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单选题
The demisters installed in a flash-type evaporator serve to （）
A
deaerate the first effect distillate
B
filter the condensed flash vapors
C
deaerate the first and second effect distillate
D
remove small water droplets entrained in the flashed vapor
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考题
The condensers located in various stages of a flash evaporator are cooled by( ).A.distillateB.seawaterC.brineD.air
考题
Which of the listed problems could produce a high absolute pressure within a flash type evaporator?A.production of high salinity distillateB.seawater feed temperature below 165℃C.a leak in the first stage demisterD.a cracked distillate pump vent line
考题
单选题Condensate formed within the first-effect tube nest of a double-effect,low pressure evaporator, is removed by a （）.A
series of bafflesB
crossover pipeC
condensate separatorD
drain pump
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单选题A heated bulkhead has the effect on a hygroscopic commodity of（）.A
causing moisture to accumulate against bulkheadB
lowering the vapor pressure of the commodityC
lowering the dew point of the airD
raising the vapor pressure of the commodity
考题
单选题The vacuum maintained in the salt water feed heater shell of a flash-type evaporator is generally accomplished by （）.A
a separate air ejector unitB
a direct unimpeded connection between second stage and salt water feed heaterC
either by vacuum drag or an external line from the first stage via a fixed orificeD
the fixed orifice provided in the steam supply line
考题
单选题Under normal operating conditions, the highest temperature and pressure conditions existing in a flash-type evaporator will occur in the （）.A
first stageB
second stageC
distillate coolerD
salt water feed heater
考题
单选题A flash-type evaporator discharges heated seawater into a chamber that is maintained at a pressure than the vapor pressure of the entering heated seawater, and subsequently the flashed water vapor thereby produced（）A
lower condensingB
higher coolingC
lower coolingD
higher condensing
考题
单选题Small droplets of water entrained in the flashed vapor produced in a flash-type evaporator, are removed by the （）A
spray pipesB
demistersC
condensersD
splash baffles
考题
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 effectB
Higher vacuum in the second-stageC
Difference in brine density between first and second stagesD
lower pressure in first-stage
考题
单选题In the two stage flash distilling plant, which of the pumps listed is vented to the shell of the second stage in order to remove vapor from the pump suction?（）A
Condenser circulating water pumpB
Feed-water heater drain pumpC
Distillate pumpD
Air ejector condenser drain pump
考题
单选题On a multistage flash-type evaporator, the flash chamber is （）A
combined as part of the salt water feed heaterB
the open area above the brine levels in the first and second stagesC
combined as part of the distillate coolerD
another term used to describe the vapor feed heater
考题
单选题The second stage feed-water temperature and shell absolute pressure in a multistage, flash type, distilling plant is （）A
higher than the first stage feed-water temperature and absolute shell pressureB
lower than the first stage feed-water temperature and absolute shell pressureC
the same as the first stage feed-water temperature and absolute shell pressureD
not related to the feed-water temperature and absolute shell pressure
考题
单选题Which of the following descriptions best identifies the operating principal of a flash-type evaporator?（）A
Sea water is heated to boiling temperature while under a vacuumB
Sea water is passed over heated plates in a thin filmC
Heated sea water is injected into a vacuum chamberD
Sea water is forced through a heated eductor
考题
单选题In a flash distilling unit, evaporator feed (seawater) first absorbs heat in the （）.A
vapor feed heaterB
air ejector condenserC
saltwater heaterD
distillate cooler
考题
单选题The demisters installed in a flash-type evaporator serve to （）A
deaerate the first effect distillateB
filter the condensed flash vaporsC
deaerate the first and second effect distillateD
remove small water droplets entrained in the flashed vapor
考题
单选题Condensate must be drained from the intercooler and after-coolers of an air compressor because （）.A
the cooling effect of the condensate reduces the compressors efficiencyB
a danger of explosion exists whenever water is present in a compressorC
water causes erratic operation of pneumatic componentsD
the volumetric capacity of the first stage is reduced if water remains
考题
单选题The first treatment given to a person overcome by benzene vapor should be to（）.A
remove them to fresh airB
flush their face with water for about 5 minutesC
stand them up and walk them aroundD
remove their clothing and wrap them in blankets
考题
单选题What is the harmful effect of sulfur in a fuel?（）A
It causes excessive smoking and soot at low firing ratesB
It doesn’t readily burn when combined with oxygenC
It clogs fuel oil strainers more oftenD
It forms a corrosive acid when mixed with water or water vapor
考题
单选题The heated feedwater entering any flash chamber of a flash-type evaporator will（）A
vaporize, with the unflashed water remaining at the temperature at which it entered the flash chamberB
vaporize, with the unflashed water equalizing to the saturation conditions existing in the flash chamberC
vaporize, with the remaining water at the temperature greater than it entered the flash chamberD
boil, allowing steam bubbles to rise through the brine at the bottom of the flash chamber
考题
单选题If the capacity of the refrigeration compressor is too small, the excess vapor will accumulate in the evaporator, causing the pressure to （）.A
riseB
fallC
be maintained constantD
None of the above is true
考题
单选题Which of the following statements is correct relative to distillation plant operation?（）A
Distillation is the process of boiling seawater to produce vapor which is condensed into fresh waterB
Evaporation is the second part of the distillation process where brine is removedC
Brine is the result of condensed sea water vaporD
Distillate is the product resulting from the evaporation of fresh water vapor
考题
单选题The heated feed-water entering any flash chamber of a flash-type evaporator will（）A
vaporize, with the un-flashed water remaining at the temperature at which it entered the flash chamberB
vaporize, with the un-flashed eater equalizing to the saturation conditions existing in the f lash chamberC
vaporize, with the remaining water a t a temperature greater than it entered the flash chamberD
boil, allowing steam bubbles to rise through the brine at the bottom of the flash chamber
考题
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