單項選擇題To prevent the unnecessary loading of an air conditioning system while maintaining the designed dry bulb temperature and relative humidity in an air conditioning system, you should （）

A.admit only enough fresh outside air to provide proper ventilation
B.reduce the air reheating system load
C.lower the compressor head pressure
D.operate the purge recovery unit continuously


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1.單項選擇題To add refrigerant to the low side of an air conditioning system, the refrigerant should be introduced through the （）

A.suction service valve as a vapor
B.suction service valve as a liquid
C.discharge service valve as a vapor
D.charging valve as a liquid

2.單項選擇題Which of the fluids listed is normally used to condense the primary refrigerant in a shipboard central air conditioning system?（）

A.Air or Nitrogen
B.Seawater or Fresh water
C.Sodium Nitrate brine
D.Calcium Sulfate brine

3.單項選擇題

The effective temperature of air is dependent upon（）
Ⅰ.relative humidity
Ⅱ.air velocity

A.Ⅰonly
B.Ⅱonly
C.Both Ⅰand Ⅱ
D.NeitherⅠnor Ⅱ

4.單項選擇題When air is at its dew point it is at its（）

A.lowest absolute humidity
B.lowest relative humidity
C.highest absolute humidity
D.highest relative humidity

5.單項選擇題The latent heat of water vapor in air is dependent upon the （）

A.dry bulb temperature
B.wet bulb temperature
C.dew point
D.dry point