单项选择题Fuel is delivered into the combustion space by ().

A.a cooling system
B.a lubricating system
C.an electric system
D.an injection system


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1.单项选择题Fuel injection valves should be taken out, cleaned, and lifting checked every ().

A.two to four months
B.four to six months
C.six to eight months

3.单项选择题Fuel injected into a diesel engines cylinder is ignited by ().

A.the heat compressed fuel/air mixture in the cylinder
B.the fuel igniter
C.the fuel injector
D.the fuel pump

4.单项选择题Fuel has been injected but ignition fails The possible cause may be ().

A.leaky exhaust valve
B.increased scavenging air temperature
C.engine cylinders not scavenged sufficiently
D.water in the fuel oil

5.单项选择题Fresh water is used for the cooling of cylinder jackets and () of the marine diesel engine.

A.cylinder covers
B.lubricating space
C.crosshead
D.exhaust manifold

6.单项选择题Four strokes consist of suction, compression, () and exhaust stroke.

A.combustion
B.condensation
C.charging
D.evaporation

7.单项选择题For one or two types of engine,the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through ().

A.the cylinder cover
B.the bottom of bed-plate
C.the sump
D.the crankcase door

8.单项选择题For one or two types of engine, the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through the ().

A.cylinder casing
B.cylinder bore
C.crankcase door
D.aperture in the cylinder block

9.单项选择题For an ordinary modem marine four-stroke engine the inlet valves close ().

A.after TDC
B.before TDC
C.after BDC
D.before BDC

10.单项选择题For an ordinary four-stroke engine the inlet valves open ()

A.after TDC
B.before TDC
C.after BDC
D.before BDC