单项选择题
The primary reason low pressure evaporators produce distillate more efficiently, and with less scale formation, than high pressure evaporators is （）.
A.evaporation is accomplished in a vacuum
B.due to the higher temperature of the incoming feed
C.due to the latent heat of evaporation principle
D.evaporation in a submerged medium produces more distillate
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Vessel propellers are classified as being right hand or left handA right hand propeller turns clockwise when viewed from（）.
A.the bow
B.the stem
C.the port side
D.the starboard side -
单项选择题
Less scale formation occurs in a flash evaporator than in a submerged tube evaporator because （）.
A.the distillate produced has greater purity
B.no boiling occurs on heat transfer surfaces
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D.the incoming feed is at a higher temperature -
单项选择题
A liquid sight flow indicator in a refrigeration system is examined and gas bubbles are noted in motion with the fluid flowThis means （）.
A.the system is fully charged
B.there is air leaking in from the condenser
C.ice crystals are forming in the refrigerant
D.the system contains less than a full charge of refrigerant
