Geotechnical Engineering - Soil Sampling

To obtain undisturbed clay soil sample, an Area Ratio of 10 % needs to be achieved for a thin walled sampling tube. If the outer diameter of the tube is 50.8 mm, the inner diameter (in mm) is ________ (rounded off to one...

The internal ($d_i$) and external ($d_o$) diameters of a Shelby sampler are 48 mm and 52 mm, respectively. The area ratio ($A_r$) of the sampler (in %, round off to two decimal places) is