單項選擇題Surface irregularities, such as erosion and pitting on injection pump plungers, will（）

A.increase ignition delay
B.affect fuel oil metering
C.affect engine performance at low speed
D.only disappear due to fuel oil abrasion


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1.單項選擇題Oil oxidation, as a result of excessively high lube oil temperature, is harmful to a diesel engine because （）

A.oil foaming will occur
B.large quantities of oil are consumed
C.lube oil viscosity is always decreased
D.corrosive by-products are usually formed

2.單項選擇題When disassembling or assembling an injection pump plunger and barrel you should （）

A.keep the parts immersed in diesel fuel
B.always keep the plunger and barrel together
C.work over a linoleum-type surface
D.all of the above

3.單項選擇題In an internal combustion engine, which of the devices listed will force the compression rings to seal the compression gases in the space above the piston?（）

A.Used of bimetallic piston rings
B.Ring gap pre-tensioning
C.Thermal increase in ring-end clearance
D.Gas pressure acting against the back of the ring

4.單項選擇題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

5.單項選擇題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