Question

During a sampling operation, the drive sampler is advanced 600 mm and the length of the sample recovered is 525 mm. What is the recovery ratio of the sample?

• A. 0.125
• B. 0.140
• C. 0.875
• D. 0.143

Hint:

- The recovery ratio is an essential parameter to evaluate the efficiency of a sampling process. - A recovery ratio close to 1 indicates minimal sample disturbance.

Answer 1

The Correct Option is C

Step 1: Use the formula for recovery ratio: \[ R = \frac{L_s}{L_d} \] where, \( L_s = 525 \) mm (length of recovered sample), \( L_d = 600 \) mm (depth of penetration). Step 2: Compute the recovery ratio: \[ R = \frac{525}{600} \] Step 3: Calculation: \[ R = 0.875 \] Thus, the correct answer is (C) 0.875.