FE exam 2023 with complete solutions

Which of the following statements regarding the phase diagram of soils is NOT correct? A. It shows three parts: solids at the bottom, water above it, and the air on the top. B. The three parts in the diagram depict the conditions at the bottom of the water channel where the soil is at the bed, water above it, and then the atmospheric air at the top. C. It shows the wright-volume relationship of a soil mass. D. The weight of air is taken as zero. correct answersB. The three parts in the diagram depict the conditions at the bottom of the water channel where the soil is at the bed, water above it, and then the atmospheric air at the top. Which of the following statements regarding the permeability through a soil is NOT correct? A. The coefficient of permeability can be measured using the constant head test method. B. The coefficient of permeability can be measured using the falling head test method. C. The coefficient of permeability is a measure of hydraulic conductivity. D. The coefficient of permeability is dimensionless. correct answersD. The coefficient of permeability is dimensionless. Which of the following statements regarding permeability through soil is NOT correct? A. The coefficient of permeability has the same units as velocity. B. The velocity head plays a significant role and cannot be ignored in determining permeability. C. Head loss occurs because water molecules, whole traveling from upstream to downstream, expend energy in overcoming the frictional resistance provided by the soil. D. The hydraulic gradient is defined as the head loss per unit length. correct answersB. The velocity head plays a significant role and cannot be ignored in determining permeability. The dam's head drop from upstream to downstream is "H". The dam has a key, and it rests on a permeable layer of soil with an impermeable layer underneath it. Which statement regarding the key is NOT correct? A. The key increases resistance to weir sliding. B. The key increases resistance to weir overturning.