Some refrigeration systems have chemical moisture indicators installed in conjunction with the sight glass in the liquid lineIf excess moisture is present in the system, the indicator will （）

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• Sweating of the refrigeration system compressor crankcase is caused by （）.

  A . too much superheat B . insufficient superheat C . suction pressure too low D . excessive refrigerant returning to the compressor

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• The receiver used in a refrigeration system（）

  A . stores liquid refrigerant B . collects non-condensable gases C . allows refrigerant sub-cooling D . prevents compressor surging

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• In the refrigeration system, a shortage of refrigerant is indicated by （）.

  A . the compressor short cycling on high pressure cut out switch B . high suction pressure C . high head pressure D . bubbles in the sight gla

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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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• Which of the listed statements is correct concerning refrigeration systems?（）

  A . Dehydrators must be used continuously in a refrigeration system B . A 25 ton refrigeration system has the same cooling effect as melting 25 tons of ice in 24 hours C . A thermostatic expansion valve is used to control refrigerated space temperature D . The liquid receiver functions to collect and remove non- condensable gase

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• In a refrigeration system, the refrigerant absorbs the latent heat of vaporization in the（）.

  A . compressor B . condenser C . receiver D . evaporator

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• 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

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• The refrigeration system low pressure cutout switch is actuated by （）.

  A . an electric system manager B . a sensing bulb at the tail coil of the evaporator C . pressure changes in the suction line D . failure of the king solenoid valve

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• Crankcase sweating in a refrigeration system is caused by （）.

  A . a stuck solenoid valve B . a shortage of refrigerant C . too much oil in circulation D . too much superheat

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• Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?（）

  A . Sub-cooled liquid B . Sub-cooled vapor C . Superheated vapor D . Liquid

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• The refrigerator is（）we must buy some food.

  A . bare B . blank C . hollow D . empty

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• Zinc rods are installed in the refrigeration system （）.

  A . liquid strainer B . liquid receiver C . saltwater condenser D . evaporator

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• The presence of bubbles in a refrigeration system liquid line may （）.

  A . promote refrigerant dehydration B . be absorbed in the receiver C . cause low condensing pressure D . carry moisture and lead to corrosio

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• Which of the listed refrigeration system components keeps the refrigerant circulating through the system?（）

  A . Expansion valve B . Condenser C . Evaporator D . Compressor

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• The component of a refrigerating system in which the refrigerant vaporizes and absorbs heat is known as the （）.

  A . condenser B . vapor generator C . accumulator D . evaporator

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• Refrigeration system compressor crankcase sweating is an indication of （）.

  A . insufficient lube oil circulating through the system B . excessive circulation of lube oil through the system C . insufficient refrigerant in the system D . an overworked compressor

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• In which of the listed refrigeration system components does superheating of the refrigerant take place?（）

  A . Expansion valve B . Evaporator C . Drier D . Receiver

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

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

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• Moisture is removed from a refrigeration system by（）.

  A . bleeding refrigerant from the condenser B . opening a drain petcock on the oil separator C . condensing the water in the heat exchanger D . using a dehydrator cartridge

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• In an operating refrigeration system low on refrigerant, a liquid line sight glass will（）

  A . be clear B . be blue C . be light green D . show bubble

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• Air entering an air-cooled refrigeration system is indicated by （）.

  A . frosting of the liquid line B . higher than normal head pressure C . a clear sight glass D . abnormally cold reefer boxe

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• The function of （） in a refrigeration plant using Freon is to move moisture from all refrigeration system.

  A . filter B . filter drier C . heat exchanger D . air cooler

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• Some chloronated flourocarbon refrigerants may decompose into a toxic irritating gas if it is （）.

  A . stored at temperatures below 60 degrees Fahrenheit B . charged into a system having copper fittings C . allowed to mix with compressor oil D . exposed to an open flame or hot surface

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• Excessive circulation of the lubricating oil with the refrigerant in a refrigeration system will cause______.

  A.carbon deposits on the compressor suction valves B.the evaporator temperature to increase C.rapid corrosion of the thermal expansion valve D.no operating problems

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