单选题Which of the listed conditions will cause the feed water that has not flashed to vapor in the first-stage of a flash evaporator, to flow into the second-stage?（）AGravity siphon effectBHigher vacuum in the second-stageCDifference in brine density between first and second stagesDlower pressure in first-stage
单选题
Which of the listed conditions will cause the feed water that has not flashed to vapor in the first-stage of a flash evaporator, to flow into the second-stage?（）
A
Gravity siphon effect
B
Higher vacuum in the second-stage
C
Difference in brine density between first and second stages
D
lower pressure in first-stage
参考解析
解析：
暂无解析
相关考题：
Of all the extingushing agents listed below, which one has the greatest capacity for heat absorption?______.A.Water fogB.Carbon dioxideC.Dry chemicalD.Solid stream of water
Which of the conditions listed will cause a refrigeration compressor to run constantly without simultaneously decreasing the temperature in the refrigerated space?( )A.Shortage of refrigerant oilB.Slight shortage of refrigerantC.Excessive condenser cooling water flowD.Faulty expansion valve
Which of the listed conditions can be considered as the single greatest cause of accidents?A.SpeedB.Excessive knowledge or skillC.Human errorD.Excitement
If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler, the cause may be ______.A.high steam pressure in the boilerB.abnormally high feed-water temperatureC.abnormally high boiler water temperatureD.steam demand exceeding feed pump capacity
单选题The most common cause of scale formation in an auxiliary boiler is （）Aconcentrations of calcium sulfate in the boiler waterBfuel oil in the feed waterCimproper treatment of the feed water with calcium sulfateDexcessive feed water alkalinity
单选题Which of the conditions listed will cause a refrigeration compressor to run constantly without simultaneously decreasing the temperature in the refrigerated space?（）AShortage of refrigerant oilBSlight shortage of refrigerantCExcessive condenser cooling water flowDFaulty expansion valve
单选题The heated feed-water entering any flash chamber of a flash-type evaporator will（）Avaporize, with the un-flashed water remaining at the temperature at which it entered the flash chamberBvaporize, with the un-flashed eater equalizing to the saturation conditions existing in the f lash chamberCvaporize, with the remaining water a t a temperature greater than it entered the flash chamberDboil, allowing steam bubbles to rise through the brine at the bottom of the flash chamber
单选题Which of the listed chemicals can be routinely used to maintain the hygienic quality of potable water?（）AHydrochloric acidBChlorineCSulfuric acidDZinc chromate
单选题Which of the listed conditions can cause a diesel engine to use too much lube oil?（）ADirty lube oil filterBToo much piston ring wearCHigh lube oil viscosityDLow lube oil temperature
单选题Which of the diesel engine cylinder liners listed has internal cooling water passages?（）AInternally finned linerBExternally finned linerCWet linerDIntegral water-jacket liner
单选题The three conditions which cause engine shutdown are overspeed，low lube oil pressure，and（）.AHigh lube oil pressureBHigh jacket water pressureCHigh jacket water temperatureDLow jacket water pressure
单选题Which of the conditions listed may occur in an operating diesel engine if air pockets form within the cylinder head circulating water passages? （）AHydraulic stress and distortion will developBHot spots will developCFuel oil viscosity will increasedDAn increase in trapped deposits of scale and dirt
单选题For the proper control of the air temperature in an air conditioning system using chilled water circulation, which of the listed conditions should remain constant regardless of load changes?（）AChilled water system supply temperatureBChilled water system return temperatureCCompressor discharge temperatureDCompressor suction pressure
单选题Which of the listed conditions will occur if a diesel engine exhaust valve is leaking?（）ALoss of compression for that cylinderBMisfiring or rough runningCDamage to the valveDAll of the above
单选题Which of the listed cylinder liner surface conditions indicates proper lubrication?（）ADull black appearanceBBright appearanceCThin layer of lacquerDThick oily film
单选题Which of the listed conditions can cause lacquer to be deposited on a piston skirt?（）AHigh sulphur content fuelBHigh lube oil temperaturesCHigh vanadium content fuelDExcessive piston slap
单选题Which of the listed conditions can be considered as the single greatest cause of accidents?（）ASpeedBExcessive knowledge or skillCHuman errorDExcitement
单选题The second stage feed-water temperature and shell absolute pressure in a multistage, flash type, distilling plant is （）Ahigher than the first stage feed-water temperature and absolute shell pressureBlower than the first stage feed-water temperature and absolute shell pressureCthe same as the first stage feed-water temperature and absolute shell pressureDnot related to the feed-water temperature and absolute shell pressure
单选题Which of the listed conditions will cause the feed water that has not flashed to vapor in the first-stage of a flash evaporator, to flow into the second-stage?（）AGravity siphon effectBHigher vacuum in the second-stageCDifference in brine density between first and second stagesDlower pressure in first-stage
单选题In which of the areas listed would you expect to find the highest salt concentration in a flash evaporator?（）ADistiller air ejector cooling mediumBSaltwater heater dischargeCFirst-stage internal feed boxDSecond-stage internal feed box
单选题For proper operation, auxiliary boiler feed water must have which of the following characteristics?（）AHigh oxygen concentrationBLow pHCProper alkalinityDAll of the above
单选题Under normal operating conditions, the highest temperature and pressure conditions existing in a flash-type evaporator will occur in the （）.Afirst stageBsecond stageCdistillate coolerDsalt water feed heater
单选题Which of the following conditions can cause below normal air pressure in the intake manifold of a turbocharged diesel engine?（）AExcessive piston blow-by to the manifoldBInsufficient cooling water flowCAccumulated water in the air boxesDClogged air intake filters
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Which of the following conditions could cause the feed pump for an auxiliary boiler to lose suction?（）AIncreased suction head pressureBDecreased feedwater temperatureCPump recirculating line being open too muchDExcessive feedwater temperature
单选题If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler, the cause maybe （）.Ahigh steam pressure in the boilerBabnormally high feed water temperatureCabnormally high boiler water temperatureDsteam demand exceeding feed pump capacity
单选题Which of the listed conditions will affective pressure the most in the cylinder of a diesel engine?（）ATBN of the lubricating oilBTemperature of the lube oilCCompleteness in the mixing of the fuel and airDTemperature of the cooling (sea) water
单选题Which of the listed failures, occurring in an automated diesel generator system, should cause an audible alarm at the engine room control station?（）ALow cooling water outlet temperatureBHigh lube oil pressureCLow lube oil temperatureDLow starting air pressure