For an ordinary four-stroke engine the inlet valves open （

【名词&注释】

可靠性(reliability)、船舶动力装置(marine power plant)、活塞杆(piston rod)、静平衡(static balance)、螺旋桨桨叶(propeller blades)

[单选题]For an ordinary four-stroke engine the inlet valves open （）

A. after TDC
B. before TDC
C. after BDC
D. before BDC

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学习资料：

[单选题]船舶动力装置达到规定可靠性的有力保证是（）。

A. 备件的数量、质量符合“CCS”的规定
B. 提高轮机管理人员的水平
C. 监造时质量把关
D. 提高材料的质量

[单选题]在平台上用Ⅴ形铁支承活塞杆，检查活塞与活塞杆同轴度时，活塞转动一周，测得（）径向跳动即为同轴度误差。

A. 活塞裙部
B. 活塞头部
C. 活塞外圆
D. 同轴度

[单选题]合成材料艉轴承中以（）艉轴承应用日益增多。

A. 尼龙
B. 赛龙
C. 环氧树酯
D. 塑料

[单选题]除镍铝青铜桨外，其他材料的螺旋桨桨叶^{(propeller blades)}热校正之后应进行（）处理。

A. 着色探伤
B. 静平衡
C. 退火
D. 清洁

[单选题]The process of loop scavenge is that the exhaust will be via ports （） the air ports and controlled by the same piston.

A. behind
B. far from
C. adjacent to
D. in front of

[单选题]With respect to the flow of lubricating oil through a diesel engine, the lube oil coolers are located after filters in order to （）.

A. allow filtration of less viscous oil
B. decrease the pressure drop across the filter
C. improve overall filtration
D. all of the above

[单选题]The rate of heat transfer in a water-tube auxiliary boiler can be increased by （）.

A. operating the boiler at less than normal water level
B. installing fins on the firesides of water-tubes
C. increasing the amount of excess air to the burners
D. treating the boiler water with chemical oxygen scavenger

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