Factors affecting Compaction

Q. Sheep-foot rollers are recommended for compacting

1. granular soils
2. cohesive soil
3. hard rock
4. any type of soil

Q. In a compaction test if the compacting effort is increased, it will result in

1. increase in maximum dry density and OMC
2. increase in maximum dry density but OMC remains unchanged
3. increase in maximum dry density and decrease in OMC
4. no change in maximum dry density but decrease in OMC

Q. The unit weight of a soil at zero air voids depends on

1. specific gravity
2. water content
3. unit weight of water
4. all the above

Q. Match List - I with List - II and select the correct answer using the codes given below the lists:
Lists-I
A. Smooth wheel rollers
B. Sheep foot rollers
C. Pneumatic tyred rollers
D. Rammers

Lists-II
1. Most suitable for compacting cohesive soils
2. Most suited for compacting coarse grained soils
3. Used for compacting soils in confined places
4. Suitable for both cohesionless and cohesive soils.

1. 
   A B C D
   4 3 2 1
2. 
   A B C D
   2 1 4 3
3. 
   A B C D
   4 1 2 3
4. 
   A B C D
   2 3 4 1

Q. Consider the following statements:
1. In clay soils, the maximum dry unit weight tends to decrease as plasticity increases.
2. In clay soils, the maximum dry unit weight tends to increase as plasticity increases.
3. Heavy clays with high plasticity have the minimum dry unit weight and high OMC.
Which of these statements are correct?

1. 1, 2 and 3
2. 1 and 2 only
3. 2 and 3 only
4. 1 and 3 only

Q. In a compaction test, as the compaction effort is increased, the optimum moisture content

1. decreases
2. remains same
3. increases
4. increases first there after decreases

Q. Consider the following statements:
1. Relative density is a meaningful parameter for all types of soils.
2. Relative density is a meaningful parameter only for cohesionless soils.
3. Relative density is a better indicator of the denseness of an in-situ granular soil deposit than the void ratio.

Which of these statements are correct?

1. 1, 2 and3
2. 1 and 2 only
3. 2 and 3 only
4. 1 and 3 only

Q. Consider the following statements:
On addition of lime to a clay soil, generally
1. MDD and strength both increase
2. MDD decreases but strength increases
3. MDD and OMC both increase
Which of these statements is correct?

1. 1 only
2. 2 only
3. 3 only
4. None of these

Q. When the compaction energy increases the compaction of soils:

1. Both of OMC and maximum dry density decrease
2. Both of OMC and maximum dry density increase
3. OMC decreases but maximum dry density increases
4. OMC increases but maximum dry density decreases

Q. Consider the following statements:
1. Swelling is greater and shrinkage is less for clay compacted on the dry side of optimum.
2. Clays compacted on the dry side of optimum are characterized by larger strength.
3. An increase in organic content of clay soils causes an increase in optimum moisture content value.
Which of these statements are correct?

1. 1, 2 and 3
2. 1 and 2 only
3. 1 and 3 only
4. 2 and 3 only

Q. Match List-I (Type of soil) with List-II (Compaction equipment) and select the correct answer using the codes given below the lists:
List - I

A. Wet clays and silts
B. Crushed rock
C. Fill soils
D. Sands

List - II

1. Smooth wheel rollers
2. Vibrators
3. Pneumatic tyred rollers
4. Grid rollers

1. 
   A B C D
   4 2 3 1
2. 
   A B C D
   3 1 4 2
3. 
   A B C D
   4 1 3 2
4. 
   A B C D
   3 2 4 1

Q. An increase in compaction effort will lead to which of the following?

1. Decrease in both the optimum moisture content (OMC) and maximum dry density.
2. Decrease in the optimum moisture content (OMC) and increase in the maximum dry density.
3. Increase in the optimum moisture content (OMC) and decreases in the maximum dry density.
4. Increase in both the optimum moisture content (OMC) and maximum dry density.

Q. Match List-I (Equipment) with List-II (Purpose) and select the correct answer using the codes given below the lists:
List - I
A. Sheep foot roller
B. Frog hammer
C. Vibratory roller
List - II
1. To density cohesionless soils to relatively larger depths.
2. To compact lumpy cohesive soil fills
3. To compact soils at corners and places which bigger rollers cannot access.
4. To compact cohesionless soils of shallow depth

1. 
   A B C
   4 1 2
2. 
   A B C
   2 1 4
3. 
   A B C
   4 1 2
4. 
   A B C
   2 3 4

Q.

Explain the composition of the soil.