單項(xiàng)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


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1.單項(xiàng)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

2.單項(xiàng)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

3.單項(xiàng)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

5.單項(xiàng)選擇題() is the production of pure water from sea water by evaporation and re-condensing.

A.Evaporation
B.Circulation
C.Condensation
D.Distillation