【名词&注释】
阴极保护(cathodic protection)、防腐剂、极限值、电化学腐蚀(electrochemical corrosion)、活塞环(piston ring)、说明书(specification)、活塞杆(piston rod)、保护膜(protective film)、二冲程(two-stroke)
[单选题]当十字头式柴油机缸径>700mm时,在未装活塞环的条件下,活塞位于近上、下止点位置时,活塞裙部减磨环处与气缸内孔单边最小间隙应不小于()。
A. 该处总间隙的30%
B. 该处总间隙的20%
C. 说明书规定极限值的30%
D. 说明书规定极限值的20%
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学习资料:
[单选题]二冲程(two-stroke)十字头式柴油机活塞运动部件的平台检验主要是检查()零件间的相互位置关系。
A. 活塞和活塞杆(piston rod)
B. 十字头、滑块和连杆
C. 活塞运动部件
D. 机座固定件
[单选题]为了防止涡轮壳体电化学腐蚀,除用淡水冷却外,可以采用()等方法。Ⅰ.壳体表面覆盖保护膜(protective film);Ⅱ.阴极保护;Ⅲ.阳极保护;Ⅳ.淡水中加防腐剂;Ⅴ.安装防腐锌块。
A. Ⅱ+Ⅳ
B. Ⅰ+Ⅱ+Ⅳ+Ⅴ
C. Ⅰ+Ⅳ+Ⅴ
D. Ⅰ+Ⅱ+Ⅴ
[单选题]Care and cleanliness are required when installing diesel fuel filters ().
A. to prevent the fuel system from becoming air-hound
B. to prevent the fuel system becoming clogged with dirty particles
C. both of the above
D. to prevent the lubricating oil from leaking out of the filter element
[单选题]Fix the fuel injector into () after repair.
A. the cylinder liner
B. the cylinder cover
C. the cylinder jacket
D. the pisto
[单选题]Oil will lubricate these parts () effectively than water.
A. much
B. more
C. most
D. le
[单选题]While engine is in operation the piston moves up and down, thus causing the rotation of the ().
A. crankcase
B. slipper
C. cam housing
D. crankshaft
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