【名词&注释】
填料函(stuffing box)、活塞杆填料、测量法(measurement)、弹簧测力计(spring loaded thrust meter)
[单选题]It is very necessary that each cylinder () before the charged air is compressed.
A. is scavenged
B. has been scavenged
C. be scavenged
D. was scavenged
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[单选题]对于活塞杆下端是方形法兰的机型如B&W,如只需解体活塞杆填料函则不需吊出活塞,在曲轴箱内拆掉填料函的()固定螺栓,用专用夹具夹住(),使整个填料函落在夹具的平板上,进行解体。
A. 外圈/活塞杆
B. 内、外圈/活塞杆
C. 外圈/填料函
D. 内、外圈/填料函
[单选题]实测中间轴承负荷的常用方法是()。
A. 弹簧测力计(spring loaded thrust meter)法
B. 顶举法
C. 电阻应变片测量法
D. A或B或C
[单选题]舵杆工作轴颈与舵叶轴承孔同轴度检验前,先将舵杆与舵叶组装在一起,并使()。
A. 舵杆与舵叶法兰结合面贴紧
B. 法兰连接螺栓中至少有4个紧配螺栓
C. 舵杆与舵叶法兰结合面贴紧或法兰连接螺栓中至少有4个紧配螺栓
D. 舵杆与舵叶法兰结合面贴紧和法兰连接螺栓中至少有4个紧配螺栓
[单选题]Charging-air pressure increases if there is incorrect combustion and drop in the () of the diesel engine.
A. machine efficiency
B. machinery efficiency
C. mechanical efficiency
D. mechanics efficiency
[单选题]For an ordinary four-stroke engine the exhaust valves open ().
A. after TDC
B. before TDC
C. after BDC
D. before BDC
[单选题]Low compression results from ().
A. a worn cylinder
B. broken piston rings
C. either A or B
D. none of the above
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