單項選擇題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 off
B.flash evaporation
C.condensation
D.none of the above


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1.單項選擇題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 needed
B.to prevent an excess amount of cooling water from being discharged to the bilges
C.to supply hot water to the evaporator for more economical operation
D.None of the above is tree

2.單項選擇題When distilling sea water the cooling water discharging from the distiller is fed back to evaporator as feed water （）.

A.to decrease scale formation
B.for better cooling effect
C.for more economical purpose
D.to raise vacuum

3.單項選擇題In a vacuum boiling evaporator, the fresh water generated is pumped out by （）.

A.a brine pump
B.an air ejector
C.a feed water pump
D.a condensate pump

4.單項選擇題With a vacuum boiling evaporator, the remainder of sea water fed to the evaporator is pumped out by （）.

A.a brine pump
B.an air ejector
C.a feed pump
D.distillate pump