In reference to air conditioning, when air attains the maximum amount of moisture it can hold at a specific temperature, it is said to be （）.

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• Sludge may form in the crankcase of an air conditioning compressor as a result of （）.

  A . bubbling refrigerant B . overheating and oxidation C . lowered operating temperatures D . reducing the cloud or flash point

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• Which of the processes listed would be the most satisfactory method to use to lower the humidity of the air being circulated by an air conditioning system?（）

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• 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

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• In extreme weather conditions, either hot or cold, control of the air conditioning plant presents （） difficulties.

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• Sludge may form in the lubricating oil crankcase of a reciprocating air conditioning compressor as a result of （）.

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• Most air conditioning units have （） for adjusting the ratio of recirculated fresh airCare must be taken not to reduce the fresh air so that stuffiness or smells arise.

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• The main distribution duct in an air conditioning system which contains the cooling coils and filters is called the（）

  A . manifold B . condenser C . chamber D . plenum

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• The quantity of cooled air delivered by an air conditioning unit should （） the sum of the quantity of air re-circulated to the unit and the quantity mechanically exhausted.

  A . balance B . not balance C . be more than D . be less tha

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• If plastic film insulation becomes damaged in air conditioning system, （） may form within the film.

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• For the proper control of the air temperature in an air conditioning system using chilled water circulation, which of the listed conditions should remain constant regardless of load changes?（）

  A . Chilled water system supply temperature B . Chilled water system return temperature C . Compressor discharge temperature D . Compressor suction pressure

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• Which of the following conditions can cause above normal air temperature to develop in the intake manifold of a four-stroke/cycle turbo-charged diesel engine?（）

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• （） is used for sensing the temperature of the room in the air condition system.

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• In an air conditioning system, moisture is removed from the air by（）

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• To add refrigerant to the high side of an air conditioning system, you should introduce the refrigerant through the （）.

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• Clean air standards referred to as “Grade D” apply to compressed air for use in（）.

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• The deterioration financial condition referred to was caused by______.

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• John had to pause from time to time to wipe the sweat off his forehead, because the air-conditioning system________（）

  A．broke in B．broke out C．broke up D．broke down

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