2713Civil EngineeringMedium
The correct sequence of drilling equipment for increasing size of holes in tunnels is________?
Awagon drill, churn drill, shot drill
Bshot drill, churn drill, wagon drill
Cwagon drill, shot drill, churn drill
Dchurn drill, wagon drill, shot drill
Correct answer
A. wagon drill, churn drill, shot drill
Explanation
The correct answer is wagon drill, churn drill, shot drill.