海船船员考试题库2022船舶动力装置题库易混易错每日一练(09月13日)

1. [单选题]影响船舶动力装置可靠性的设计因素有（）。

A. 维修制度
B. 部件的连接方式
C. 原材料
D. 使用环境

2. [单选题]喘振是（）流通部分出现气流与叶片强烈撞击和脱流的结果。

A. 压气机
B. 涡轮机^(turbine)
C. 增压器
D. 涡轮壳体

3. [单选题]船轴腐蚀主要发生在（）。

A. 推力轴
B. 中间轴
C. 艉轴
D. 曲轴

4. [单选题]In an engine with air inlet valve and exhaust valve on its cylinder heads the fresh air will enter into the cylinder （） and the gases exhaust （）, there being an adequate overlap between the inlet opening and the exhaust closing.

A. downwards；upwards
B. upwards；downwards
C. downwards；downwards
D. upwards；upward

5. [单选题]Valve overlap is the period during which （）.

A. the inlet valve is open
B. the exhaust valve is open
C. both valves are closed
D. both valves are ope

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