About half an hour before the engine is required, cooling wa

【名词&注释】

阴极保护(cathodic protection)、水压试验(hydrostatic test)、防腐剂、密封性(sealing)、电化学腐蚀(electrochemical corrosion)、保护膜(protective film)

[单选题]About half an hour before the engine is required, cooling water at （） must be circulated.

A. more than the working temperature
B. less than the working temperature
C. the working temperature
D. the same as the surrounding temperature

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学习资料：

[单选题]废气锅炉出口排烟温度t2不应低于露点，为了最大限度利用排气余热，在标定工况下，t2=露点+△t（℃），式中△t不应小于（）℃.

A. 25
B. 30
C. 40
D. 50

[单选题]采用尺寸选配法修理柱塞偶件或针阀偶件时，下列正确说法是（）。

A. A．只加工一个重要的零件恢复其形状
B. B．配制另一个零件
C. C．两个零件分别加工消除其几何形状误差
D. D．修复率＞50%

[单选题]为了防止涡轮壳体电化学腐蚀^{(electrochemical corrosion)}，除用淡水冷却外，可以采用（）等方法。Ⅰ.壳体表面覆盖保护膜^{(protective film)}；Ⅱ.阴极保护；Ⅲ.阳极保护；Ⅳ.淡水中加防腐剂；Ⅴ.安装防腐锌块。

A. Ⅱ＋Ⅳ
B. Ⅰ＋Ⅱ＋Ⅳ＋Ⅴ
C. Ⅰ＋Ⅳ＋Ⅴ
D. Ⅰ＋Ⅱ＋Ⅴ

[单选题]检查油润滑艉轴承密封装置防蚀衬套的密封性采用（）方法。

A. 油压试验
B. 水压试验
C. 磨合试验
D. 运转试验

[单选题]In a （） engine the charge of air in the cylinder before compression commences is above atmospheric pressure.

A. pressure charged
B. naturally aspirated
C. contaminated
D. high speed diesel

[单选题]Lubricating oil systems for diesel engine journal bearings are usually lubricated by which of the following types of lubricating oil systems?（）

A. Splash
B. Gravity
C. Pressure
D. Bypa

[单选题]Routine monitoring of a diesel engine should include （）.

A. checking for leaks
B. checking temperatures and pressures
C. listening for abnormal noises
D. all of the above

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