问题：
[单选] The replacement piping for diesel engine high pressure fuel systems must be the same length and diameter as the original piping to （）.
avoid unnecessary pints inventory。keep torsional vibration constant。use existing supports and braces。maintain specified injection characteristic。
问题：
[单选] Diesel engine jacket water is used in the distillation process as the （）.
coolant for the distillate。coolant for the brine cooler。means of heating the feedwater。primary means of producing a vacuum within the distiller。
问题：
[单选] When the prime movers of two paralleled generators are equipped with mechanical- hydraulic governors, and are operating within their designed range, the unit with the least amount of speed droop will （）.
pick up more of any increase in load。pick up less of any increase in load。share an equal amount of any increase in load。drop an equal amount of any decrease in load。
问题：
[单选] Clearance volume scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished （）.
during the valve overlap period。with only the exhaust valve open。at a pressure below atmospheric。without cooling the cylinders or pisto。
问题：
[单选] Mist detectors used on large low-speed main propulsion diesel engines monitor and check for the presence of （）.
fuel oil vapor at the sludge tank vent。unburned fuel vapors in the scavenge air receiver。lube oil vapors in the crank case。lube oil vapors in the engine room。
问题：
[单选] Directional intake ports in diesel engines are used to （）.
reduce air charge turbulence。induce air swirl。deflect hot combustion gas away from the valves。oppose the effects of piston induced squish。
问题：
[单选] Generating tubes in waste heat boilers are finned to （）.
reduce gas flow turbulence。prevent exhaust gas corrosion。increase the rate of combustion。increase the rate of heat transfer。
问题：
[单选] Diesel engine main and connecting rod precision bearings are made in halvesEach half exceeds one-half the bearing circumference by a small amountThe small amount is termed （）.
clearance。crush。pitch。thrust。
问题：
[单选] Fuel is admitted to a diesel engine cylinder through the （）.
intake valves。carburetor。exhaust ports。injector nozzle。
问题：
[单选] Telescopic pipes to the piston of a large slow-speed main propulsion diesel engine are designed to prevent （）.
excessive crankcase pressure。excessive lube oil temperature。contamination of the lube oil by water。contamination of the cooling water by lube oil。
