21. 冷凍系統中如有空氣混入，則會出現何種現象？(A) 冷凝器內之壓力與溫度會下降，冷凍效果降低(B) 冷凝器內之壓力與溫度會上升，冷凍效果提高(C) 冷凝器內之壓力與溫度會下降，壓縮機消耗功率下降
22. The engine logbook should normally be kept at a convenient place in _________.(A) Wheel House.(B
23. Which type of valve should be installed where an undesired reversal of flow is restricted on the
25. The shaft ________ provides considerable impacts of the whirling and tensional modes ofvibration
30. Which device is used to provide the relatively large quantities of low-pressure air.(A) fan(B) c
29. 輔鍋爐燃油噴射系統中，為改進「壓力式霧化器」的缺點，可選用「回油型霧化器」，對霧化室充分供油，使噴射壓力保持一定，超過噴射所需燃油，則流回燃油泵的吸入側。其可利用燃油系統上的何種裝置或方法來控
32. Which efficiency is the ratio of the brake mean effective pressure to the indicated meaneffectiv
33. 依據螺槳曲線，假設船舶柴油主機全出力時為8000 kW，主機轉速（N）為100 rpm，當主機機轉降為80 rpm時，則所對應之主機出力約為多少kW？(A) 4000(B) 5000(C) 6