单选题When the boiler load returns to normal, the drum pressure will rise and steam bubble formation will reduce, causing a fall in water level This is known as （）.AswellBshrinkageCflash offDlack of water
单选题
When the boiler load returns to normal, the drum pressure will rise and steam bubble formation will reduce, causing a fall in water level This is known as （）.
A
swell
B
shrinkage
C
flash off
D
lack of water
参考解析
解析：
暂无解析
相关考题：
The correct procedure for giving an auxiliary boiler a bottom blow, is to begin .A.when the boiler has been secured long enough for most solids to settleB.when the boiler has been cooled to ambient temperatureC.only after raising the water level to within 0.5 inch of the high water cutout onlyD.after bypassing the low pressure
The water level showing in a boiler water gauge glass is usually ( ) duringworking.A.higher than the actual drum water levelB.equal to the actual drum water levelC.increasing due to steam condensation in the glassD.lower than actual drum wafer level
When using a fuel with a higher than normal sulfur content in an auxiliary four stroke diesel engine, you mayA.maintain higher than normal jacket water temperatureB.change the lube oil more frequently than normalC.maintain a higher air-box temperature than normalD.maintain a higher air-box pressure than normal
Which statement about the inert gas system is TRUE ________．A.Boiler soot blowers should never be used when the IG system is operatingB.The boiler will produce the best quality of flue gas for the IG system when the boiler load is very lightC.The boiler will produce the most quantity of flue gas for the IG system when the boiler load is very lightD.Flue gas with excessive oxygen content is de-oxygenated in the scrubber
单选题Overheating of a hydraulic system may be a result of （）.Achanging pump discharge pressure in response to normal load variationsBa high oil levelCincorrect fluid viscosityDcontinued slow re-circulation of the oil
单选题To avoid excessive surge pressure when bunkering, you should （）Abunker at a normal rateBcheck for kinks in hoseCclose valves slowlyDshut valves before topping off
单选题You should frequently compare drum-mounted and remote-reading water level indicators（） between these have contributed to failures because of overheating through shortage of water, when a boiler was being oil-fired.AdescriptionsBdiscrepanciesCdifferentDdeflections
单选题Late fuel injection timing is indicated by （）Alower than normal cylinder pressure and low exhaust temperatureBlower than normal cylinder pressure and high exhaust temperatureChigher than normal cylinder pressure and low exhaust temperatureDhigher than normal cylinder pressure and high exhaust temperature
单选题What is NOT a function of the steam drum of a marine water-tube boiler（）.AReceives saturated steam from the generating tubesBServes as a reservoir of boiler feed waterCHolds internal fittings for separation of moisture from steamDCollects steam exhausted from the turbines
单选题When a sudden increase in steam demand occurs from the boiler, the water level in the drum at the higher pressure will（）Arise quicklyBrise slowlyCdrop quicklyDdrop slowly
单选题The purpose of the safety relief valves installed on an auxiliary boiler is to （）.Arelieve excess fuel oil pressure during the “off” fire cycleBadmit water to the dry pipeCthrottle the forced draft fan output for proper combustionDreduce excess steam pressure in the boiler
单选题The diesel engine exhaust gas bypass, as fitted with some waste heat boilers, is installed to （）Aprevent engine back pressure at heavy loadsBincrease total engine efficiency at low loadsCprevent boiler corrosion at low engine loadsDimprove engine fuel consumption at any load
单选题When ship is fouled, increasing the fuel injection for keeping the normal speed will cause the main engine （）Ato work as overload characteristicBoverspeedCover mechanical load onlyDover thermal load only
单选题When a sudden increase in steam demand comes to normal, the drum pressure will and water level in the drum will（）.Arise, rise alsoBrise, dropCdrop, riseDdrop, drop also
单选题When a diesel engine is operate at partial load, as compared to full load ,a decrease will occur in the average （）Aair quantity aspiratedBfuel injection pressureCcombustion pressure on the power strokeDcompression on the compression stroke
单选题When normal operating pressure is applied to the hydraulic oil used in a high-pressure system, the oil （）.Aviscosity will decreaseBvolume will increaseCvolume will decreaseDpour point will be reduced
单选题Which one is not the normal operation for boiler shutdown?（）ACarry out soot blowing if permissibleBChange fuel supply to diesel oilCClose steam stop valves on boiler when pressure is reducedDDrain boiler empty when it has cooled down
单选题Large, two-stroke/cycle, main propulsion, diesel engine cylinders can be successfully pressure charged during normal operation, by using the （）.Aexhaust gas temperature systemBexhaust load systemCconstant or pulse pressure systemDconstant volume system
单选题The boiler feed pump discharge pressure is higher than the steam drum pressure to （）.Aensure feed water flow into the boilerBkeep the steam drum pressure highCprevent water hammer in the feed lineDhelp the feed water flash to steam
单选题The water level in a steaming auxiliary boiler will always （）Arise when the steam pressure is increasedBremain constant as long as the feed pump operatesCfall when the steam pressure is decreasedDvary as the steam demand changes
单选题The water level showing in a boiler water gauge glass is usually （） during working.Ahigher than the actual drum water levelBequal to the actual drum water levelCincreasing due to steam condensation in the glassDlower than actual drum water level
单选题Which of the following statements is correct regarding a turbocharged four-stroke/cycle diesel generator?（）AAt zero load the intake manifold pressure is greater than the exhaust manifold pressureBAt full load the intake manifold pressure and exhaust manifold pressure are equalCAt full load the intake manifold pressure is less than the exhaust manifold pressureDAt full load the intake manifold pressure is greater than the exhaust manifold pressure
单选题Foaming in the steam drum may be caused by （） in a boiler.Aoxygen in the waterBpoor boiler designCdensity too highDexcessive steam demand
单选题Bottom blow valves are installed on auxiliary water-tube boilers to （）Acompletely drain the boiler in an emergencyBprevent sludge from forming in the drumCremove floating impurities from the boiler water surfaceDremove settled solids from the water drum
单选题When attempting to restart a warm high-speed engine, which of the following reactions can you expect?（）AExcessive fuelBHigher than normal temperatures for star upCLonger starting periodsDHigher than normal lube oil pressure
单选题When using a fuel with a higher than normal sulfur content in an auxiliary diesel engine, you should（）Amaintain higher than normal jacket water temperatureBchange the lube oil more frequently than normalCmaintain a higher air-box temperature than normalDmaintain a higher air-box pressure than normal
单选题The single acting cylinder is the simplest form where pressure is applied to the full area of the piston head to move the load through piston rod extensionThe load causes rod （） when the drive pressure is released.AcontractionBretractionCexpansionDshrinkage