中国船级社对修理后的船舶曲轴臂距差要求是（）mm（S为冲程，单

【名词&注释】

螺旋桨(propeller)、中国船级社(china classification society)

[单选题]中国船级社对修理后的船舶曲轴臂距差要求是（）mm（S为冲程，单位：mm）。

A. ＜0.125S
B. （0.125～0.25）S
C. ＞0.25S
D. ＞0.30S

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学习资料：

[单选题]吊缸检修完毕后，发现零件漏装时应（）。

A. 查找漏装部位重新进行安装
B. 保存起来，下次吊缸时再补装
C. 报废处理
D. 以上均可

[单选题]轴系校中计算中的热态是指（）。

A. 计及轴承温度的影响
B. 计及活塞运动部件的动态负荷变化的影响
C. 计及轴系振动的影响
D. 计及螺旋桨的附连水质量

[单选题]更换艉轴铜套的极限厚度为（）。

A. 0.02d＋5mm
B. 0.015d＋3.5mm
C. 0.03d＋7.5mm
D. 0.01d＋2mm

[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

[单选题]Which of the following will take place if the clearance of the main bearings are excessive?（）

A. bearing knocks
B. dropping of pressure of LO
C. noises
D. all the above

[单选题]Fins are installed on the generating tube surfaces in waste heat boilers to （）.

A. prevent soot fires in the exhaust system
B. prevent exhaust gas erosion of the tubes
C. increase the velocity of exhaust gas flow
D. increase the rate of heat transfer

[单选题]Generally speaking，the fuel injected into a marine diesel engine combustion chamber is ignited by（）.

A. spark plugs
B. glow plugs
C. heat of compression
D. a magneto

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