问题：
[单选] On most modern diesel engines, the main and connecting rod bearings receive their lubricating oil by （）.
banjo feed。splash feed。gravity feed。pressure feed。
问题：
[单选] Lubricating systems for diesel engines are usually designed to initially provide lube oil to the engine （）
camshaft beatings。main bearings。piston crowns。cylinder wall。
问题：
[单选] Regarding a Diesel engine crankcase, the general arrangement and installation should preclude the possibility of （）
free entry of air to the crankcase。water entering the crankcase while engine wash-downs are being performed。excessive oil leakage during periods of increased blow-by。sub-cooling internal component。
问题：
[单选] A diesel engine crankcase ventilation system （）
prevents spark generation。removes combustible gases。determines the level of combustible gases。provides inert gas generation in crankcase。
问题：
[单选] Increasing the valve clearance between a valve stem and rocker arm, will result in the valve （）
closing later。opening sooner。staying open for a shorter period of time。staying open for a longer period of time。
问题：
[单选] What function is provided by the crankcase ventilation system on some diesel engines?（）
Increases the sludge forming tendency of lube oil。Prevents the accumulation of combustible gases。Improves lube oil cooling。Improves cold weather starting。
问题：
[单选] Lubricating oil is supplied to the crank-pin bearings in a marine diesel engine by （）.
internal crankshaft passages。immersion in oil。splash lubrication。injection lubricatio。
问题：
[单选] The fuel supply system to an automatic auxiliary boiler, will be automatically shutdown if the boiler （）
salinity is abnormally high。steam demand is too high。water level is abnormally low。feedwater flow is low。
问题：
[单选] In readying an auxiliary water-tube boiler for a routine hydrostatic test, which of the following procedures should be undertaken prior to filling the boiler with fresh water?（）
The safety valve escape piping should be disconnected from the valve body and a blank inserted。The boiler vent valves should be opened。All handhole/manhole covers should be tightened up as much as possible to preclude any leaks。All of the above。
问题：
[单选] Which of the following conditions could cause the feed pump for an auxiliary boiler to lose suction?（）
Increased suction head pressure。Decreased feedwater temperature。Pump recirculating line being open too much。Excessive feedwater temperature。
