【名词&注释】
低碳钢(low carbon steel)、摩擦力(friction)、中碳钢(medium carbon steel)、滚动轴承钢、气缸中心线
[单选题]为了满足工作要求,活塞销的材料一般选用()并经渗碳、淬火和低温回火处理。Ⅰ.低碳钢(15钢);Ⅱ.中碳钢(35钢);Ⅲ.合金调质钢;Ⅳ.滚动轴承钢(GCr15);Ⅴ.合金渗碳钢(20Cr)。
A. A.Ⅰ+Ⅱ+Ⅴ
B. B.Ⅰ+Ⅴ
C. C.Ⅱ+Ⅴ
D. D.Ⅰ+Ⅲ+Ⅴ
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学习资料:
[单选题]在进行活塞运动部件校中时,必须测量()。
A. 曲轴的臂距差
B. 滑块与导板的间隙
C. 连杆大小端轴承的径向间隙
D. 导板平面与气缸中心线的平行度
[单选题]十字头式柴油机应进行活塞运动部件与固定件()校中。
A. A.横向
B. B.纵向
C. C.横向和纵向
D. D.规定要求的
[单选题]常见气阀的损伤有()等。Ⅰ.气阀阀盘锥面;Ⅱ.阀面的烧伤与高温腐蚀;Ⅲ.阀盘与阀杆的裂纹;Ⅳ.阀杆的弯曲变形;Ⅴ.阀杆的磨损。
A. Ⅰ+Ⅱ+Ⅲ
B. Ⅰ+Ⅲ+Ⅳ+Ⅴ
C. Ⅰ+Ⅱ+Ⅲ+Ⅴ
D. Ⅰ+Ⅱ+Ⅲ+Ⅳ+Ⅴ
[单选题]轴系中心线的偏差度应()。
A. 小于允许值
B. 大于允许值
C. 交点在δmax-φmax三角形内
D. 交点在δmax-φmax三角形外
[单选题]操舵轻快、航向失控的原因可能是()。Ⅰ.舵承配合间隙过大;Ⅱ.舵承损坏;Ⅲ.舵叶丢失;Ⅳ.舵杆折断;Ⅴ.舵承的摩擦力小。
A. Ⅰ+Ⅱ
B. Ⅰ+Ⅳ+Ⅴ
C. Ⅱ+Ⅳ+Ⅴ
D. Ⅲ+Ⅳ
[单选题]An increase in load on a diesel engine results in () of speed of the crankshaft.
A. a reduction
B. an increase
C. an outing
D. a downward
[单选题]Before starting the turning gear, () should be worked by hand to minimize corrosive action on the liners.
A. the indicators
B. the starting valves
C. the cylinder lubricators
D. the turning gear
[单选题]Put in the engine turning gear Now examine thoroughly inside the crankcase to () that everything is correct.
A. make sure
B. be sure
C. assure
D. believe
[单选题]The piston ring grooves for a standard engine are ()
A. chromium-plate against wear
B. anti-corrosion treated
C. white metal lined against wear
D. flame hardened against wear
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