为了提高船舶动力装置的经济性，（）部门应对整个动力装置进行综

【名词&注释】

柴油机(diesel engine)、经济性(economy)、船舶动力装置(marine power plant)、存在着(there are)

[单选题]为了提高船舶动力装置的经济性，（）部门应对整个动力装置进行综合分析。

A. 设计
B. 制造
C. 使用
D. A+B+C

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学习资料：

[单选题]船舶有效功率与主机有效功率的差值，是存在着^{(there are)}（）所造成的。

A. 能量转换损失
B. 能量传递损失
C. 热量转换损失
D. A+B

[单选题]柴油机排气系统的背压与（）。Ⅰ.废气流速的平方成正比；Ⅱ.与管径的4次方成反比

A. 仅Ⅰ对
B. 仅Ⅱ对
C. Ⅰ，Ⅱ都对
D. Ⅰ，Ⅱ都不对

[单选题]During （）, the starting air valves should be closed to prevent the engine from turning.

A. overhaul
B. running
C. blowing down
D. All of the above are correct

[单选题]The lubricating system for the cylinder walls is different from the bearings in that the oil for former one is supplied in （） while that for latter one is （）.

A. sufficient quantity； measured
B. measured quantity；sufficient
C. excessive quantity；sufficient
D. the less quantity the better；the more the better

[单选题]Prior to lighting off a cold automatically fired auxiliary boiler, you should （）.

A. check and regulate the water level
B. close the air cock once fires are lit
C. blowdown the gage glass
D. crack the steam stop to assure protective steam flow

[单选题]In a bypass type lubrication system for a diesel engine, the dirty oil line to the centrifuge should be taken from the （）.

A. lube oil pump suction line
B. lube oil pump discharge line
C. bottom of the lube oil sump
D. outlet from the lube oil header

[单选题]Exhaust valve grooving and corrosion is caused by certain components of residual fuel oilThese components are sodium, sulfur, and （）.

A. vanadium
B. carbon
C. copper
D. ash

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