Bearing knocks are likely to occur from （）.

【名词&注释】

填料函(stuffing box)、活塞杆填料、柴油机停机、运行时(run-time)

[单选题]Bearing knocks are likely to occur from （）.

A. less clearance
B. dirty lube oil
C. overload
D. bearing wear

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[单选题]活塞杆填料函的泄放管是与（）连通的，主机运行时^(run-time)可以从泄放管的工作状态判断填料函工作是否正常。

A. 下部密封环
B. 下部刮油环
C. 中部刮油环
D. 上部密封环

[单选题]在柴油机已装活塞运动部件的情况下测量臂距值时，为了准确测量臂距值（）。

A. 盘车一周应测完5个数值
B. 测量中拐挡表安装次数不限
C. 柴油机停机后即可测量
D. 可在任意位置开始测量

[单选题]舵承孔同轴度偏差过大时，可采取（）措施。

A. 更换舵承衬套
B. 偏镗舵承孔衬套
C. 衬套需可靠定位以防转动
D. 镗削全部舵承衬套

[单选题]（） fuel oils （） lubricating oils require treatment before passing to the engine.

A. Both；and
B. Neither；nor
C. Either；or
D. Both；or

[单选题]The main bearings are provided with thin-walled （）, lined with a copper-lead alloy.

A. steel guides
B. steel shells
C. steel bearing caps
D. pig iro

[单选题]The sequence of parts in a generally used fuel oil supply system for a main engine is （）(1)tanks in the double bottom(2)centrifuges(3)service tank(4)settling tank(5)viscosity regulator

A. (1)-(2)-(4)-(3)-(5)
B. (1)-(4)-(2)-(3)-(5)
C. (1)-(3)-(2)-(4)-(5)
D. (1)-(5)-(4)-(2)-(3)

[单选题]The highest pressure in a diesel engine cylinder normally occurs （）.

A. at TDC
B. before TDC
C. after TDC
D. during air starting

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