單項選擇題The intake ports of a two-strike/cycle diesel engine are opened and closed by the action of the （）

A.camshaft
B.piston movement
C.exhaust valves
D.vertical drive


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1.單項選擇題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

2.單項選擇題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

3.單項選擇題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

4.單項選擇題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

5.單項選擇題A piston is at bottom dead center when it is（）

A.opening the exhaust ports
B.closing the fuel ports
C.farthest from the cylinder head
D.nearest to the cylinder head