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Question 1 of 70
1. Air voids generally larger than one millimeter which are not usually produced by the intentional use of an air entraining agent.
Question 2 of 70
2. Degree of workability is dependent on :
Question 3 of 70
3. The most important factor of concrete proportioning that affect the strength of concrete.
Question 4 of 70
4. This type of cement is especially suited to improve the workability with smaller water-cement ratio and to improve frost resistance of concrete.
Question 5 of 70
5. Equipment used in the consolidation of fresh concrete.
Question 6 of 70
6. Large Maximum Sizes of well-grade aggregates have less voids than smaller sizes. Hence, concrete with larger sized aggregates require. less mortar per unit volume of concrete. The maximum size of aggregate should be the largest economically available and consistent with the dimension of the structure. ACI 3.3.2 – Nominal maximum size of coarse aggregate in a concrete mix shall be not larger than:
Question 7 of 70
7. By an approved procedure admixture is added to each batch of concrete either of by weight or volume. What is the accuracy of measurement of admixtures into the mixer.
Question 8 of 70
8. Which is true on conducting of a slump test?
Question 9 of 70
9. A type of cement recommended for use in marine structures, sewage works, sewage works and for laying concrete under water such as bridges, piers, dams and mass concrete works.
Question 10 of 70
10. The approximate volume of cement in a concrete mix?
Question 11 of 70
11. Factors affecting the amount of water in the mixture:
Question 12 of 70
12. The minimum flexural strength requirement of beam sample when tested by the third point of loading method.
Question 13 of 70
13. Factors affecting the amount of water in the mixture:
Question 14 of 70
14. The measurement of materials for making concrete
Question 15 of 70
15. The quality of concrete is largely dependent upon ________________.
Question 16 of 70
16. This cement has increased power against sulphates and is less reactive and initial setting time is greater than Ordinary Portland Cement.
Question 17 of 70
17. Slump test on concrete is to measure _______________.
Question 18 of 70
18. ACI 318-08: 5.8.3 For a job-mixed concrete, mixing shall be continued for at least ____________ seconds after all materials are in the drum, unless a shorter time is shown to be satisfactory by the mixing uniformity tests of “Specification for Ready-Mixed Concrete” (PNS/ASTM C 94).
Question 19 of 70
19. The process of maintaining sufficient moisture and favorable temperature in concrete.
Question 20 of 70
20. The strength of concrete is principally dependent on.
Question 21 of 70
21. A hydraulic cement produced by pulverizing clinker consisting essentially of hydraulic calcium silicates, and usually containing calcium sulfate. It is most widely used type of cement which is suitable for all general concrete construction.
Question 22 of 70
22. Because the paste surrounds and separates the individual aggregate particles in concrete, which one does not contribute largely to the strength of the concrete?
Question 23 of 70
23. Air bubbles generally smaller than one millimeter incorporated in cement mortar during mixing, usually produced by the intentional use of an air-entraining agent.
Question 24 of 70
24. Batching tolerance for Aggregates.
Question 25 of 70
25. Which of the following is true on conducting a slump test?
Question 26 of 70
26. When consolidating concrete during pouring operations, vibrator should not be operated in any one location longer than ___________.
Question 27 of 70
27. Attains high strength in early days. It is used in concrete where formworks are removed at an early stage. It is used in prefabricated concrete and road works construction.
Question 28 of 70
28. The ease in placing concrete without segregation into the final position where it is allowed to harden.
Question 29 of 70
29. The additive used in mixing concrete.
Question 30 of 70
30. For batch mixing at the site of construction or at a central point, the flow of water shall be uniform and all water should be in the drum by the end of the first ____________ seconds of the mixing period.
Question 31 of 70
31. Which of the following is not a chemical admixture for concrete?
Question 32 of 70
32. To attain a uniform consistency of concrete during the pouring operation of a concrete pavement if vibrated, the slump should not be more than:
Question 33 of 70
33. Generally speaking, batching of concrete by volume is preferable than weight.
Question 34 of 70
34. Concrete (other than high-early strength) shall be maintained above 10°C and in a moist condition for at least the first how many days after placement
Question 35 of 70
35. When batches are hauled to the mixer, bulk cement shall be transported either in waterproof compartments or between the fine and coarse aggregate. When cement is placed in contact with moist aggregates, batches will be rejected unless mixed within __________ of such contact.
Question 36 of 70
36. What is that state where the paste loses its fluidity and within a few hours a noticeable hardening occurs.
Question 37 of 70
37. The minimum flexural strength requirement of beam sample when tested by midpoint method.
Question 38 of 70
38. Type of concrete recommended for use where works is to be completed in very short period and for concreting in static or running water.
Question 39 of 70
39. A test to determines the consistency of concrete.
Question 40 of 70
40. The additive used in mixing concrete.
Question 41 of 70
41. For small project where quantity of steel bars is 10,000kg or less, what is the basis of acceptance of material?
Question 42 of 70
42. Although bar supports are not concrete reinforcing agents, its use is necessary in __________________________________.
Question 43 of 70
43. Regarding flame-cutting (oxy-acetylene) of reinforcement bars, tests have shown that any effect of flame-cutting is localized to the end-cut surfaces. Only a very short distance, approximately ______ mm from the flame-cut ends is affected.
Question 44 of 70
44. The standard hook for stirrup and tie, No 8 bar and smaller is 135-degree bend plus ______ extension at free end of bar, where db = bar diameter.
Question 45 of 70
45. In concrete, proper coverage of the bars is required to prevent what condition(s) from developing?
Question 46 of 70
46. In spirally reinforced compression members, lap splice length of bars within a spiral shall be permitted to be multiplied by ______, but lap length shall not be less than 12 inches.
Question 47 of 70
47. According to CRSI Manual of Standard Practice (Concrete Reinforcing Steel Institute), which of the following is not an approved type of reinforcement support
Question 48 of 70
48. There is 1-QT RSB required for every .
Question 49 of 70
49. Incorrect reinforcing steel placement can and has led to serious concrete structural failures. For example, lowering the top bars or raising the bottom bars by ½ inch more than that specified in a 6-inch-deep slab could reduce its load-carrying capacity by _________.
Question 50 of 70
50. The standard hook for stirrup and tie, No. 6, No. 7, No. 8, is 90-degree bend plus ______ extension at free end of bar, where db = bar diameter
Question 51 of 70
51. In general, the minimum concrete cover for primary reinforcement of concrete not exposed to weather or in contact with the ground should be:
Question 52 of 70
52. When bars of different size are lap spliced in compression, splice length shall be the larger of ldc of larger bar and compression lap splice length of smaller bar. Lap splices of ______________ and smaller bars shall be permitted.
Question 53 of 70
53. In walls and slabs other than concrete joist construction, primary flexural reinforcement shall not be spaced farther apart than three times the wall or slab thickness, nor farther apart than ____________.
Question 54 of 70
54. A tie bar should be .
Question 55 of 70
55. PNS 49:1986, has the dash or number marked on reinforcing bars signifying the grade (tensile strength), which grade of reinforcement that has no dash in it?
Question 56 of 70
56. Trial fabrication subject for approval by an authorized representative prior to mass production.
Question 57 of 70
57. In footings between the ground and steel, what minimum thickness of concrete cover, in inches, should be provided?
Question 58 of 70
58. A full mechanical splice shall develop in tension or compression, as required, at least __________ of the bar.
Question 59 of 70
59. Lap splices shall not be used for bars larger than __________.
Question 60 of 70
60. A dowel bar should be .
Question 61 of 70
61. PNS has the Color Code painted on the surface of the ends of each bar signifying its grade (tensile strength). White-Grade 230, Yellow-Grade275, Green-Grade 415, weldable bars is signified by what color?
Question 62 of 70
62. Put in sequence the processes involve in fabrication of reinforcement bars.
Reorder
Bundling/tagging
Move "Bundling/tagging" down
Move "Bundling/tagging" up
answer is
Correct
is the
Correct Answer
answer is
Incorrect
Reorder
Marking
Move "Marking" down
Move "Marking" up
answer is
Correct
is the
Correct Answer
answer is
Incorrect
Reorder
Bending
Move "Bending" down
Move "Bending" up
answer is
Correct
is the
Correct Answer
answer is
Incorrect
Reorder
Cutting
Move "Cutting" down
Move "Cutting" up
answer is
Correct
is the
Correct Answer
answer is
Incorrect
Question 63 of 70
63. The standard hook for stirrup and tie, No 5 bar and smaller is 90-degree bend plus ______ extension at free end of bar, where db = bar diameter
Question 64 of 70
64. When splicing 1/2-inch-thick rebar of reinforcing steel without the benefit of drawing specifications, what is the minimum distance, in inches, that you should lap the bar?
Question 65 of 70
65. The minimum clear spacing between parallel bars in a layer shall be db, but not less than ___________. (db = nominal diameter of the bar).
Question 66 of 70
66. What tie is most often used in floor slabs?
Question 67 of 70
67. The grade designation of a reinforcing steel bar.
Question 68 of 70
68. Which one should not consist in bundling reinforcing bars of bigger quantities.
Question 69 of 70
69. The sample of reinforcing steel bars for every 10,000 kgs shall be
Question 70 of 70
70. Bundles and lifts should be securely tied with a minimum No. ____ gage wire for large bundles and/or lifts.