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单选题
Tube leaks in the distillate cooler of a two stage flash evaporator will result in （）.
A
loss of second stage vacuum
B
contamination of the distillate
C
lower feed inlet temperature
D
contamination of the second stage condenser
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Which of the following factors tends to increase scale formation on the saltwater side of a heat exchanger used in a diesel engine cooling water system?A.Baffle plates that have been bent during prior removalB.Leaks m the cooler tube nestC.Operating the engine while maintaining a high sea water outlet temperatureD.A punctured sea water strainer supplying cooling water to the heat exchanger
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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
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单选题One advantage of a flash distilling plant when compared to a submerged tube distiller is（）A
greater distillate purity through high temperature evaporationB
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单选题In a flash type evaporator, all saltwater headers are vented through individual vent cocks to the（）.A
saltwater heater shellB
second-stage condenserC
atmosphereD
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单选题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
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单选题In the operation of a flash type evaporator equipped with air ejectors,the air and non- condensable gases are evacuated directly from the （）.A
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second stage flash chamberC
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second stage distilling condenser
考题
单选题One distinct advantage of flash type evaporators, as compared to most other evaporators, is that in a flash evaporator （）.A
high temperature distillate can be re- circulated to induce additional flashingB
scale formation is not a severe problemC
cold shocking is more effective in removing scaleD
water purity is greatly increased at high capacity
考题
单选题Less scale formation occurs in a flash evaporator than in a submerged tube evaporator because （）.A
the distillate produced has greater purityB
no boiling occurs on heat transfer surfacesC
evaporation occurs at a higher rateD
the incoming feed is at a higher temperature
考题
单选题The advantages of flash type evaporators, as compared to submerged tube type evaporators, include （）.A
less internal corrosion because of lower brine densityB
higher temperature evaporation for lower salinity of the distillate producedC
less scale formation in a flash evaporatorD
less feed-water required for a flash evaporator
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Why will a two stage flash type distilling plant tend to operate more efficiently when operating in cold seawater?（）A
The colder seawater passing through the condenser tube bundles of the various stages increases evaporator vacuumB
The amount of heated feed water discharged from the feed water heater after cndenser is increasedC
Fewer non-condensable gases are created by the flow of colder seawaterD
More seawater is allowed to pass through the flint stage overflow weir
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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In a flash evaporator, scale as a result of higher than normal temperatures in most likely to occur in the （）A
second stage feed heaterB
saltwater feed heaterC
distillate coolerD
second stage vapor separator
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More than one stage of evaporation can take place by admitting the sea water into chambers with progressively （） pressure in the flash evaporator.A
lowerB
higherC
the lowerD
the higher
考题
单选题On which of the following heated surfaces of a flash type evaporator would you be more likely to find soft scale formation?（）A
Feed-water heater internal tube surfacesB
Internal distillate cooler tubesC
Flash chamber vertical surfacesD
Distilling condenser tubes
考题
单选题In which of the areas listed would you expect to find the highest salt concentration in a flash evaporator?（）A
Distiller air ejector cooling mediumB
Saltwater heater dischargeC
First-stage internal feed boxD
Second-stage internal feed box
考题
单选题The scavenge air receiver is of a simplified and modular design with integral non-return flaps, hanging cooler and two auxiliary air blowers（）A
dozensB
parcelsC
bundlesD
gallons
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
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单选题Puncture leaks in the lower tubes or bottom of an inflatable liferaft should FIRST be stopped by using（）.A
sealing clampsB
repair tapeC
a tube patchD
sail twine and vulcanizing kit
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单选题（）, iea steam cooler, may be filled in the boiler system to control the superheated steam temperature.A
An economizerB
An attemperatorC
A water dramD
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单选题In a shell-and-tube type hydraulic fluid cooler, the amount of heat transferred from the hydraulic fluid to the cooling water depends upon（）A
the temperature of the hydraulic fluidB
the flow rate of the hydraulic fluidC
the temperature of the cooling waterD
all of the above
考题
单选题A vacuum is initially created in a flash type distilling plant by（）.A
the flashing of the feed waterB
the condensation of the saltwater feedC
air ejectors, eductors, or a separate vacuum pumpD
condensation of the distillate
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