單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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
C.evaporation occurs at a higher rate
D.the incoming feed is at a higher temperature