單項選擇題What function is provided by the crankcase ventilation system on some diesel engines?（）

A.Increases the sludge forming tendency of lube oil
B.Prevents the accumulation of combustible gases
C.Improves lube oil cooling
D.Improves cold weather starting


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1.單項選擇題Increasing the valve clearance between a valve stem and rocker arm, will result in the valve （）

A.closing later
B.opening sooner
C.staying open for a shorter period of time
D.staying open for a longer period of time

2.單項選擇題A diesel engine crankcase ventilation system （）

A.prevents spark generation
B.removes combustible gases
C.determines the level of combustible gases
D.provides inert gas generation in crankcase

3.單項選擇題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

4.單項選擇題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

5.單項選擇題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