A diesel engines crankcase oil level is found to be too high

【名词&注释】

柴油机(diesel engine)

[单选题]A diesel engines crankcase oil level is found to be too high√ You should suspect that （）.

A. the engine was over filled
B. there might be a fuel leak
C. there might be a water leak
D. all of the above

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学习资料：

[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（）。

A. 30%
B. 20%
C. 10%
D. 5%

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

A. on top cover
B. on sides of bowl
C. in drain line on the discs
D. on the disc

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

A. cylinder cover
B. cross-head shoes
C. guide-ways
D. scavenging boxe

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

A. is always less than 100%
B. is always more than 100%
C. is always equal to 90%
D. is always less than 90%

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

A. drain cocks
B. vent valves
C. counteracts
D. 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 （）.

A. metal particles loosened by wear
B. air when no air cleaners are used
C. condensation of water vapors
D. breakdown of the lubricating oil by dilutio

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

A. visual inspection of the elements
B. the pressure drop across the filter
C. high lube oil sump temperature
D. decrease in oil viscosity from the filter

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