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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 chamber
B
vaporize, with the unflashed water equalizing to the saturation conditions existing in the flash chamber
C
vaporize, with the remaining water at the temperature greater than it entered the flash chamber
D
boil, allowing steam bubbles to rise through the brine at the bottom of the flash chamber
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更多 “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” 相关考题
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The process during which liquid containing a reasonable amount of sensible heat at a particular pressure immediately changes into steam after admitted to a chamber at a lower pressure is called _____.A.boiling offB.flash evaporationC.condensationD.none of the above
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单选题The flash-evaporator is different with the submerged-tube evaporator in that for the former（）A
Water is heated into vapor on heating surfacesB
Water is vaporized by pressure differenceC
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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
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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
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
单选题In a flash type evaporator, all saltwater headers are vented through individual vent cocks to the（）.A
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单选题Improper maintenance of an automatic auxiliary boiler oil burner could result in （）.A
fuel pump failureB
fan motor failureC
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考题
单选题What is the operating principal of a flash type evaporator?（）A
Sea water is heated to boiling temperature under a vacuumB
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考题
单选题The design of for a flash type evaporator is of critical importance because it must provide an optimum feedwater spray pattern that facilitates the flashing process, and it must also maintain a pressure differential between successive stages（）A
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flashing deviceC
lashing deviceD
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考题
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单选题Which of the following descriptions best identifies the operating principal of a flash-type evaporator?（）A
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考题
单选题Early models of the flash-type evaporators used a separate shell-and-tube heat exchanger as the air ejector condenser.More recent models use a combined air ejector condenser with the（）A
distilling condenserB
salt water feed heaterC
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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
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考题
单选题The three basic parts of any eductor are the nozzle, the suction chamber, and the （）.A
injectorB
compressorC
diffuserD
siphon
考题
单选题The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated （）A
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for centrifugingC
in a storage tankD
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考题
单选题The principal purpose of sub-cooling liquid refrigerant prior to its entering the expansion valve is to （）.A
increase the refrigerating effect, by decreasing the amount of flash gasB
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考题
单选题Which of the following conditions could cause the feed pump for an auxiliary boiler to lose suction?（）A
Increased suction head pressureB
Decreased feedwater temperatureC
Pump recirculating line being open too muchD
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考题
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can kill those entering others’ houses by forceB
will threaten the safety of the owners as wellC
will frighten away any possible intrudersD
can show the special status of its owners
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