轴系校中状态发生变化主要包括轴系中心线的（）发生变化。Ⅰ.直线

【名词&注释】

增压器(turbocharger)、进出口(import and export)、平均值(average)、直线度(straightness)、中心线(center line)、锅炉蒸发量、动平衡试验(dynamic balance test)、发生变化

[单选题]轴系校中状态发生变化主要包括轴系中心线的（）发生变化。Ⅰ.直线度；Ⅱ.偏差度；Ⅲ.对中性；Ⅳ.同轴度；Ⅴ.曲折度。

A. Ⅱ＋Ⅳ
B. Ⅰ＋Ⅱ
C. Ⅰ＋Ⅱ＋Ⅲ
D. Ⅰ＋Ⅲ＋Ⅳ

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学习资料：

[单选题]与废气锅炉蒸发量D有正确关系的是（）。

A. 蒸汽焓值h越高，蒸发量D越大
B. 废气锅炉废气进出口温差（t1-t2）越小，蒸发量越大
C. 废气锅炉废气进口温度t1越高，蒸发量越大
D. 主机排气流量G越大，燕发量越小

[单选题]防止增压器振动的措施包括（）。Ⅰ.定期换新轴承；Ⅱ.定期清洗叶片；Ⅲ.定期检查安装间隙；Ⅳ.转子定期检查磨损和变形；Ⅴ.转子定期作动平衡试验^{(dynamic balance test)}。

A. Ⅰ＋Ⅱ＋Ⅲ＋Ⅳ＋Ⅴ
B. Ⅱ＋Ⅲ＋Ⅳ＋Ⅴ
C. Ⅰ＋Ⅲ＋Ⅳ
D. Ⅲ＋Ⅳ＋Ⅴ

[单选题]截面螺距是桨叶上（）的算术平均值。

A. 任两个截面上螺距
B. 各截面上螺距
C. 同一截面上局部螺距
D. 同一截面上部分螺距

[单选题]Engine fuel pump index is （）.

A. the viscosity index
B. the fuel oil contents
C. the starting speed
D. the reading at the rack

[单选题]On a diesel engine, fuel is delivered into the combustion space by （）.

A. a cooling system
B. a lubrication oil system
C. an electric system
D. an injection system

[单选题]For a continuous operation diesel engine, a duplex filter unit would be the best arrangement because （）.

A. changing filter elements would not interrupt engine operation
B. filtering occurs twice in each pass of oil through the system
C. clogging will not occur
D. dropping pressure is half of that through a single filter unit

[单选题]In a normally operating diesel engine, the main cause of lubricating oil contamination in the crankcase is a result of the （）.

A. metal particles loosened by wear
B. air when no air cleaners are used
C. condensation of water vapors
D. breakdown of the lubricating oil by dilutio

[单选题]The opening of an exhaust valve on a modem, large, low-speed, main propulsion diesel engine may be actuated by （）.

A. direct action of cam shaft
B. compressed air pressure
C. hydraulic “push rods”
D. direct action of the main piston moving dow

[单选题]A change in the degree of fuel atomization in a diesel engine would most greatly affect （）.

A. air turbulence
B. fuel penetration
C. fuel spray angle
D. fuel injection rate

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