Question 235General Subjects - Assistant Engineer

The correct answer is A) The density of oil is less than that of water and as a result the oil droplets in an oily-water mixture will tend to rise. This is the correct answer because the basic operating principle of an oily-water separator is based on the fact that oil has a lower density than water. As a result, when an oily-water mixture passes through the separator, the oil droplets will rise to the surface due to buoyancy, while the water sinks to the bottom, allowing for the separation of the two substances. The other answer choices are incorrect because they do not accurately describe the relationship between the density of oil and water, and how this affects the movement of oil droplets in an oily-water mixture.