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单选题
In a flash evaporator, scale as a result of higher than normal temperatures in most likely to occur in the （）
A
second stage feed heater
B
saltwater feed heater
C
distillate cooler
D
second stage vapor separator
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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The heated feed-water entering any flash chamber of a flash-type evaporator will（）A
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单选题The scale trap is located between the （）A
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单选题For a flash type evaporator, the seawater heater will have to maintain a enough temperature to minimize scale formation（）A
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单选题Less scale formation occurs in a flash evaporator than in a submerged tube evaporator because （）.A
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单选题The heated feedwater entering any flash chamber of a flash-type evaporator will（）A
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单选题In a flash evaporator, scale as a result of higher than normal temperatures in most likely to occur in the （）A
second stage feed heaterB
saltwater feed heaterC
distillate coolerD
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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
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单选题The primary reason low pressure evaporators produce distillate more efficiently, and with less scale formation, than high pressure evaporators is （）.A
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