【名词&注释】
润滑油(lubricating oil)、液压油(hydraulic oil)、活塞环(piston ring)、超负荷(overload)、柴油机气缸套(engine cylinder liner)、轻柴油(light diesel oil)、面粗糙度(surface roughness)
[单选题]为了实现柴油机的设计性能和可靠运转,必须保证()。
A. A.固定件的相对位置的精度
B. B.活塞运动部件的相对位置精度
C. C.固定件的相对位置的精度和活塞运动部件的相对位置精度
D. D.活塞运动部件的对中性
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学习资料:
[单选题]柴油机气缸套与活塞环工作表面间油膜变薄或遭到破坏,是由于()等因素造成。Ⅰ.润滑不良;Ⅱ.活塞运动装置对中不良;Ⅲ.冷却不良;Ⅳ.超负荷;Ⅴ.工作表面粗糙度(surface roughness)低。
A. A.Ⅰ+Ⅱ+Ⅳ+Ⅴ
B. B.Ⅰ+Ⅳ+Ⅴ
C. C.Ⅰ+Ⅱ+Ⅲ+Ⅳ+Ⅴ
D. D.Ⅰ+Ⅱ+Ⅲ
[单选题]液压拉伸器的液压系统中除应使用纯净的液压油外,还可使用()作为液压油。
A. 润滑油
B. 轻柴油(light diesel oil)
C. 透平油
D. 高级润滑油
[单选题]对于质量分布不在同一平面内,轴向长度较大的回转件,其平衡程度用()表示。
A. A.FR
B. B.e
C. C.e•ω
D. D.G
[单选题]水润滑艉轴承的长度应不小于()倍的艉轴直径。
A. 2
B. 3
C. 4
D. 5
[单选题]As a heat engine,() energy is the source of power by which the diesel engine can be operated.
A. electric
B. heat
C. mechanical
D. exhaust
[单选题]It is very important that each cylinder should be () scavenged before the charged air is compressed.
A. well
B. good
C. excellent
D. respectively
[单选题]The diameter of the crank-pins should be measured with a ().
A. salinometer
B. thermometer
C. tachometer
D. micrometer
[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]Which of the substances listed is satisfactorily removed from the fuel by a centrifugal oil purifier?()
A. Impurities
B. Lube oil
C. Gasoline
D. Diesel fuel
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