油润滑艉轴承材料常采用（）耐磨合金。

【名词&注释】

柴油机(diesel engine)、铜铅合金(copper-lead alloy)、锡铝合金(sn-al alloy)

[单选题]油润滑艉轴承材料常采用（）耐磨合金。

A. 铜铅合金
B. 锡青铜
C. 高锡铝合金
D. 白合金

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学习资料：

[单选题]废气锅炉窄点越（），排气的压力损失较（），废气流速必须（）。

A. 小/小/提高
B. 小/大/降低
C. 大/小/降低
D. 大/大/降低

[单选题]柴油机气缸盖产生裂纹后，在分析产生裂纹原因时首先要检查的是（）的问题。Ⅰ.制造质量；Ⅱ.设计；Ⅲ.材质；Ⅳ.管理；Ⅴ.保养。

A. Ⅰ＋Ⅱ＋Ⅲ＋Ⅳ
B. Ⅰ＋Ⅱ
C. Ⅰ＋Ⅱ＋Ⅲ
D. Ⅳ＋Ⅴ

[单选题]活塞销的主要损坏形式是（）。Ⅰ.磨损；Ⅱ.摩擦；Ⅲ.擦伤；Ⅳ.腐蚀；Ⅴ.裂纹。

A. Ⅰ＋Ⅱ＋Ⅴ
B. Ⅰ＋Ⅴ
C. Ⅱ＋Ⅴ
D. Ⅰ＋Ⅲ＋Ⅴ

[单选题]Cooling of engine is achieved by circulation a cooling liquid around internal passages within the （）.

A. boiler
B. heater
C. engine
D. cooler

[单选题]During the inspection, the starting air valves should be closed （） the engine from turning.

A. to increase
B. to speed up
C. to prevent
D. to reduce

[单选题]Shims of different thicknesses are inserted between the shells to enable adjustment of （）.

A. the bearing clearances
B. the bearing thickness
C. the bearing strength
D. the bridge hardne

[单选题]The diesel engine is a type of （）.

A. turbine engine
B. gas turbine
C. steam engine
D. internal combustion engine

[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]Cylinder lubrication oil for low speed main propulsion diesel engines is admitted to each cylinder during （）.

A. the power stroke
B. the compression stroke
C. low load operation only
D. periods of standby

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