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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
Correct answer is option 'C'. Can you explain this answer?
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Recovery ratio is defined as,
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Answer:

Recovery Ratio Calculation

- Recovery Ratio is the ratio of the length of the sample recovered to the length of the sampler advanced.
- Recovery Ratio = Length of Sample Recovered / Length of Sampler Advanced
- Given, the drive sampler is advanced 600 mm and the length of the sample recovered is 525 mm.
- Therefore, Recovery Ratio = 525 / 600
- Recovery Ratio = 0.875

Therefore, the recovery ratio of the sample is 0.875.

Explanation

During sampling operations, soil samples are collected using various types of samplers. The drive sampler is one of the most commonly used samplers in the field. The drive sampler is advanced into the soil using a driving mechanism, and the soil sample is collected in the sampler. The length of the sample recovered and the length of the sampler advanced are used to calculate the recovery ratio of the sample.

In this question, the drive sampler is advanced 600 mm, and the length of the sample recovered is 525 mm. Using these values, we can calculate the recovery ratio of the sample. The recovery ratio is calculated by dividing the length of the sample recovered by the length of the sampler advanced. The recovery ratio of the sample is 0.875.

A recovery ratio of 0.875 indicates that a significant portion of the soil sample was recovered during the sampling operation. The recovery ratio is an important parameter in the interpretation of soil test results. A low recovery ratio may indicate that the soil sample is not representative of the soil at the sampling location.
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