Question

Match correctly for method of drilling given in column A to principle of rock cutting in column B: $$ \begin{array}{ll|l} \text{Column A (Method of drilling)} & & \text{Column B (Principle of rock cutting)} \\ \hline P & \text{Diamond drilling} & 1.\ \text{Impact action} \\ Q & \text{Percussive drilling} & 2.\ \text{Thermal spalling} \\ R & \text{Rotary roller drilling} & 3.\ \text{Rotary abrasive} \\ S & \text{Jet piercing} & 4.\ \text{Cutting \& Ploughing} \\ \end{array} $$

• A. P-3, Q-4, R-2, S-1
• B. P-1, Q-4, R-2, S-3
• C. P-3, Q-2, R-1, S-4
• D. P-3, Q-1, R-4, S-2

Hint:

Match drilling methods to rock cutting principles: Diamond-abrasive, Percussive-impact, Rotary roller-ploughing, Jet-thermal.

Answer 1

The Correct Option is D

- Diamond drilling uses rotary abrasive action (P-3) - Percussive drilling uses impact action (Q-1) - Rotary roller drilling uses cutting and ploughing (R-4) - Jet piercing uses thermal spalling (S-2)