申論 1傳統式蒸氣產生系統之節熱器排煙出口溫度愈低，則其廢熱回收率愈高，但排煙之排出溫度亦不得過低，請詳述其原因。（20 分）
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申論 2請詳述四種液壓換向閥之控制裝置的工作原理與優缺點。（20 分）
申論 3請詳述何謂起動引注（Priming）？請列出兩種自動引注（Self-priming）方式並說明其工作原理。（20 分）
申論 4有一液壓馬達，其轉矩效率及容積效率分別為80%及90%，且馬達每轉之流體量為50 cm3/rev，轉速為1500 rpm。若本馬達欲得到12 kg-m 之轉矩，則所需之流體流量（以cm/min 表示之）及壓力（以kg/cm表示之）各為多少？請計算之。（20 分）
申論 5請將下列英文譯成中文。（20 分）On the compression stroke for a theoretical single cylinder compressor, the pressure risesto slightly above discharge pressure. A spring-loaded non-return discharge valve opensand the compressed air passes through at approximately constant pressure. At the end ofthe stroke the differential pressure across the valve, aided by the valve spring, closes thedischarge valve, trapping a small amount of high pressure air in the clearance spacebetween the piston and the cylinder head. On the suction stroke the air in the clearancespace expands, its pressure dropping until such time as a spring-loaded suction valvere-seats and another compression stroke begins.