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单选题
Brine density in a distilling plant is measured with a/an （）.
A
psychrometer
B
salinometer
C
anemometer
D
sphygmomanometer
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reduced evaporator capacityC
low brine concentrationD
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单选题The process of boiling seawater in order to separate it into freshwater vapor and brine is usually defined as （）.A
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condensationC
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Increasing the absolute pressure of the shell will increase the distillers capacityC
Mesh separators are used in evaporators to filter the distillateD
Reducing the brine density will reduce the heat lost overboard
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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
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Feed-water heater drain pumpC
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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
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单选题In a flash distilling unit, evaporator feed (seawater) first absorbs heat in the （）.A
vapor feed heaterB
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单选题When is the density of the water required to be logged in the logbook of a ship?（）A
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Prior to getting underway when the vessel is floating in fresh or brackish waterC
Only when the vessel moves from fresh water into salt waterD
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考题
单选题The efficiency and output capacity of a low pressure distilling plant will be reduced if the last effect shell （）A
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单选题A vacuum is initially created in a flash type distilling plant by（）.A
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the condensation of the saltwater feedC
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单选题One of the causes of ocean currents is density differences in the water. This is true because （）.A
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Distillation is the process of boiling seawater to produce vapor which is condensed into fresh waterB
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