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
Electrically operated safety devices on auxiliary diesel engines function to stop the engine by （）.
If the main engine of an unattended engine room shuts down automatically, it will be indicated by an alarm （）.
If a diesel engine is difficult to start and operates with the engine temperatures lower than normal, you should suspect that the （）.
The function of diesel engine piston compression rings is to （）.
An automated diesel engine should normally shut down due to （）
Lube oil cannot be efficiently filtered if its （）.
Which of the two events listed occurs simultaneously in a two-stroke/cycle diesel engine?（）
If the water level dropped rapidly in the expansion tank of a closed diesel engine cooling water system, you should suspect a （）.
White smoke exhausting from an operating diesel engine may indicate （）.
A diesel engine piston ring face is in direct contact with the （）.