造成产品出现早期故障期的原因（）。Ⅰ.设计上的缺陷；Ⅱ.制造上的

【名词&注释】

螺旋桨(propeller)、柴油机(diesel engine)、不合适(inconcinnity)、中心线(center line)

[单选题]造成产品出现早期故障期的原因（）。Ⅰ.设计上的缺陷；Ⅱ.制造上的缺陷；Ⅲ.使用中磨合不合适

A. Ⅰ+Ⅱ
B. Ⅰ+Ⅲ
C. Ⅱ+Ⅲ
D. Ⅰ+Ⅱ+Ⅲ

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学习资料：

[单选题]现代柴油机排烟温度下降，不利于废气锅炉的余热利用，因此规定废气锅炉设计的标定工况是：废气锅炉排气进口温度t1为（）℃，出口温度t2为（）℃。

A. 400/300
B. 300/200
C. 255/188
D. 200/165

[单选题]检测轴系中心线^{(center line)}状态发现δ总和φ总均严重超差，应采取（）的措施进行调整。

A. 偏镗艉轴管
B. 移动主机
C. 调节中间轴承位置
D. 同时调整艉轴和主机的位置

[单选题]艉轴管装置的主要作用是（）。Ⅰ.支承，Ⅱ.减磨，Ⅲ.密封，Ⅳ.散热，Ⅴ.构成轴系。

A. Ⅱ＋Ⅲ
B. Ⅰ＋Ⅱ＋Ⅳ
C. Ⅲ＋Ⅳ＋Ⅴ
D. Ⅰ＋Ⅲ

[单选题]测量螺旋桨螺距时采用的量具是（）。

A. 螺距规
B. 直尺
C. 塞尺
D. 桥规

[单选题]The cooling of the piston is carried out by circulating （） across the underside of the crown and inside the ring belt or through specially shaped passages.

A. sea water
B. scavenging air
C. lubricating oil
D. fuel oil

[单选题]The cooling water temperature （） over a period of 8 hours, and then shut down.

A. should be gradually increased
B. should be gradually reduced
C. should be constantly kept
D. should be varied up and dow

[单选题]The rim of the piston may contain cut-out portions to accommodate （） when they open.

A. the gases
B. the air
C. the valves
D. the injector

[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]Suppose the rated capacity of the main engine of a ship is 10,000 KW at 100 rated rpm, then when at 80 rpm its capacity should be （）.

A. 800 KW
B. 5120 KW
C. 6400 KW
D. 4180 KW

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