Question

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

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

Answer 1

The correct option is D

A B C
2 3 4
By sheep foot roller the compaction is achieved by a combination of tamping and kneading. It is suitable for cohesive soils.
Frog hammers are pneumatic rammers. They are used for cohesionless soils, especially in small restricted and confined areas such as beds of drainage trenches and backfills of bridge abutments.
Vibratory rollers or drum have a separate motor drive i.e., an arrangement of eccentric weights so as to produce high frequency, low amplitude vertical oscillation. Layers of the order of 1 m deep could be compacted to high densities.
Vibrofloat can be used for compacting cohesionless soils up to 12 m depth (i.e., relatively larger depths.)