單項選擇題

If the refrigeration compressor crankcase is sweating, the cause may be due to （）.

A.a shortage of refrigerant
B.the compressor running continuously
C.liquid refrigerant returning to the compressor
D.the compressor short cycling on the high pressure cutout

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單項選擇題

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

單項選擇題

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