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单选题
The advantages of flash type evaporators, as compared to submerged tube type evaporators, include （）.
A
less internal corrosion because of lower brine density
B
higher temperature evaporation for lower salinity of the distillate produced
C
less scale formation in a flash evaporator
D
less feed-water required for a flash evaporator
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考题
单选题The heated feed-water entering any flash chamber of a flash-type evaporator will（）A
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考题
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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考题
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In the operation of a flash type evaporator equipped with air ejectors,the air and non- condensable gases are evacuated directly from the （）.A
first stage flash chamberB
second stage flash chamberC
first stage after condenserD
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考题
单选题The demisters installed in a flash-type evaporator serve to （）A
deaerate the first effect distillateB
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考题
单选题One distinct advantage of flash type evaporators, as compared to most other evaporators, is that in a flash evaporator （）.A
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cold shocking is more effective in removing scaleD
water purity is greatly increased at high capacity
考题
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
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考题
单选题For a flash type evaporator, a demister is located the condenser（）A
AfterB
beforeC
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考题
单选题On a multistage flash-type evaporator, the flash chamber is （）A
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another term used to describe the vapor feed heater
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单选题The difference between Fixed pitch propeller (FPP) and Controllable pitch propeller (CPP) is in that（）A
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salt water feed heaterC
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考题
单选题Under normal operating conditions, the highest temperature and pressure conditions existing in a flash-type evaporator will occur in the （）.A
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second stageC
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salt water feed heater
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increase the refrigerating effect, by decreasing the amount of flash gasB
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increase the refrigerating effect by increasing the amount of flash gasD
minimize the temperature drop of the liquid as it passes through the solenoid valve to the outlet side
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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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考题
单选题A vacuum is initially created in a flash type distilling plant by（）.A
the flashing of the feed waterB
the condensation of the saltwater feedC
air ejectors, eductors, or a separate vacuum pumpD
condensation of the distillate
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