單項選擇題A bronze bearing liner with a lead-tin flashing has a milky-white color over most of its surface and some areas of exposed bronze, the white coloring indicates（）

A.proper break-in wear
B.improper break-in wear
C.relocation of the overlay flashing
D.water contamination of the lube oil system


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1.單項選擇題If a diesel engine turned over freely but failed to start, the cause could be （）

A.water in the fuel
B.cold lube oil
C.excessive starting air pressure
D.excessive fuel pressure

2.單項選擇題If it becomes necessary to cutout an individual cylinder of a large, low-speed, main propulsion diesel engine, the fuel to that cylinder should be secured and its （）

A.fuel pump should be removed and all connections blanked off
B.cylinder oil feed rate should be increased slightly above that used at normal sea speed
C.cylinder oil feed rate should be reduced
D.cylinder oil feed rate should be increased to the maximum flow capable of the metering pump

3.單項選擇題The satisfactory operation of diesel engine exhaust valves usually depends on（）

A.the proper back pressure
B.the cooling water temperature
C.correct timing and proper seating
D.accurate metering and the exhaust temperature

4.單項選擇題If an auxiliary diesel engine frequently stalls, the trouble may be caused by （）

A.low exhaust back pressure
B.air in the fuel system
C.gasket blow-by or leakage
D.incorrect assembly of idler springs