In __________ type of drill, the grinding of rock into small particles is carried out through the Abrasive effect of a b…

____________________ are ideal for drilling large diameter and deep holes in wood or thick man-made boards.

Effective compaction is not achieved by ________ rollers.

A ___________ Dredger essentially consist of sand pump which excavates and transport the bed material in one operation.

Twist bits are also available coated with __________

________________ conveyors maybe in the form of side discharge conveyors.

_________________ is a self-propelled drill.

A ____________ can be used on wet ground and in all conditions of weather.