or filling of earth or any sound material or combination thereof, in preparation for a finishing surface such as paving?
    • A. 

      Cut and fill

    • B. 

      Grading

    • C. 

      Site preparation

    • D. 

      Benching

  • 16. 
    What are piles placed at an inclination to resist forces that are not critical?
    • A. 

      Guide piles

    • B. 

      Batter piles

    • C. 

      Slope piles

    • D. 

      Fender piles

  • 17. 
    What is a concrete beam placed directly on the ground to provide foundation for the superstructure?
    • A. 

      Strap beam

    • B. 

      Gerber beam

    • C. 

      Grade beam

    • D. 

      Tie beam

  • 18. 
    What is a method of analyzing indeterminate modular building frames by assuming hinges at the center of beam spans and column heights?
    • A. 

      Cantilever method

    • B. 

      Moment distribution method

    • C. 

      Fee body diagram method

    • D. 

      Portal method

  • 19. 
    What is a round, steel bolt embedded in concrete or masonry used to hold down masonry, steel columns, or beam casting, shock beam plates and engine heads?
    • A. 

      Retaining bolts

    • B. 

      Foundation bolts

    • C. 

      Anchor bolts

    • D. 

      Friction bolts

  • 20. 
    Good high-strength bolted connection for steel should have the following physical characteristics for good workmanship. Which in the following list is NOT ideal? (NSCP Sec. 4.23.5)
    • A. 

      High-strength bolted parts shall fit solidly together when assembled and shall not be separated by gaskets or any other interposed compressive material.

    • B. 

      Bolts tightened by means of a calibrated wrench shall be installed with a hardened washer under the nut or bolt head whichever is the element turned in tightening.

    • C. 

      When assembled, all joint surfaces, including those adjacent to the washer, shall be free of scale, except tight, dirts, and burns.

    • D. 

      Surface in contact with the bolt head and nut head shall have a slope of not more than 1:10 with respect to a plane normal to the bolt axis.

  • 21. 
    Which of the following criterion is NOT applicable for plug and slot welds?
    • A. 

      The thickness of plug or slot welds in material 16mm or less in thickness shall be equal to the thickness of the material.

    • B. 

      The minimum center to center spacing in a longitudinal direction of any line shall be 2 times the length of the slot.

    • C. 

      The thickness of plug or slot welds in material over 16mm in thickness shall be at least 1/2 the thickness of the material but not less than 16mm.

    • D. 

      D. The width of the slot shall not be less than the thickness of the parts containing it plus 10mm nor 2 1/4 times the thickness of the weld.

  • 22. 
    How is a camber treated in a steel truss 25 meters or longer?
    • A. 

      Camber shall be approximately equal to 1% of the span.

    • B. 

      Camber shall be approximately equal to the dead load deflection.

    • C. 

      Camber shall be approximately equal to 0.8% of the span plus 1/3 the dead load deflection.

    • D. 

      Camber shall be approximately equal to 0.5% of the span plus 1/3 the live load deflection.

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