If a refrigeration compressor is running continuously withou

第1题

单选题Low compressor head pressure in a refrigeration system can be caused by（）.A insufficient condenser cooling waterB excessive condenser cooling waterC air in the refrigeration systemD excessive refrigerant in the system

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第2题

单选题When liquid reaches the compressor of a refrigeration system through the suction line, the condition is called （）.A flooding backB superheatingC overflowingD recycling

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第3题

单选题Excessive oil foaming in the crankcase of a refrigeration compressor can result in （）.A overheated compressor bearingsB excess lube oil viscosityC carbon deposits on the compressor piston ringsD wax crystals forming in the lubricant

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第4题

单选题Short cycling of a refrigeration compressor refers to （）.A frequently grounding outB frequently starting and stoppingC running too fastD running too slow

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第5题

单选题If a refrigeration system were short of refrigerant, the condition would result in （）.A continuous running of the compressorB high suction pressureC high discharge pressureD short cycling of the compressor on the water failure switch

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第6题

单选题If a refrigeration compressor is running continuously without lowering the temperature in the refrigerated space, the trouble may be （）.A a shortage of compressor oilB warm food in the refrigeratorC excessive condenser cooling waterD a shortage of refrigerant

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第7题

单选题Badly leaking refrigeration compressor discharge valves will cause（）.A overfeeding of the expansion valveB damage to the condenserC constant running of the compressorD flooding of the receiver

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