Question 1401 Deck General

70% to pass

In controlling pollution, which action should be taken after all dirty ballast has been transferred to the slop tank and prior to discharge through the oily water separator?

A The dirty ballast tank is crude oil washed.
B The clean tanks should be ballasted.
C The slops should be allowed time to settle.
D Chemicals should be added to emulsify the oil.
AI Explanation

The correct answer is C) The slops should be allowed time to settle. After all dirty ballast has been transferred to the slop tank, the slops should be allowed time to settle in order to separate the oil from the water before discharging through the oily water separator. This allows the oil to rise to the top of the tank, making it easier to remove the oil and water separately. The other answer choices are incorrect because: A) Crude oil washing the dirty ballast tank is not necessary at this stage, B) Ballasting the clean tanks is not the appropriate next step, and D) Adding chemicals to emulsify the oil would make it more difficult to separate the oil and water.

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