GATE CE 2026 Set 1 — Question 32
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Geotechnical Engineering → Subsurface Investigation → Soil Sampling
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Question
To obtain undisturbed clay soil sample, an Area Ratio of needs to be achieved for a thin walled sampling tube. If the outer diameter of the tube is mm, the inner diameter (in mm) is __________________ (rounded off to one decimal place).
Correct answer
48.2 to 48.6
Solution
The Area Ratio () of a soil sampler is defined as:where is the outer diameter and is the inner diameter.Given:
mmSubstituting the values:Rounding off to one decimal place, we get mm.
mmSubstituting the values:Rounding off to one decimal place, we get mm.
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