ESCO Light Commercial Refrigeration Exam, Exams of Nursing

Download ESCO Light Commercial Refrigeration Exam and more Exams Nursing in PDF only on Docsity! ESCO Light Commercial Refrigeration EXAM In a dry type (direct expansion) evaporator, liquid refrigerant must boil away as close to the end of the coil as possible in order to: - Question and answers The difference between the temperature of the refrigerant boiling in the evaporator and the temperature at theevaporator outlet is known as: - Question and answers An expansion device that is stuck open will cause: - Question and answers When measuring evaporator superheat on a commercial system that has a long suction line, the pressure reading should be taken at the: - Question and answers Superheat measurements are best taken: - Question and answers Atechnician is checking the superheat on a multi-circuit evaporator and finds one of the circuits has a superheat that is higher than the others. This could be caused by: - Question and answers A TEV with an external equalizer is used on: - Question and answers Dry type evaporators operate most efficiently with a superheat setting of approximately: - Question and answers An evaporator used to chill liquids si operating with a normal superheat setting, but the system is not cooling the product properly. Which of the following is the most likely cause? - Question and answers What time interval is required between each superheat adjustment? - Question and answers Alow temperature evaporator used for cooling space or product refrigeration: - Question and answers Some special applications use aflooded evaporator (operated full of refrigerant). nI order to maintain the proper level of liquid refrigerant, a type metering device is used. - Question and answers A properly functioning condenser will first; - Question and answers The effect of an inefficient water cooled condenser will; - Question and answers The refrigerant condensing temperature in a water cooled condenser is normally about higher than the leaving water. - Question and answers The refrigerant in an air cooled condenser will normally condense at approximately higher temperature than the air passing over it. - Question and answers Workable head pressure during periods of lowambient temperature can be achieved by using; - Question and answers Cooling towers that pass air over water to remove system heat are limited in capacity by: - Question and answers Parallel compressors often referred to as a rack system may use; - Question and answers The major difference between a cooling tower and an evaporative condenser is: - Question and answers Multiple compressors provide: - Question and answers Adirty evaporator and subsequent low evaporator pressures will cause: - Question and answers he thermostatic expansion valve (TV) maintains a constant__________ in the evaporator. - Question and answers What type of ice si made with a commercial cie maker that uses a gear motor and auger? - Question and answers Some capillary tube systems take advantage of heat exchange by soldering the capillary tube to the suction line. In order to obtain the correct superheat reading, it must be taken: - Question and answers A_____________is usually required for ultra-low temperature applications. - Question and answers A hot gas defrost cycle can be initiated by a: - Question and answers When the defrost cycle is terminated, the evaporator fans will: - Question and answers An off-cycle defrost method is often used on evaporators operating at a minimum of; - Question and answers The oil separator is installed in the: - Question and answers If an oil separator is not used: - Question and answers If a system has a long suction line riser an oil trap should be installed; - Question and answers The relationship between low-side absolute pressure and high-side absolute pressure is called: - Question and answers Capacity control of a large compressor can be performed with: - Question and answers Vibration eliminators should be installed_________to the compressor crankshaft centerline. - Question and answers What (Ph) level is considered neutral and desired for ice machine or cooling towers applications; - Question and answers On a rack of multiple compressors, each compressor is controlled by: - Question and answers Which refrigerant line is most sensitive to improper sizing - Question and answers What is the most likely cause fo the following symptoms? The compressor shuts of on the oil pressure switch. Teh oil sight glass si 1/2 ful. Suction pressure si 3pig (R-502). Oil pressure is 70 psig. - Question and answers A Michigan serviceman is called to a supermarket on a cold winter day because all the frozen food is melting. Alow temperature rack of five compressors control the frozen food and ice cream units. Power supply is OK, but al compressors are of. Al five low pressure controls are open. The liguid receiver shows full. The hot gas discharge line is cold because the condenser is on the roof. What si the likely cause of the trouble? - Question and answers A string of five frozen food cases are operated by one compressor. All five cases are iced up. What is the likely problem? - Question and answers At what evaporator temperature does an ice maker begin to make ice? - Question and answers What device is used ot check for parallel misalignment of a motor coupling? - Question and answers Defrosting a low temperature evaporator can be accomplished by: - Question and answers A system that uses an Automatic Expansion Vvael (AEV) is not cooling enough and running continuously. The gauges reveal low head pressure, but the suction pressure is acceptable. This could be caused by - Question and answers