Refrigeration License Written Test Study Material #2 Exam Questions With Correct Answers

What may be the cause of compressor knocking? - ANS Liquid refrigerant slugging in the compressor. What will happen if the Spring on the TEV was to break ? - ANS Flood the evaporator and raise suction pressure. What happens in the TEV equalizer line when pressure drops in the evaporator ? - ANS The TEV equalizer compensates for the loss in pressure. What is the function of the Service Valve Stem Cap ? - ANS To protect the valve from leaking the refrigerant. What is the primary advantage of Semi Hermetic compressors over fully Hermetic ones. - ANS That a Semi Hermetic compressor can be serviced or repaired. What happens when a portable compressor recovery unit is used to recover vapor from the system ? - ANS The vapor density is decreased. What is the purpose of using un-loaders ? - ANS To decrease capacity in the compressor. What determines the amount of pressure that flows through the orifice plates ? - ANS The pressure differential between the high and low sides. The best way to test a thermometer is ? - ANS By testing in it in ice cold water or placing it in the freezer. How many Phases will a 3 HP electric motor use ? - ANS It will use 3 phases. What causes a restriction of refrigerant flow from the high side to the low side ? - ANS The TEV, TEV. When a Halide torch turns from blue to green or purple, it means that: - ANS A leak was detected. How is AC voltage turned into DC voltage ? - ANS With a Rectifier What device is used to cycle a compressor On and Off ? - ANS A Thermostat. The crankcase breather line is used to prevent what in the compressor? - ANS Oil from slugging. The 3 areas the middle port on a manifold gauge can be connected to are ? - ANS The Recov