单项选择题
Valves in the cylinder head of a diesel engine are opened by the direct action of the（）
A.exhaust pressure
B.valve spring pressure
C.rocker arm movement
D.wrist pin movement
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相关考题
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单项选择题
On a large diesel engine installation, crankshaft axial alignment is maintained by the （）
A.piston rod guides
B.engine thrust bearing
C.crosshead bearing
D.main shaft flexible coupling -
单项选择题
A piston is said to be at top dead center when it is （）
A.opening the exhaust ports
B.placed on top of the engine along its centerline
C.farthest from the cylinder head
D.nearest to the cylinder head -
单项选择题
During which of the listed piston stroke of a four-stroke/cycle diesel engine, is the piston moving downward?（）
A.Intake stroke
B.Compression stroke
C.Exhaust stroke
D.Pumping stroke
