柴油机运转中，轮机员可根据气缸或活塞冷却水的（）直接迅速判断

【名词&注释】

冷却水(cooling water)、平均值(average)、压力表(pressure gauge)、穿透性裂纹、中国船级社(china classification society)、轮机员(engineer)

[单选题]柴油机运转中，轮机员^(engineer)可根据气缸或活塞冷却水的（）直接迅速判断零件上有无穿透性裂纹。Ⅰ.压力变化；Ⅱ.压力表指针波动；Ⅲ.水温变化；Ⅳ.流量变化；Ⅴ.膨胀水柜水位波动。

A. Ⅰ＋Ⅱ＋Ⅳ
B. Ⅰ＋Ⅱ＋Ⅴ
C. Ⅱ＋Ⅲ＋Ⅳ
D. Ⅱ＋Ⅲ

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学习资料：

[单选题]中国船级社^{(china classification society)}允许船舶曲轴臂距差的最大极限是（）mm（S为冲程，单位：mm）。

A. ＜0.125S
B. （0.125～0.25）S
C. ＜0.25S
D. ＜0.30S

[单选题]目前钢质海船建造时安装的轴系广泛采用（）。

A. 直线校中
B. 按轴承允许负荷校中
C. 合理校中
D. A或B或C

[单选题]桨叶上同一半径截面上的（）螺距的算术平均值称为该截面的截面螺距。

A. 部分
B. 局部
C. 全部
D. 任两个

[单选题]An overspeed safety device is usually fitted to a generator engine for （） in the event of overspeed.

A. cutting power off the engine
B. increasing the fuel pump setting
C. braking the crankshaft
D. stabilizing the ship speed

[单选题]If the engine does start on air, but combustion does not immediately begin, the cause may be （）.

A. failure of the fuel pumps
B. starting air pressure too low
C. stop valve in air line closed
D. the turning gear still engaged

[单选题]The cylinders, with cooling jackets, are （） to the engine frame by eight tie rods.

A. screwed
B. welded
C. fastened
D. rotated

[单选题]The most important factor that causes the wear of the engine parts is （）.

A. excessive heat
B. friction
C. oxidation
D. high pressure

[单选题]Which of the following statements describes the function of an expansion tank in a diesel engine cooling system?（）

A. Maintains a constant head on the system
B. Reduces the likelihood of air or steam pockets formation
C. Provides a low pressure point for the addition of makeup cooling water
D. All of the above

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