Question

Match the following: $$ \begin{array}{ll|l} \text{Instrument} & & \text{Measurement} \\ \hline P & \text{Flat jack} & 1.\ \text{In-situ stress in rock} \\ Q & \text{Borehole deformation gauge} & 2.\ \text{Load} \\ R & \text{Tape extensometer} & 3.\ \text{Bed separation resistance} \\ S & \text{Bore hole penetrometer} & 4.\ \text{Roof convergence} \\ \end{array} $$

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

Hint:

Match mining instruments to their rock deformation and stress measurements.

Answer 1

The Correct Option is A

- Flat jack measures load (P-2) - Borehole deformation gauge measures in-situ stress in rock (Q-1) - Tape extensometer measures roof convergence (R-4) - Borehole penetrometer measures bed separation resistance (S-3)