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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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单选题When a flash-type evaporator is to be secured for an extended period of time, the entire unit should be drained, cleaned, and （）.A
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filled with de-scaling compoundC
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vented to the atmosphere
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单选题The flash-evaporator is different with the submerged-tube evaporator in that for the former（）A
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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
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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
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vaporize, with the remaining water a t a temperature greater than it entered the flash chamberD
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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
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单选题The bulb for the thermal expansion valve is located（）A
in the middle of evaporator coilsB
near the evaporator coil outletC
near the evaporator coil inletD
on the bottom row of evaporator coils
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When distilling salt water the cooling water discharging from the distiller is fed back to evaporator as feed water （）.A
to cut down the amount of cooling water neededB
to prevent an excess amount of cooling water from being discharged to the bilgesC
to supply hot water to the evaporator for more economical operationD
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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
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单选题For a flash type evaporator, a demister is located the condenser（）A
AfterB
beforeC
insideD
outside
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
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suction side of a bilge pumpB
exhaust manifold of an auxiliary dieselC
discharge line from an air compressorD
chemical feed tank of an evaporator
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a brine pumpB
an air ejectorC
a feed pumpD
distillate pump
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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
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Sea water is forced through a heated eductor
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单选题The refrigerating agent can （） at low temperature in the evaporator.A
expandB
evaporateC
condenseD
distil
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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In practice, the refrigerant flow after the evaporator is designed to ensure that the vapor leaving the evaporator is slightly （）.A
saturatedB
super-cooledC
wetD
superheated
考题
单选题The thermal expansion valve responds to the（）A
amount of superheat in the vapor leaving the coilB
amount of superheat in the liquidC
temperature in the evaporator coilsD
pressure in the evaporator coils
考题
单选题Two TV cameras _____ eyes of a mechanical man.A
are served asB
serve asC
will be serve asD
were serve as
考题
问答题SERVE（服务）
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