Construction Equipment MCQ with answer and solution

Concept

Choice of excavator

Step-by-step solution

1. Dragline: digs below its own level, has a long reach and can work in water-logged ground. 2. Backhoe: digs below ground level but with a limited reach and depth. 3. Power shovel: digs above its own level. 4. The key marks the dragline as the machine best suited to deep excavation below water level.

Explanation

A dragline can work from firm ground and dig soft, wet soil far below its own level and at a long distance. It is therefore the machine preferred for deep excavation below the water level, such as river dredging and canal excavation.

Shortcut

Shovel → above ground. Backhoe → trenches. Dragline → large and deep, under water. Clamshell → deep vertical pits.

Common mistake

Choosing the clamshell.