Geotechnical Engineering

Field Compaction Test

Question 1
Marks : +2 | -2
Pass Ratio : 11%
Pneumatic tyred rollers are best suited for ____________
Cohesion-less sand
Cohesive soils
Cohesion-less gravels
All of the mentioned
Explanation:
Due to the combined action of pressure and kneading makes pneumatic rollers best suitable for cohesion-less sand and gravels and, and on cohesive soils.
Question 2
Marks : +2 | -2
Pass Ratio : 11%
Which of the following rollers have wheels, mounted at slight angle with respect to axle?
Sheep foot roller
Smooth wheel roller
Wobble wheel roller
Tandem roller
Explanation:
To provide a kneading action, the wobble wheel rollers have wheels mounted at a slight angle with respect to the axle.
Question 3
Marks : +2 | -2
Pass Ratio : 11%
Jumping rammers that are used for compacting the soil is also known as ____________
Frog rammers
Combustion rammers
Pneumatic rammers
None of the mentioned
Explanation:
Internal combustion type jumping rammers are also known as frog rammers. They weigh up to 10 tons.
Question 4
Marks : +2 | -2
Pass Ratio : 22%
Sheep-foot-rollers is most suitable for compacting ____________
Fine-grained soil
Cohesive soil
Cohesion-less soil
Clay soil
Explanation:
Sheet-foot-rollers are recommended for compacting cohesive soils, but are not considered effective on coarse grained cohesion-less soil.
Question 5
Marks : +2 | -2
Pass Ratio : 11%
The rolling equipment’s are of __________ types.
5
4
2
3
Explanation:
The rolling equipment’s are of five types:
Question 6
Marks : +2 | -2
Pass Ratio : 11%
The number of layers of soil compaction depends on ___________
Type of soil and Amount of compaction required
Water content of soil
None of the mentioned
All of the mentioned
Explanation:
The number of soil layers and number of tamps per layers depends upon the type of soil and the amount of compaction required.
Question 7
Marks : +2 | -2
Pass Ratio : 11%
The performance of a compaction equipment depends on _____________
Soil type
Water type
Particle size distribution
All of the mentioned
Explanation:
The performance of compaction equipment depends on the soil type, its particle distribution and its water content.
Question 8
Marks : +2 | -2
Pass Ratio : 11%
Which of the following type of vibrating unit used in a vibrator?
Out-of balance weight type and Pulsating hydraulic type
Piston hydraulic type
None of the mentioned
All of the mentioned
Explanation:
The vibrators consist of vibrating unit of either the out-balance weight type or a pulsating hydraulic type mounted on a screed, plate or roller.
Question 9
Marks : +2 | -2
Pass Ratio : 11%
The tyre pressures in the smaller rollers are in the order of ____________
250 kN/m2
400 kN/m2
500 kN/m2
100 kN/m2
Explanation:
Smaller rollers are having a tyre load of about 7.5kN and pressure in the order of 250 kN/m2.
Question 10
Marks : +2 | -2
Pass Ratio : 11%
The foot pressure in sheep foot rollers ranges from _____________
800-350 kN/m2
800-3500 kN/m2
300-1500 kN/m2
350 kN/m2
Explanation:
For sheep foot rollers, the foot pressure ranges from 800 to 3500 kN/m2.