單項(xiàng)選擇題The fuel supply system to an automatic auxiliary boiler, will be automatically shutdown if the boiler （）

A.salinity is abnormally high
B.steam demand is too high
C.water level is abnormally low
D.feedwater flow is low


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1.單項(xiàng)選擇題Lubricating oil is supplied to the crank-pin bearings in a marine diesel engine by （）.

A.internal crankshaft passages
B.immersion in oil
C.splash lubrication
D.injection lubrication

2.單項(xiàng)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

3.單項(xiàng)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

4.單項(xiàng)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

5.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