Question

_________ is a rotary type of drill and its bit consists of a metal mould or Matrix containing a large number of diamonds.

(a) Percussion drilling

(b) Shot drill

(c) Diamond drill

(d) Churn drill

Answer 1

Right answer is (c) Diamond drill

The explanation: The Diamond drill is rotated and the diamonds disintegrate the rock. The rate of drilling with a diamond drill will depend on the type of rock and it varies from 300 mm to several metres per hour. Diamond drills are capable of drilling holes in excess of 300 meters.