A.has little or no internal friction
B.has a lower effective compression ratio
C.operates with scavenge air under a positive pressure
D.operates without energy absorbing intake and exhaust strokes
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A.Decreased connecting rod bearing clearance
B.Increased connecting rod bearing clearance
C.Decreased compression ratio
D.Increased compression ratio
A.less fuel will enter the cylinder
B.higher the cylinder combustion temperature
C.more complete the fuel combustion
D.more rapid the rise in combustion pressure
A.dust entering the high pressure stage
B.lube oil carbonization
C.discharge pulsations
D.inter-stage vapor lock
A.increased compression ratio
B.decreased compression ratio
C.increased bearing clearance
D.decreased bearing clearance
A.The cetane number is obtained by comparing the fuel with cetane a colorless liquid hydrocarbon
B.The higher the cetane number, the shorter the ignition lag
C.The highest cetane number of fuel is 100
D.All of the above
最新試題
Which of the following items don’t belong to dock repair works?（）
The additional mark （）in the Classification Certificate for Machinery means propulsion apparatus is remotely controlled on the navigating bridge control station, and engine assembly control station is unmanned periodically.
Which one is NOT the ‘clear grounds’ for a more detailed inspection?（）
To proceed to the assistance of a ship in distress is（）
If separating effect is not good, which measure should be taken （）
Using a file without a handle may result in （）
The treatment of the fuel oils involves storage, heating, filtering and（）
When does auxiliary burner of incinerator put into operation? （）Ⅰ. start incinerator when it is coldⅡ. the sludge for dealing with is littleⅢ. the sludge for dealing with is largeⅣ. the water and impurity in sludge are too muchⅤ. the temperature in incinerator is lowⅥ. dealing with little solid rubbish
The Port State Control officer may witness a fire drill carried out by the crew assigned to these duties on the（）
（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.