單項選擇題The ratio of the weight of moisture contained in a given volume of air, to the weight of moisture that the same sample would hold if saturated, is called the（）.

A.absolute humidity
B.relative humidity
C.specific humidity
D.total humidity


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1.單項選擇題If a centrifugal pump is driven by a constant speed electric motor and produces a discharge pressure less than designed, the cause is probably（）.

A.excessive pump speed
B.excessive suction head
C.worn wearing rings
D.gross pump misalignment

2.單項選擇題Which of the following statements is correct relative to distillation plant operation?（）

A.Distillation is the process of boiling seawater to produce vapor which is condensed into fresh water
B.Evaporation is the second part of the distillation process where brine is removed
C.Brine is the result of condensed sea water vapor
D.Distillate is the product resulting from the evaporation of fresh water vapor

4.單項選擇題The purpose of an air compressor unloading device is to （）

A.drain water from the air receiver
B.drain water from the cylinders
C.delay the compression process until the motor is up to speed
D.check pump alignment

5.單項選擇題Personnel working with refrigeration systems, and subject to the exposure of refrigerants should wear （）.

A.face shield
B.a respirator
C.rubber gloves
D.an all purpose gas mask