【名词&注释】
注意事项(points for attention)、平均值(average)、中心线(center line)
[单选题]轴与桨法兰连接者或无键连接者,检验间隔期为()。
A. 2年
B. 3年
C. 4年
D. 5年
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学习资料:
[单选题]轴系中心线产生同轴度偏差主要是由于()造成。
A. 艉轴管过度磨损
B. 艉轴过度磨损
C. 曲轴过度磨损
D. 艉轴承过度磨损
[单选题]更换艉轴承填料时的注意事项中不包括()。
A. A.填料长度适当,不许搭接或过短
B. B.各道填料的接缝要错开
C. C.压盖安装后应前后移动灵活、无卡阻
D. D.按要求依次上紧压盖螺母
[单选题]桨叶平均螺距为桨叶上各半径截面的()的算术平均值。
A. 局部螺距
B. 截面螺距
C. 总平均螺距
D. 平均螺距
[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]In diesel engines designed with a crosshead, the motion of the piston rod can be described as ().
A. reciprocating at the piston pin, rotary at the crank pin
B. reciprocating at the crank pin, rotary at the piston pin
C. straight reciprocation
D. straight rotatio
[单选题]Combustion knock occurring in a diesel engine can be caused by ().
A. excessive fuel penetration
B. prolonged injection lag
C. reduced ignition lag
D. prolonged ignition lag
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