Question

A drill run of 3 m was carried out in a coalfield site, where rock core samples were recovered only for a cumulative length of 255 cm. The core loss in percentage is equal to ________. (Answer in integer.)

Hint:

Core loss (%) = \( \frac{\text{Run length – Recovered length}}{\text{Run length}} \times 100 \).

Answer 1

Correct Answer: 15

Step 1: Convert to common units.
Drill run = 3 m = 300 cm. Recovered core = 255 cm.
Step 2: Core loss.
\[ \text{Core loss} = 300 - 255 = 45 \, \text{cm.} \] Step 3: Percentage.
\[ \text{Core loss \%} = \frac{45}{300} \times 100 = 15\%. \] Step 4: Conclusion.
The core loss percentage = 15%.