A.treating with oxygen scavengers
B.securing the boiler and giving it a blowing down
C.increasing the pH
D.reducing the phosphate level
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A.caustic embrittlement of the boiler metal
B.acidic corrosion of the boiler metal
C.hard scale deposits on the boiler tubes
D.etching of the heat exchange surfaces
A.assist in a quick cutoff of fuel injection
B.allow oil backflow from the injector to the helix
C.reduce fuel oil pressure between injection strokes
D.meter the quantity of fuel delivered
A.10
B.7
C.4
D.1
A.open air-box drains
B.loss of cooling water to the diffuser
C.gradual fouling of the air filters
D.improperly timed exhaust valves
A.concentrations of calcium sulfate in the boiler water
B.fuel oil in the feed water
C.improper treatment of the feed water with calcium sulfate
D.excessive feed water alkalinity
最新試題
Combustion knock occurring in a diesel engine can be caused by （）.
Combustion knock can occur in the cylinders of a diesel engine under any condition permitting （）.
When fuel oil has seriously contaminated a diesel engine lubricating oil, you should （）.
An automated diesel engine should normally shut down due to （）
Lube oil cannot be efficiently filtered if its （）.
Electrically operated safety devices on auxiliary diesel engines function to stop the engine by （）.
What is the function of the thrust bearing?（）
Routine monitoring of a diesel engine should include （）.
If the water level dropped rapidly in the expansion tank of a closed diesel engine cooling water system, you should suspect a （）.
What causes diesel fuel to be ignited in the cylinder of an operating diesel engine?（）