This set of Geotechnical Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Compaction – Standard Proctor Test”.
1. The standard proctor test was developed by ___________
a) Darcy
b) Terzaghi
c) Proctor
d) Rendulic
View Answer
Explanation: The standard proctor test was developed by R.R.Proctor in 1933 for the construction of earth fill dams in the state of California.
2. The compaction process can be accomplished by ___________ process.
a) Rolling
b) Tampering
c) Vibration
d) All of the mentioned
View Answer
Explanation: Compaction can be done by rolling, tamping or vibration by a steel-tyred or rubber-tyred roller.
3. The compaction energy used for standard proctor test is ___________
a) 595 kJ/m3
b) 300 kJ/m3
c) 6065 kJ/m3
d) 1000 kJ/m3
View Answer
Explanation: The compaction energy used in the proctor test is 6065 kg cm per 1000 ml of soil which is equal to 595kJ/m3.
4. Which of the following test are used in the laboratory, for compaction?
a) Vibration test
b) Standard proctor test and Jodhpur-mini compactor test
c) None of the mentioned
d) All of the mentioned
View Answer
Explanation: Some of the compaction tests used in the laboratory is: standard and modified proctor test, Harvard Miniature compaction test, Abbot Compaction test and Jodhpur-mini compactor test.
5. A line showing the water content dry density relation for the compacted soil is ___________
a) Zero air voids lines
b) Air-voids line
c) Density line
d) All of the mentioned
View Answer
Explanation: Air-voids line is a line which shows the water content dry density relation for the compacted soil containing a constant percentage of air voids.
6. Which of the following equipment is not used in standard compactor test?
a) Cylindrical metal mould
b) Rammer
c) Circular face plate
d) Collar
View Answer
Explanation: The compactor test equipment consists of cylindrical metal mould, detachable base plate, collar, rammer of 2.5kg.
7. The initial percentage of water content taken for coarse-grained soil in proctor test is __________
a) 4
b) 10
c) 25
d) 50
View Answer
Explanation: The initial water content may be taken as 4 % for coarse-grained soils and 10 % for fine-grained soils as the quantity of water to be added for the first test depends on the probable optimum water content for the soil.
8. The water content corresponding to the maximum density in compaction curve is called ____________
a) Water content of compacted soil
b) Optimum water content
c) Air void water content
d) None of the mentioned
View Answer
Explanation: The water content goes on increasing till the maximum density is reached. The water content corresponding to the maximum density is called optimum water content W0.
9. The modified compactor test is also known as __________
a) Standard compactor test
b) AASHO test
c) Dietert test
d) Compaction test
View Answer
Explanation: The modified compactor test was standardized by the American Associates of State highway officials and is known as the modified AASHO test.
10. In standard compactor test, soil is compacted into _____________ layers.
a) 2
b) 4
c) 3
d) 5
View Answer
Explanation: The standard compactor test consists of compacting the soil at various water contents in the mould, in three equal layers, each layer being given 25 blows from the rammer.
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