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

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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 a refrigeration system, if the cooling water to the condenser fails, the（）.

  A . box temperature solenoid valve will close B . expansion valve will close C . compressor will shutdown D . king valve will ope

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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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• One cause of high head pressure occurring in a refrigeration system can be （）.

  A . insufficient cooling water flow to the condenser B . a low refrigerant charge in the system C . the liquid valve is open too much D . high evaporator superheat

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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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• In a refrigeration system, foaming of the crankcase oil may cause the （）.

  A . expansion valve to overfeed B . compressor to knock C . water regulating valve to fail D . crankcase drains to plug

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• The effect of high vapor superheat in a refrigeration system, is a/an （）.

  A . increased capacity of the compressor B . more efficient operation of the thermal expansion valve C . decreased capacity of the compressor D . loss of receiver capacity

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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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• 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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• A refrigeration system compressor crankcase is sweating or unusually coldThis is an indication of（）.

  A . a shortage of refrigerant in the system B . air in the system C . an accumulation of liquid refrigerant in the crankcase D . a shortage of oil in the crankcase

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• Low compressor head pressure in a refrigeration system can be caused by（）.

  A . insufficient condenser cooling water B . excessive condenser cooling water C . air in the refrigeration system D . excessive refrigerant in the system

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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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• 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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• A solenoid valve used in a refrigeration system should be installed （）.

  A . with the axis of the solenoid horizontal, sensing temperature of the box, and upstream of the thermal expansion valve B . upright, sensing temperature of the box, and upstream of the thermal expansion valve C . upright, sensing temperature of the box, and downstream of the thermal expansion valve D . upright, sensing heat of the tail coil, and upstream of the thermal expansion valve

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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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• The purpose of the refrigeration system low pressure cutout switch is to （）

  A . protect the compressor from liquid flood back B . protect the compressor from low discharge pressure C . start and stop the compressor upon system demand D . start the compressor after a drop in the evaporator pressure

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• A pressure drop in the liquid line of a refrigeration system may cause（）

  A . the solenoid valve to seize B . the compressor to hunt C . flash gas to form in the liquid line D . the expansion valve to freeze ope

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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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