【名词&注释】
柴油机(diesel engine)、性能参数(performance parameter)、气缸套(cylinder liner)、不允许(not allow)、发生变化、填料函式
[单选题]气缸套的内径增量ΔD=()(D为名义直径)。
A. Dmax-D
B. Dmax-Dmin
C. D-Dmax
D. D-Dmin
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[单选题]主机主轴承磨损后,()性能参数发生变化。Ⅰ.臂距差;Ⅱ.桥规值;Ⅲ.轴承间隙;Ⅳ.曲轴轴线状态;Ⅴ.主轴颈下沉量。
A. Ⅰ+Ⅱ+Ⅲ+Ⅳ
B. Ⅰ+Ⅱ+Ⅳ
C. Ⅰ+Ⅱ+Ⅲ+Ⅳ+Ⅴ
D. Ⅰ+Ⅱ+Ⅲ
[单选题]当气阀阀面出现麻点、腐蚀时可采用()工艺修复。
A. 机械加工
B. 喷涂或喷焊
C. 电弧堆焊
D. 以上均可
[单选题]在柴油机投入使用一年或大修后,一般均要进行一次贯穿螺栓预紧力检查,检查时()。
A. A.应当松开全部的主轴承螺栓
B. B.应当松开全部底脚螺栓
C. C.不允许松开任何底脚螺栓和贯穿螺栓
D. D.应当松开全部的底脚螺栓和贯穿螺栓
[单选题]水润滑艉轴承首端设置填料函式密封装置是为了()。
A. 防止艉轴承过分冷却
B. 防止海水流入机舱
C. 使艉轴承润滑均匀
D. 减少艉轴承磨损
[单选题]The cylinder and piston must be warmed up () to a temperature of about 140 degF in standing by engine.
A. repeatedly
B. quickly
C. gradually
D. immediately
[单选题]With four-stroke engines, it takes four revolutions of the crank shaft to make () power stroke(s).
A. 1
B. 2
C. 4
D. 8
[单选题]() into the cylinder because no fuel can burn () it.
A. Air must be admitted;without
B. Oil must be injected;without
C. Air must be admitted;with
D. Oil must be injected;with
[单选题]The jacket water temperature in a diesel engine closed freshwater cooling system is normally controlled by ()
A. regulating the level of corrosion inhibitor in the primary cooling system
B. the level of the freshwater expansion tank
C. varying the engine load to meet temperature requirements
D. the operation of the thermostatic valve
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