【名词&注释】
异常现象(abnormal phenomena)、柴油机气缸套(engine cylinder liner)、二冲程柴油机(two-stroke diesel engine)、穿透性裂纹、螺旋桨桨叶(propeller blades)、冷却水温(cooling water temperature)、曲轴箱油(crankcase oil)、一般情况下(in general case)
[单选题]二冲程柴油机气缸套产生穿透性裂纹,柴油机运转时就会发现()异常现象。
A. A.冷却水温(cooling water temperature)度升高
B. B.膨胀水柜水位波动
C. C.滑油乳化变质
D. D.曲轴箱油(crankcase oil)位升高
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学习资料:
[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
[单选题]一般情况下(in general case),要求针阀的锥角较阀座的锥角大()。
A. A.0.5°~1.0°
B. B.1.0°~1.5°
C. C.1.5°~2.0°
D. D.2.0°~2.5°
[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]船轴磨损后应检测其()。
A. 圆度误差
B. 圆柱度误差
C. 工作轴颈
D. 轴颈
[单选题]螺旋桨桨叶B区内的较小缺陷,深度<t为/30(t为叶厚,mm)或3mm可以采用()其中较大的缺陷。
A. 修磨
B. 焊补
C. 粘接
D. 金属扣合工艺
[单选题]Once a fire is detected the engine should be slowed downOn no account ().
A. the trunking should be opened up
B. should the trunking be opened up
C. the trunking should not be opened up
D. should the trunking not be opened u
[单选题]The () in the injector will lift at a pre-set pressure which ensures that the fuel will atomize once it enters the cylinder.
A. needle valve
B. nozzles
C. piston
D. spring
[单选题]The conclusion that mechanical efficiency is always () 100 percent is correct.
A. small than
B. more than
C. little than
D. less tha
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