In a purifier, the interface between the liquid seal and the

【名词&注释】

柴油机机座(diesel engine frame)

[单选题]In a purifier, the interface between the liquid seal and the oil should be positioned as close as possible to （）.

A. the outlet of oil
B. the outlet of water
C. the bowl periphery
D. the center of bowl

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[单选题]底脚螺栓的作用是将（）牢牢地固定在一起。Ⅰ.柴油机机座；Ⅱ.船体双层底底座；Ⅲ.固定垫块；Ⅳ.活动垫块。

A. Ⅰ＋Ⅱ
B. Ⅰ＋Ⅱ＋Ⅲ
C. Ⅰ＋Ⅱ＋Ⅲ＋Ⅳ
D. Ⅰ＋Ⅱ＋Ⅳ

[单选题]压气机叶片损伤是由于（）造成的。Ⅰ.轴承严重磨损；Ⅱ.吸入硬质颗粒；Ⅲ.气流冲击；Ⅳ.振动；Ⅴ.碰撞。

A. Ⅱ＋Ⅳ
B. Ⅰ＋Ⅱ＋Ⅴ
C. Ⅲ＋Ⅳ＋Ⅴ
D. Ⅰ＋Ⅱ＋Ⅳ＋Ⅴ

[单选题]总偏移是（）。

A. 从曲轴输出端法兰开始平轴，在艉轴首端法兰处所测得的偏移值
B. 从艉轴首端法兰开始平轴，在曲轴输出端法兰处所测得的偏移值
C. A或B
D. 以曲轴输出端法兰为基准测得的偏移值

[单选题]按舵的旋转轴线的位置不同将舵系分为（）种。

A. A．2
B. B．3
C. C．4
D. D．5

[单选题]（） is not properly set thus causing either advanced or retarded firing.

A. A piston
B. A fuel injection pump
C. A feed water pump
D. A lube oil pum

[单选题]During the fuel injection period, fuel pressure must exceed cylinder gas pressure to （）.

A. ensure penetration and distribution of the fuel in the combustion chamber
B. ensure the needle valve is flushed clean during each injection
C. prevent combustion gas blowback into the open needle valve
D. prevent reflected pressure waves when the needle valve close

[单选题]To minimize corrosion, fuel oil strainer disks, spacers and scraper blades are made of （）.

A. brass
B. copper
C. iron
D. monel metal or stainless steel

[单选题]One major disadvantage of a low-speed diesel as compared to a steam main-propulsion system is（）.

A. the extra weight required for the diesel reduction gearing
B. a minimum speed for the engines that limits the minimum speed of the vessel
C. the higher fuel consumption per SHP
D. the low efficiency of the system when a controllable pitch propeller is used

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