单项选择题The rising of the exhaust temperature in manifold pipe may NOT result from ().

A.too great a loading
B.fouled turbocharger
C.bad combustion
D.excessive air


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1.单项选择题The rim of the piston may contain cut-out portions to accommodate () when they open.

A.the gases
B.the air
C.the valves
D.the injectors

2.单项选择题The removal of () from lubricating oil will reduce engine wear and possible breakdowns.

A.contaminating water
B.contaminated additives
C.contaminated fuel
D.contaminating impurities

3.单项选择题The remaining oil in the lubricating pipes and ducts should be blown out with ().

A.atmosphere
B.the fresh water
C.compressed air
D.chemical compounds

4.单项选择题The quantity of oil injected into the cylinder can be regulated ().

A.by turning the pump plunger
B.by vary the fuel valve spring force
C.by no means by controlling the governor
D.by enlarging or diminishing the injection hole

5.单项选择题The purpose of the flywheel of a diesel engine is to ().

A.counterbalance the crank throws on the crankshaft
B.keep the engine running smoothly between power stroke
C.provide a belt-driving surface for the operation of auxiliary machinery
D.prevent the engine from overspeeding

7.单项选择题The pumps employed on board ship can be divided into two main categories ie() pumps and centrifugal pumps.

A.gear
B.nonpositive displacement
C.positive displacement
D.rotary

10.单项选择题The process to remove exhaust gases by blowing in fresh air is called ().

A.charging
B.supercharging
C.starting
D.scavenging