In a diesel engine, fuel must be broken up into a spray of f

【名词&注释】

柴油机(diesel engine)、中心线(center line)、喷油器雾化不良

[单选题]In a diesel engine, fuel must be broken up into a spray of fine droplets to （）.

A. increase its quality
B. obtain complete burning
C. reduce its weight
D. all of the above

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学习资料：

[单选题]高效废气锅炉与现代节能柴油机的匹配不当是废气锅炉烟垢着火呈上升趋势的原因，不属于匹配问题的原因是（）。

A. 柴油机喷油器雾化不良
B. 锅炉受热面大，废气流速低
C. 柴油机目前都使用劣质燃油
D. 船舶装载不足，柴油机长期低负荷运行

[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]Before "stand-by" is rung on the engine telegraph, it is usual to give the main engine （） ahead and astern.

A. a brief trial with turning gear
B. a brief trial on power
C. a long trial by steering gear
D. one minutes trial with windla

[单选题]Factor influencing the position of the interface between the liquid seal and the oil in a purifier is （）.

A. throughput
B. back pressure
C. gravity disc
D. None of the above is wrong

[单选题]Fuel injectors used in heavy fuel oil systems are usually provided with cooling to reduce（）.

A. cold corrosion of the nozzles
B. fuel viscosity for better atomization
C. carbon accumulation on the nozzles
D. fuel detonation in the cylinder

[单选题]The term “proper metering”, as applied to a diesel fuel injection system, can be best defined as （）.

A. delivering the same quantity of fuel to each cylinder for each power stroke according to engine load
B. maintaining the metering adjustment for a reasonable period under all load conditions
C. timing fuel injection to obtain maximum power and good fuel economy
D. distributing the fuel to all parts of the combustion chamber for proper combustio

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