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
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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
A.High oxygen concentration
B.Low pH
C.Proper alkalinity
D.All of the above
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Maximum horsepower of a diesel engine is attained （）.
When fuel oil has seriously contaminated a diesel engine lubricating oil, you should （）.
The function of diesel engine piston compression rings is to （）.
If a diesel engine is difficult to start and operates with the engine temperatures lower than normal, you should suspect that the （）.
What causes diesel fuel to be ignited in the cylinder of an operating diesel engine?（）
Combustion knock can occur in the cylinders of a diesel engine under any condition permitting （）.
Proper filtering and straining of fuel oil is important because the （）.
Diesel engine control can be obtained by the bridge （）.
A diesel engine is operating with excessively high exhaust temperatures at all cylindersTo correct this condition, you should FIRST （）.
White smoke exhausting from an operating diesel engine may indicate （）.