【名词&注释】
磨损率(wear rate)、塑性变形(plastic deformation)、柴油机(diesel engine)、液压油(hydraulic oil)、气缸套(cylinder liner)
[单选题]柴油机气缸盖的结构特点是()。Ⅰ.结构复杂;Ⅱ.阀件多;Ⅲ.孔道较多;Ⅳ.受热不均;Ⅴ.壁厚不均。
A. Ⅱ+Ⅲ+Ⅴ
B. Ⅰ+Ⅲ+Ⅴ
C. Ⅰ+Ⅲ
D. Ⅲ+Ⅴ
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学习资料:
[单选题]柴油机镀铬气缸套(cylinder liner)正常磨损率应在()mm/kh范围内。
A. 0.1~0.3
B. 0.05~0.1
C. 0.01~0.03
D. 0.005~0.01
[单选题]液压拉伸器是利用油压使螺栓()后轻易地上紧或松脱螺栓。
A. 受拉
B. 产生变形
C. 产生弹性变形
D. 产生塑性变形
[单选题]某些新型大型低速柴油机的气缸盖上,设有用来拆卸缸盖螺帽的液压装置(液压环)和配备了专用环形六角扳手,该扳手的作用是()。
A. 通入液压油时,用来松紧缸盖螺帽
B. 液压装置失效时,用来松开缸盖螺帽
C. 液压装置失效时,用来上紧缸盖螺帽
D. 通入液压油时,用来松紧缸盖螺帽和液压装置失效时,用来上紧缸盖螺帽
[单选题]当船轴上的裂纹深度不大于轴径的5%,长度不大于轴径的10%时,可采用()修理。
A. A.修磨
B. B.金属扣合工艺
C. C.焊补
D. D.光车后镀铁
[单选题]舵杆纵向裂纹应采用()修理。
A. 修刮
B. 焊补
C. 粘接
D. 更换
[单选题]After passing through the turbine the exhaust gas is conducted out into the().
A. intercooler
B. compressor
C. cylinder
D. open air
[单选题]Charging-air pressure increases if there is incorrect combustion and drop in the () of the diesel engine.
A. machine efficiency
B. machinery efficiency
C. mechanical efficiency
D. mechanics efficiency
[单选题]If the needle valve in a fuel injection nozzle sticks open ().
A. no fuel will be delivered through the nozzle
B. the nozzle will overheat and crack
C. time of injection will change
D. fuel will leak into the drain line
[单选题]Which of the following would cause a diesel to have black smoke?()
A. leaky injector
B. water in the gas
C. too heavy oil
D. water in the oil
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