If the flame from combustion in the cylinder of a four-strok

【名词&注释】

超声波(ultrasonic)、螺旋桨鸣音

[单选题]If the flame from combustion in the cylinder of a four-stroke engine past the piston into the space below, the accumulation of flammable mixture would be ignited, thus resulting in （）.

A. the crankcase explosion
B. lifting of the cylinder safety valve
C. a scavenge fire
D. opening of the manhole

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学习资料：

[单选题]船轴表面裂纹可采用（）进行无损检测。Ⅰ.着色探伤；Ⅱ.煤油-白粉；Ⅲ.磁粉探伤；Ⅳ.超声波探伤；Ⅴ.X射线探伤。

A. Ⅱ＋Ⅲ
B. Ⅰ＋Ⅲ
C. Ⅰ＋Ⅲ＋Ⅴ
D. Ⅰ＋Ⅱ＋Ⅲ

[单选题]艉轴裂纹主要发生在（）等处。Ⅰ.法兰根部；Ⅱ.工作轴颈；Ⅲ.铜套接缝处轴颈；Ⅳ.键槽根部；Ⅴ.锥部大端截面变化。

A. Ⅱ＋Ⅲ
B. Ⅰ＋Ⅱ＋Ⅳ
C. Ⅲ＋Ⅳ＋Ⅴ
D. Ⅰ＋Ⅲ＋Ⅳ

[单选题]消除螺旋桨鸣音的办法是将随边0.4R～0.8R部分（），从而改变涡流引起的振动频率。

A. 质量改变
B. 形状改变
C. 改变尺寸
D. 改变螺距

[单选题]Bridge gauge can be used to measure （） of a diesel engine.

A. diameters of journals
B. deflections of crankwebs
C. diameters of crankpins
D. none of the above

[单选题]Fuel oil begins injection into the cylinder of a four-stroke/cycle diesel engine during the （）.

A. intake stroke
B. exhaust stroke
C. power stroke
D. compression stroke

[单选题]The jacket water temperature in a diesel engine closed freshwater cooling system is normally controlled by （）

A. regulating the level of corrosion inhibitor in the primary cooling system
B. the level of the freshwater expansion tank
C. varying the engine load to meet temperature requirements
D. the operation of the thermostatic valve

[单选题]Waterside scale in a fire-tube boiler may cause （）.

A. increased heat transfer
B. fireside erosion
C. high steam demand
D. overheated tube

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