【名词&注释】
耐磨性(wear resistance)、水冷却系统(water cooling system)、绝缘性(insulating)、压缩空气系统(compressed air system)、填料函(stuffing box)、活塞杆填料
[单选题]在水平平面内,当曲柄的两个主轴承位置偏左,曲轴轴线呈左弧线弯曲(即呈“(”形)时,该曲柄的臂距差Δ-为()值。
A. 正
B. 负
C. 零
D. 正或零
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学习资料:
[单选题]动力系统包括下列管路系统()。
A. 燃油、滑油系统
B. 海、淡水冷却系统
C. 蒸汽、压缩空气系统
D. A+B+C
[单选题]活塞杆填料函(stuffing box)安装在气缸底板中心孔中,具有()的作用。Ⅰ.密封扫气空气;Ⅱ.密封燃气;Ⅲ.除油污;Ⅳ.除积炭;Ⅴ.分隔。
A. A.Ⅰ+Ⅱ+Ⅴ
B. B.Ⅰ+Ⅴ
C. C.Ⅱ+Ⅴ
D. D.Ⅰ+Ⅲ+Ⅴ
[单选题]相邻轴轴心线相交,但相邻轴两法兰中心未对准,其连接法兰处偏中值为()。
A. δ=0、φ=0
B. δ=0、φ≠0
C. δ≠0、φ=0
D. δ≠0、φ≠0
[单选题]桦木层压胶木是铁梨木的代用材料,具有材质致密、坚硬、耐热、绝缘性好、成材率高,缺点是()。Ⅰ.耐磨性差;Ⅱ.耐蚀性差;Ⅲ.耐水浸性差;Ⅳ.刚性差;Ⅴ.脆性大。
A. Ⅱ+Ⅲ
B. Ⅰ+Ⅴ
C. Ⅱ+Ⅴ
D. Ⅱ+Ⅳ
[单选题]对短轴系轴线校中理解错误的是()。
A. 刚惟好
B. 挠度小
C. 对轴系偏差敏感
D. 对轴系偏差不敏感
[单选题]In the sentence “In some designs the cylinder oil is timed so that the oil injects only on the piston ring belt, the "piston ring belt" means ().
A. piston crown
B. piston ring groove
C. piston skirt
D. piston ring area
[单选题]The hot expanding gas rotates the blades of the exhaust turbine, thus () a large of its power, () drives the compressor.
A. to give off;which
B. giving off;which
C. to give off;that
D. giving off;that
[单选题]Which term describes piston pins having bearing surfaces in both the piston bosses and connecting rod eye?()
A. Stationary
B. Full floating
C. Semi-floating
D. Free rolling
[单选题]Electrically operated safety devices on auxiliary diesel engines function to stop the engine by ().
A. increasing the volume of intake air
B. shutting off the fuel supply
C. increasing the engine back pressure
D. over-speeding the engine
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