Materials Engineer Quiz
To enhance my materials engineer ability
- 1.The minimum penetration of the preservative with the surface timber piles shall be?
- A.
150 mm
- B.
200mm
- C.
250mm
- D.
100mm
- 2.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%
- B.
1.5%
- C.
0.5%
- D.
2%
- 3.When cement is placed in contact with the aggregate , batches may rejected unless mixed with __ hours of such contact.
- A.
1.5
- B.
2
- C.
.5
- D.
2.5
- 4.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 short period of time.
- 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
- 5.The flow of water shall be uniform and all water should be in drum by the end of the first__ seconds of the mixing period.
- A.
45
- B.
30
- C.
15
- D.
20
- 6.Concrete not place within __minutes from the time the ingredients were charged into the mixing drum shall be used.
- A.
120
- B.
150
- C.
60
- D.
90
- 7.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 viscous temperature relationships to the engineer for testing and approval at least.
- A.
2 weeks
- B.
3 weeks
- C.
1 week
- D.
4 weeks
- 8.The concrete sample should be stored in a moist condition temperature within the range of __until the time of tests
- A.
18* c -24*c
- B.
15* c -18*c
- C.
14* c -24*c
- D.
16* c -24*c
- 9.This is used in soil stabilized road surface due to its high __ property, that is, it absorb the retain water
- A.
Potassium chloride
- B.
Magnessium chloride
- C.
Sodium chloride
- D.
Calcium chloride
- 10.the mass of wear of soil aggregates used in cement / lime proportions should not be more than__
- A.
40
- B.
50
- C.
60
- D.
45
- 11.The uniform rate at which the movable head of the cbr machine travel is__
- A.
.06 in/min
- B.
.01 in/min
- C.
.1in/min
- D.
.08 in/min
- 12.Cast in place concrete shall not be post tentioned until at least ___ and until the compressive strength has reached the strength specified
- A.
7days
- B.
10
- C.
15
- D.
28
- 13.The penetration test is an indication of the __of asphalt
- A.
Consistency
- B.
Softness
- C.
Hardness
- D.
Flash point
- 14.The __ is the most commonly used method in the design and evaluation of bituminous concrete mixes
- A.
Job mix formula
- B.
Marshall stability
- C.
Extraction
- D.
Design mix
- 15.Vibration shall operate a frequency of 8300 to 9600 impulses per minute under load at a maximum spacing of __cm
- A.
30
- B.
40
- C.
50
- D.
60
- 16.The sp, gravity of sodium sulfate used in soundness test for aggregate should be in range of
- A.
1.051-1.154
- B.
1.058/-1.184
- C.
1 1.151-1.174
- D.
1.25-14.178
- 17.Aggregate accounts for 92-95% of the weight of the bituminous mixture asphalt accounts 5-8% of the weight of the mix. the exact % to be used is determined by the__
- A.
Design mix
- B.
Trial mix
- C.
Job mix
- D.
Job mixture
- 18.The sp. gravity of magnesium sulfate used in the soundness test
- A.
1.28-1.408
- B.
1.18-1.308
- C.
1.295-1.308
- D.
1.195-1.308
- 19.In checking the temp of the mix , the thermometer should be inserted into the mix at least__inches
- A.
2
- B.
4
- C.
6
- D.
8
- 20.__ is applied on existing bit, or cement concrete surface with bitum matls
- A.
Bituminous tack coat
- B.
Bituminous sealcoat
- C.
Bituminous prime coat
- D.
Bituminous surface coat
- 21.The solution used in the soundness test of aggregate shall be cooled at a temp of 21 +_1*C and maintain that temp for at least__hours
- A.
24
- B.
48
- C.
18
- D.
21
- 22.Proper compaction of the fill matls is very important, as it will
- A.
Increase the shear strength
- B.
Decrease permiability
- C.
Minimize compressibility
- D.
All of the above
- 23.In concrete acceptance , core will be considered adequate if the average strength of the cores is = to what?
- A.
80% of specified strength and if no single core is less than 75% of specified strength
- B.
90% of specified strength and if no single core is less than 80% of specified strength
- C.
85% of specified strength and if no single core is less than 75% of specified strength
- D.
90% of specified strength and if no single core is less than 75% of specified strength
- 24.The cohesion and internal friction of soil shall be tested by
- A.
Tri axial test
- B.
Direct shear test
- C.
Bearing test
- D.
All
- 25.Before the cement is to be used , sampling must be done at least __-before use
- A.
1 wk
- B.
14 days
- C.
2 wk
- D.
21 days
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