Question 709Steam Plants - Assistant Engineer

The correct answer is A) increased condensate aeration due to the inability of the air ejectors to remove excessive air accumulation from the condenser. Explanation: 1. Confirmation of correct answer: A is the correct answer. 2. Explanation of reasoning: In an area with extremely cold sea water, the main circulating pump providing full cooling water flow to the condenser will result in increased condensation, which can lead to increased air accumulation in the condenser. This excessive air buildup can overwhelm the air ejectors, causing increased condensate aeration and reducing the effectiveness of the condenser. 3. Explanation of incorrect answers: Options B, C, and D are incorrect because they do not accurately describe the effects of operating a steam turbine propulsion unit in these conditions. The increased air accumulation would not improve the air ejectors' effectiveness, increase plant efficiency, or result in higher attainable vacuum.