單項(xiàng)選擇題If the detergent type lubricating oil being used in a diesel engine is black, the oil （）

A.must be centrifuged
B.must by filtered
C.must be changed
D.is holding finely dispersed carbon in suspension


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1.單項(xiàng)選擇題Which of the following statements describes the results of excessive microbiological growths within a fuel system?（）

A.all excessive amounts of growth will cause the main engines of the vessel to stall due to the inability to supply the proper quantities of fuel to satisfy the existing load
B.The deposits produced by these growths form blockages and flow restrictions ultimately leading to improper atomization of the fuel into the cylinders
C.Eventually the growth of these organisms will deplete the supply of food available to them, which in turn will cause their demise
D.If continual growth is permitted, a sweet odor similar to that associated with baking will be noticed when system components are opened for inspection

2.單項(xiàng)選擇題A well-lubricated bearing surface always appears（）

A.well knurled
B.slightly streaked
C.lightly glazed
D.highly polished

3.單項(xiàng)選擇題If the plunger or barrel of a fuel injection jerk pump becomes damaged,（）

A.only the replacement of the entire pump would be acceptable
B.the injection pump and injection nozzle must be replaced
C.either the barrel or plunger must be replaced
D.the barrel and plunger must be replaced as a unit

4.單項(xiàng)選擇題In a modern internal combustion diesel engine, the load carrying part of the engine is referred to as the（）

A.bedplate or base
B.sump or oil pan
C.cylinder block
D.frame

5.單項(xiàng)選擇題Black smoke exhausting from an operating diesel engine is an indication of poor combustion which may be caused by （）

A.water in the fuel
B.insufficient fuel for combustion
C.clogged air intake passages
D.burning lubricating oil