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Which of the following excavator is most suitable for digging under water ?
1. Drag line
2. Hoe
3. Clamshell
4. Dipper shovel 

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Correct Answer - Option 1 : Drag line

Concept:

Drag line:

The basic character of this machine is dragging the bucket against the material to be dug, it is called as drag line. A drag line has distinct advantages compared with a power shovel because of its long light boom. It is used for the construction of ports, for excavations underwater, sediment removal in water bodies, etc.

Advantages:

  • A drag line usually does not have to go into a pit or hole for excavating the earth. It may operate on natural firm ground. Therefore it is more useful when the earth is removed from a ditch, canal or pit containing water.
  • When the excavated earth is to be deposited on nearby banks or dams, it is better to use drag line with a long boom enough to dispose of the earth in one operation, eliminating the need of hauling units thereby reducing the cost of handling the earth.
  • A drag line is excellent for excavating trenches without shoring.

Comparison between all different types of excavating equipment:

Item of Comparison

Power Shovel

Back Hoe

Drag line

Clam Shell

Excavation in hard soil or rock

Good

Good

Not Good

Poor

Excavation in wet soil or mud

Poor

Poor

Moderately good

Moderately good

Distance between footing and digging

Small

Small

Long

Long

Loading Efficiency

Very Good

Good

Moderately good

Precise but slow

Cycle time

Short

Sightly more than power shovel

More than power shovel

More than the other equipment

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