四、不凝結氣體對於冷凍系統有何影響，應如何予以排除？（20分）

一、請敘述往復泵的應用場合與特性，其排出量具有脈動的現象，係何原因所造成？應如何改善？（20分）

二、鍋爐的爐水吹放中，有關「表面吹放（Surface blow） 」與「底部吹放（Bottom blow）」的主要目的為何？又於操作時其個別所應注意的事項為何？請詳述之。（20分）

三、船舶壓縮空氣管路系統於設計上有那些要求？請敘述之。（20分）

五、請將下列英文譯成中文：（20分）An economizer is a simple heat exchanger that consists of a bank of tubes. These tubes are connected with an inlet and outlet header located in a relatively cool gas temperature zone beyond the main generating bank of boiler. The additional heat is supplied to the feedwater from the economizer by cooling the flue gas. If oxygen is contained in the feedwater to the economizer, the oxygen is released when the external heat is applied. This may result in the tube and header corrosion. The air heaters cool the hot flue gases by the incoming combustion air instead of the feedwater in economizer.

五、請將下列英文翻譯成中文。 （20 分）The Port State Control Officer (PSCO) ensures compliance with Annex I of MARPOL 73/78 by assessing oil residues, sludge and bilge water holding tanks, and the efficiency of the oily water separator. The PSCO reviews the Oil Record Book to verify proper disposal and usage of reception facilities, noting any inadequacies. Ships must maintain improved sludge systems to store and dispose of oil residues in line with international standards. The PSCO checks the effectiveness of onboard oil filtering systems and related equipment for compliance. The inspection now includes automated monitoring systems to track oil discharges and sludge processing in real time. By enforcing these regulations, authorities aim to protect marine ecosystems and promote sustainable maritime operations.

四、以主機缸套冷卻水作為加熱海水淡化裝置的工作流體，請詳述在啟動和停用時，主機工作系統應特別注意那些問題？（20 分）

三、請詳述造成空氣壓縮機（Air Compressor）的出口排氣溫度過高的原因為 何？（20 分）

二、船用泵（Pump）是屬於流體機械（Fluid Machinery）的一種，其中離心泵 （Centrifugal Pump）廣泛使用於輪船機艙中，請以流量（Flow Rate）與揚程（Head）試述離心泵的結構種類和適用的工作場域。（20 分）

一、伯努利方程式（Bernoulli’s Equation, BE）與雷諾數（Reynolds Number, Re） 為兩個應用流體力學的重要內容，請分別詳述 Re 所代表的物理意義和 BE 的基本原理並分析討論其流體流動時兩者之間的關聯性。 （20 分）

五、請將下列專業英文翻譯成中文。（20 分）Controllable pitch propellers are normally fitted to a flanged tail shaft as the operating mechanism is housed in the propeller boss. As its name implies, it is possible to alter the pitch of this type of propeller to change ship speed or to adjust to the prevailing resistance conditions. This change in pitch is effected by rotating the blades about their vertical axes, either by hydraulic or mechanical means. A shaft generator can be driven at constant speed while allowing at the same time a change of ship’s speed through the propeller. Since it is normally possible to reverse the pitch completely, this type of propeller is used with a unidirectional engine to give full ahead or astern thrust, when maneuvering.

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