正确答案: D

all of the above

题目：A diesel engines crankcase oil level is found to be too high√ You should suspect that （）.

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学习资料的答案和解析：

[单选题]废气涡轮增压器使柴油机的功率增加一倍，而重量只增加（）。

10%

[单选题]Sediment collects in a tubular purifier （）.

on sides of bowl

[单选题]The cast iron（）for the cross-head are attached to the top section and seal off the crankcase.

guide-ways

[单选题]The mechanical efficiency of an engine （） because losses occur in the form of friction.

is always less than 100%

[单选题]The starting air system usually has （） to prevent starting if anything is not in order.

interlock

[单选题]In a normally operating diesel engine, the main cause of lubricating oil contamination in the crankcase is a result of the （）.

breakdown of the lubricating oil by dilutio

[单选题]A dirty diesel engine oil filter element can best be detected by （）.

the pressure drop across the filter