滑油中含有过多的水分和酸时会导致曲轴轴颈产生（）。Ⅰ.裂纹；Ⅱ.

【名词&注释】

动力装置(power plant)、低速柴油机(low speed diesel engine)

[单选题]滑油中含有过多的水分和酸时会导致曲轴轴颈产生（）。Ⅰ.裂纹；Ⅱ.凹坑；Ⅲ.锈斑；Ⅳ.烧伤；Ⅴ.断裂。

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

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学习资料：

[单选题]推进装置的推进效率为推进轴上总有效功率与推进装置消耗的热量之比，因此它与（）无关。

A. 动力装置消耗的能量
B. 动力装置的余热利用
C. 推进装置的燃料消耗
D. A+B

[单选题]在检查（）的连杆大端轴承螺栓时，必须测量螺栓的拉伸长度。

A. 大型低速柴油机
B. 中、高速柴油机
C. 空气压缩机
D. 中高速及大型低速柴油机

[单选题]船轴腐蚀主要发生在（）。

A. 推力轴
B. 中间轴
C. 艉轴
D. 曲轴

[单选题]A: Please tell me the specifications and quantity.B: （）

A. Pump diesel oil first
B. 300 tons of 180 cst fuel oil
C. The figure is all right
D. OK, I’ll sign it

[单选题]The main moving parts of a diesel engine consist of the （） and the pistons.

A. bedplate, connecting rods
B. crankshaft, the connecting rods
C. frames, crossheads
D. crankshaft, the cylinder

[单选题]Vee-type engines have the connecting rods from two cylinders connected to each （） of the crankshaft.

A. throw
B. web
C. main bearing
D. deflectio

[单选题]The possibility of damage from operating a diesel engine at critical speeds is reduced by the use of（）.

A. an isochronous governor
B. elastic engine mounts
C. a vibration damper
D. a cast iron bed plate with good flexible qualitie

[单选题]If fuel injection to a four-stroke/cycle diesel engine begins earlier than designed, ignition may be delayed because the （）.

A. cylinder compression pressure may not be high enough
B. cylinder compression temperature may be too high
C. fuel oil injection pressure may not be high enough
D. scavenge and purge process is incomplete

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