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HVACR Journeyman Practice Exam Question and Answers

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HVACR Journeyman Practice Exam Question and Answers In a (direct expansion) evaporator, liquid refrigerant must boil away as close to the end of the coil as possible in order to: Operate at High Efficiency. What is one of the main reasons that reciprocating compressors are not 100% efficient? Clearance Volume A dirty evaporator and return air filters subsequently causes low evaporator pressures which will cause High Compression Ratios The automatic expansion valve (AEV) maintains a constant ______ in the evaporator. Pressure Short cycling during pump down can be caused by a leaking compressor suction valve. What type metering device is best suited in applications where freeze protection is required? Automatic Expansion Valve (AEV) The "Fan Cycle Control" is used in conjunction with low ambient temperature conditions to control __________. Condenser Pressure What do water cooling towers require? Periodic de-scaling A refrigeration system used to cool another refrigeration system is called a _______. Cascade System

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