单项选择题
Which of the following problems represent one possible cause of high lube oil consumption in a four stroke diesel engine?（）
A.Worn intake valve guides
B.Pitted pre-combustion chambers
C.Loose valve tappets
D.High exhaust back pressure
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相关考题
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单项选择题
Late fuel oil injection in a diesel engine can result in （）
A.fuel knock
B.increased power
C.low compression pressure
D.high exhaust temperature -
单项选择题
A crankshaft whose center of gravity coincides with its center line is said to be（） Ⅰ.statically balanced Ⅱ.dynamically balanced
A.Ⅰ only
B.Ⅱ only
C.both Ⅰ and Ⅱ
D.neither Ⅰ nor Ⅱ -
单项选择题
In a trunk type diesel engine piston, the thickness of the head or crown is determined by the（） Ⅰ.statically balanced Ⅱ.heat dissipation requirement
A.Ⅰ only
B.Ⅱ only
C.both Ⅰ and Ⅱ
D.neither Ⅰ nor Ⅱ
