单项选择题
A.bottom blow the boiler B.treat the water with caustic soda C.treat the water with chemical scavengers D.reduce the water alkalinity to recommended readings
Generating tubes in waste heat boilers are finned to （）...
单项选择题Generating tubes in waste heat boilers are finned to （）.
A.reduce gas flow turbulence B.prevent exhaust gas corrosion C.increase the rate of combustion D.increase the rate of heat transfer
Directional intake ports in diesel engines are used to ...
单项选择题Directional intake ports in diesel engines are used to （）.
A.reduce air charge turbulence B.induce air swirl C.deflect hot combustion gas away from the valves D.oppose the effects of piston induced squish
Mist detectors used on large low-speed main propulsion ...
单项选择题Mist detectors used on large low-speed main propulsion diesel engines monitor and check for the presence of （）.
A.fuel oil vapor at the sludge tank vent B.unburned fuel vapors in the scavenge air receiver C.lube oil vapors in the crank case D.lube oil vapors in the engine room
