Question

The belt conveyor forming an essential part of a ladder dredger used for excavating river sand deposits is used for _______________________

(a) excavation of sand

(b) transporting excavated sand to the surface over small distances

(c) transporting excavated sand to the surface over large distances

(d) transporting excavated sand to the surface over all distances

This question was addressed to me during an online exam.

I need to ask this question from Navigable Waterways Requirements in portion River Navigation & Tank Irrigation of Irrigation Engineering

Answer 1

The correct choice is (b) transporting excavated sand to the surface over small distances

To elaborate: Ladder dredger has an endless chain of buckets for bringing the excavated material up to the surface and the cuttings carried by buckets are discharged on a belt conveyor. The material is then disposed of through a stacker conveyor at the rear of the dredger which is limited in length to about 100 m or so.