Question 447Motor Plants - Assistant Engineer

The correct answer is D) the seal ring on the operating slide is defective. The seal ring on the operating slide is responsible for maintaining the proper pressure within the centrifuge bowl during operation. If this seal ring is defective, it can cause a loss of pressure, preventing the bowl from opening properly for sludge ejection. This is the most likely cause of the issue described in the question. The other answer choices are incorrect because they do not directly address the issue with the seal ring. Clogged sludge ports (A) or a clogged bowl disk set (C) would not necessarily prevent the bowl from opening, and high operating water pressure (B) is not the primary cause of the problem described.