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單項選擇題

In a diesel engine, when installing new piston rings it is important to check（）
Ⅰ.ring gap clearance
Ⅱ.side clearance

A.Ⅰ only
B.Ⅱ only
C.both Ⅰ and Ⅱ
D.neither Ⅰnor Ⅱ

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單項選擇題

At bottom dead center, the centerline of the connecting rod usually coincides with the（）

A.angularity of the piston motion
B.inertia moment from the piston
C.centerline of the cylinder
D.centerline of the king pin

單項選擇題

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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