单项选择题
Which of the following operational conditions will occur to the diesel engine lube oil at extremely high temperature?（）
A.The oil oxidizes and forms carbon deposits
B.The viscosity increases
C.Engine oil consumption decreases
D.Lubricating qualities of the oil are enhanced
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相关考题
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单项选择题
The oxidation by-products forming in diesel engine lube oil can cause （）
A.pitting
B.sludge
C.hard varnish
D.all of the above -
单项选择题
Surface irregularities, such as erosion and pitting on injection pump plungers, will（）
A.increase ignition delay
B.affect fuel oil metering
C.affect engine performance at low speed
D.only disappear due to fuel oil abrasion -
单项选择题
Oil oxidation, as a result of excessively high lube oil temperature, is harmful to a diesel engine because （）
A.oil foaming will occur
B.large quantities of oil are consumed
C.lube oil viscosity is always decreased
D.corrosive by-products are usually formed
