Materials Engineer Test Reviewer
1. Scales for weighing aggregates and cement shall be accurate within ____ % throughout the range of use. Scales shall be inspected and sealed as often as the Engineer may deem necessary to assure their continued accuracy.
a) 1.0 %
c) 0.5 %
b) 1.5 % d) 2.0 %
2. When cement is placed in contact with the aggregate, batches may be rejected unless mixed within _____ hours of such contact.
a) 1.5 hours
c) 0.5 hours
b) 2.0 hours d) 2.5 hours
3. When mixed at the site or in a central mixing plant, the mixing time shall not be less than ______ nor more than ____ unless mixer performance test prove adequate mixing of concrete in a shorter time period.
a) 30 seconds nor more than 90 seconds
b) 50 seconds nor more than 90 seconds
c) 60 seconds nor more than 120 seconds
d) 90 seconds nor more than 120 seconds
4. 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.
a) 45 seconds
c) 15 seconds
b) 30 seconds d) 20 seconds
5. Concrete not place within ____ minutes from the time the ingredients were charged into the mixing drum shall be used.
a) 120 minutes
c) 60 minutes
b) 150 minutes
d) 90 minutes
6. When concrete is delivered in truck mixers, additional water may beaded to the batch and additional mixing performed to increase the slump to meet the specified requirement if permitted by the Engineer, provided all these operation are performed within ____ after the initial mixing operation and the water and cement ratio is not exceeded.
a) 30 minutes
c) 45 minutes
b) 15 minutes
d) 60 minutes
7. A sample from a bituminous mix weighs 1000 grams. At extraction, it was found out that the dry aggregate weighed 950grams. What is the % of asphalt by weight of mix?
a) 5.2 %
b) 5.0 %
c) 5.4 %
d) 4.8%
8. The minimum penetration of the preservative with the surface of the timber piles shall be ____
a) 150 mm c) 250 mm
b) 200 mm
d) 100 mm
9. The contractor shall submit in writing a job-mix formula for the mixture supported by laboratory test data along with samples of resources of components and viscosity – temperature relationships to the Engineer for testing and approval at least ____.
a) two weeks c) one week
b) three weeks
d) four weeks
10. The concrete samples should be stored in a moist conditioned temperature within the range of ____ until the time of test.
a)18* C to 24* C
c) 14* C to 24* C
b) 15* C to 18* C d) 18* C to 28* C
11. This is used in soil stabilized road surface due to its high ____ property, that is, it absorbs and retains water.
a) Potassium Chloride c) Magnesium Chloride
b) Calcium Chloride
d) Sodium Chloride
12. The mass % wear of soil aggregate used in cement/lime proportions should not be more than ____.a) 40 % c) 45 %
b) 50 %
d) 55 %
13. The uniform rate at which the movable head of the CBR machine travels _____. a) 0.05 in/ min
c) 0.08 in /min
b) 0.10 in /min
d) 0.09 in /min
14. Cast in place concrete shall not be post – tensioned until at least ____ and until the compressive strength has reached the strength specified.
a) 7 days
c) 14 days
b) 10 days
d) 20 days
15. The penetration test is an indication of the ____ of asphalt.
a) Consistency
c) Hardness
b) Softness
d) Flash Point
16. Specification requires one (1) Quality test for every ____ of asphalt a) 20 tons
c) 50 tons
b) 200 tons
d) 40 tons
17. The ____ is the most commonly used method in the design and evaluation of bituminous concrete mixes.
a) Job mix formula
c) Marshall Stability
b) Design mix
d) Extraction
18. Vibration shall operate a frequency of 8,300 to 9,600 impulses per minute under load at a maximum spacing of ____ cm.
a) 30 cm
c) 60 cm
b) 50 cm
d) 40 cm
19. The specific gravity of Sodium Sulfate used in soundness test for aggregate should be within the range of ____.
a)1.151 to 1.174
c) 1.051 to 1.154
b) 1.250 to 1.178
d) 1.058 to 1.184
20. The specific gravity magnesium sulfate solution used in soundness test for aggregate should be within the range of ____ .
a) 1.280 to 1.408
c) 1.295 to 1.308
b) 1.180 to 1.308
d) 1.195 to 1.318
21. Aggregate accounts for 92 – 95 % of the weight of the bituminous mixture asphalt accounts for 5 – 8 % of the weight of the mix. The exact percentage to be used is determined by the _____
a) Trial mix
c) Job mix
b) Design mix
d) Job order
22._____ is an indication that the asphalt mix is overheated.
a) Blue smoke
c) Rising steam
b) Stiff appearance
d) Mix slumps in truck
23. In checking the temperature of the mix, the thermometer should be inserted into the mix at least ____.
a) 2 inches c) 4 inches
b) 6 inches
d) 6.0 mm
24. _____ is applied on existing bit, or cement concrete surface with bituminous materials.
a) Bituminous Prime Coat
c) Bituminous Seal Coat
b) Bituminous Tack Coat
d) Bituminous Surface Treatment
25. The solution used in the soundness test of aggregate shall be cooled to a temperature of 21 +or – 1* C and maintain at that temperature for at least _____.
a) 24 hours
c) 48 hours
b) 36 hours
d)18 hours
26. Proper compaction of the fill materials is very important, as it will ______.
a) Increase the shear strength
b) Decrease permeability
c) Minimize compressibility
d) All of the above
27. In which DPWH item is emulsified asphalt not suitable?
a) Item 301
c) Item 304
b) Item302
d) Item 308
28. Unconfined compressive strength test is usually performed on______.
a) Sandy soils
c) Organic soils
b) Silty soils d) Clayey soils
29. Consolidation test is usually performed on ____ samples
a) Disturbed c) Consolidated
b) Undisturbed d) Both a & b
30. A concrete core sample having a maximum height of less than_____ of its diameter before capping or height less than its diameter after capping shall not be tested.
a) 93 %
c) 95 %
b) 94 %
d) 96 %
31. The cohesion and internal friction of soil is tested by
a) Tri axial shear test c) Bearing test
b) Direct shear test
d) All of the above
32. In concrete acceptance, core will be considered adequate if the average strength of the cores is equal to what?
a) 80% of specified strength & if no single core is less than 75% of specified strength b) 90% of specified strength & if no single core is less than 80% of specified strength
c) 85% of specified strength& if no single core is less than 75% of specified strength
33. Before the cement is to be used, sampling must be done at least _____ before use.
a) one week
c) two weeks
b) 14 days
d) 12 days
34. Asphalt cement shall not be used while it is foaming nor shall be heated at ____ at any time after delivery.
a) 107*
c) 120*
b) 159*
35. Moisture content of aggregate in bit mix shall not exceed ____ of the time it is introduce into the mixing unit.
a) 1.5 mass %
c) 1 mass %
b) 2.0 mass %
36. Batching tolerance for Sand and Aggregate is ____.
a) 1 %
c) 3 %
b) 2 %
37. Betweenstages of curing, concrete shall not be exposed for more than how many hours?
a) 24 hours
c) ½ hour
b) 3 hours d) 72 hours
38. As a Materials Engineer, what will you do with major honeycombed area that is considered as defective work?
a) Plaster
b) Payment of the concrete will be made an adjustment
c) Removed and replaced at the expensed of the contractor
39.If the strength of control specimen does not meet the requirement and not feasible to obtain cores due to structural consideration, as a Materials Engineer what will be your decision?
a) Removed and replaced
b) Area will not be paid
c) Payment will be made at an adjusted price
40. After concrete has been placed, it is advisable to maintain fully welted and in position for how many hours?
a) 14 hours
c) 72 hours
b) 24 hours
d) 15 – 18 hours
41. Rock shall be excavated to a depth ____ below sub grade within the limit of the roadbed a) 100mm c) 200 mm
b) 150 mm
42. Minimum penetration of all piles shall be ____.
a) 3 meter
c) 7 meter
b) 6 meter
d) 4.5 meter
43. Piles shall not be driven within 7 meters of concrete less than _____ old.
a) 7 days
c) 28 days
b) 14 day
44. Paint contains _____ of pigment and _____ vehicle.
a) 20 % & 80 % c) 79 % & 21 %
b) 21 % & 79 %
d) 80 % & 20 %
45. Minimum thickness of bedding materials beneath the pipe is _____.
a) 100 mm
c) 200 mm
b) 150 mm
46. Tolerance of gabion dimension is _________________.
a) +/- 1%
c) +/- 3 %
b) +/- 2 %
d) +/- 4 %
47. Minimum size of galvanized wire mesh is ____________.
a) 2.0 mm
c) 2.7 mm
b) 2.2 mm
d) 3.4 mm
48. Minimum density of gabions is ___________.
a) 1,000 kg/cu. m
c)1,400 kg/cu. m
b) 1,200 kg/cu. M d) 1,500 kg/cu. m
49. Soundness loss of field gabions is __________________.
a) 9 % after 5 cycles
c) 11 % after 5 cycles
b) 10 % after 5 cycles
d) 12 % after 5 cycles
50. The heating temperature of reflector zed thermoplastic material during application is _____
a) 130 +/- 7* C
c) 200 +/- 7* C
b) 150 +/- 7* C
d) 211 +/- 7* C
51. Submission of sample minimum quantity of material for asphalt cement is -------.
a) 5 kg c) 20 kg
b) 10 kg d) 100 kg
52. For how many years does the small Contractor given to procure necessary testing equipment?
a) 2 years
c) 5 years
b) 4 years
d) 6 years
53. The depth of the weakened joints must not be less than ____ and a width of ___.
a) 40 mm & 6 mm
c) 40 mm & 5 mm
b) 50 mm & 5 mm
d)50 mm & 6 mm
54. Used of bituminous cold mix for potholes patching during rainy/wet period is acceptable
a) False
b) True