40. 柴油機運轉中當發現膨脹水櫃上下波動，及缸套冷卻水壓力也不穩定，可能的原因為何？
(A) 壓力表故障
(B) 汽缸蓋或缸套有穿透性裂紋
(C) 外面風浪大，主機負荷大
(D) 引擎過負荷運轉

36. 鍋爐使用PID控制系統，其英文字母「P」為何種控制器？ (A) 比例 (B) 積分 (C) 微分 (D) 數位

37. 冷凍系統若蒸發溫度低於0℃，且熱力膨脹閥的開度恰當時，則下列敘述何者錯誤？ (A) 蒸發器外表面均勻結白霜 (B) 壓縮機的吸氣管外表面有凝露 (C) 壓縮機的吸氣管有黏手感且均勻結薄霜（未裝回熱器） (D) 壓縮機的吸氣管應有冰冷感而不結霜（裝有回熱器）

38. 下列那一種工具機，是用於磨削工具、毛邊、刀具、胚料和測試材料的性質？ (A) 鋸床 (B) 砂輪機 (C) 俥床 (D) 圓鋸機

39. 船舶軸系安裝時，軸線輕微不正的處理方式為下列何者？ (A) 通過調節中間軸承位置加以改正 (B) 改變主機安裝位置 (C) 修正螺旋槳中心線 (D) 改變推力軸承位置

1. 下圖所示之國際信號旗為何？ (A) A (B) C (C) G (D) L

2. A: Ocean Uni. This is helicopter. Identify yourself by directing signal lamp at me. Over. B: Helicopter. This is Ocean Uni. I am now making identification signal. Over. Question: What is Ocean Uni requested to do? (A) To identify herself. (B) To identify the helicopter. (C) To prepare the landing of the helicopter. (D) To prepare lighting for the helicopter.

3. Please ___________ the lifeboat on the water and get ready for abandoning the vessel. (A) launch (B) retrieve (C) salvage (D) redeem

4. You are the officer of the watch (OOW) in poor visibility and plot another vessel on the radar approaching your ship from your port bow so as to involve a close quarter situation. Which of the followings is your most suitable action to avoid the risk of collision? (A) Make an early and substantial alteration of course to starboard. (B) Make an early and substantial alteration of course to port. (C) Make a small increase of speed to pass ahead of the other vessel. (D) Make a small reduction of speed to allow the other vessel to pass ahead of you.

5. What is the meaning of “prolonged blast”? (A) A blast of about one second’s duration. (B) A blast of from two to three second’s duration. (C) A blast of from four to six second’s duration. (D) A blast of from eight to ten second’s duration.

6. 一組信號旗的頂端只在旗桿高度一半的地方，其術語為何？ (A) On the top (B) At the dip (C) At the top (D) On the dip