Question 690Steam Plants - Assistant Engineer

The correct answer is C) Sediment on the bottom, water in the middle, and oil on top. This is the correct answer because when a mixture of contaminated lube oil, water, and sediment is allowed to settle undisturbed, the different components will separate based on their relative densities. The sediment, being the heaviest, will settle to the bottom of the tank. The water, being denser than the oil, will form the middle layer. And the oil, being the least dense, will float to the top of the tank. The other options are incorrect because they do not accurately reflect the order of separation based on the relative densities of the components.