單項(xiàng)選擇題Regarding a Diesel engine crankcase, the general arrangement and installation should preclude the possibility of （）

A.free entry of air to the crankcase
B.water entering the crankcase while engine wash-downs are being performed
C.excessive oil leakage during periods of increased blow-by
D.sub-cooling internal components


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1.單項(xiàng)選擇題If the valve tappets in a diesel engine are set at greater clearances than those specified by the engine manufacturer, those valves will （）

A.open late and close early
B.open late and close late
C.fail to open when the engine is cold
D.fail to open at normal operating temperature

2.單項(xiàng)選擇題Lubricating systems for diesel engines are usually designed to initially provide lube oil to the engine （）

A.camshaft beatings
B.main bearings
C.piston crowns
D.cylinder walls

3.單項(xiàng)選擇題The expansion tank in a diesel engine closed freshwater cooling system is located at （）

A.the highest point in the system
B.the lowest point in the system
C.near the floor
D.plate level or near the tank top level

4.單項(xiàng)選擇題On most modern diesel engines, the main and connecting rod bearings receive their lubricating oil by （）.

A.banjo feed
B.splash feed
C.gravity feed
D.pressure feed

5.單項(xiàng)選擇題The main function of tie rods in the construction of large, low speed diesel engines is to（）.

A.stiffen the bedplate in way of the main bearings to increase the engines longitudinal strength
B.accept most of the tensile loading that results from the firing forces developed during operation
C.mount the engine frame securely to the hull to prevent shaft coupling misalignment
D.connect the crosshead solidly to the piston rod