單項選擇題Which of the following methods is normally used to control the temperature of air distributed from individual cooling coils in an air conditioning system using a chilled water circulation system?（）

A.A room thermostat activates an electric heater at each individual chilled air outlet when necessary
B.Varying the number of passes the air makes across the coils
C.Varying the temperature of the water through the coils
D.Varying the quantity of water flowing through the coils


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1.單項選擇題As the amount of moisture in the air increases, the difference between the dry bulb and wet bulb temperature will （）.

A.increase
B.decrease
C.remain unchanged
D.be greatest at dew point

2.單項選擇題Routine maintenance on a Central Control Room hermetically sealed air conditioning unit should include （）

A.changing the air filter
B.recharging the system
C.changing compressor lubricant
D.renewing container vacuum

3.單項選擇題In an air conditioning system, moisture is removed from the air by（）

A.filers
B.separators
C.ducted traps
D.dehumidifiers

4.單項選擇題A lower thermostatic temperature setting will provide a desired degree of comfort in a room where （）

A.low relative humidity is maintained
B.triple banded squirrel cage fans are used
C.air circulation is a maximum
D.high relative humidity is maintained

5.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