ESCO Light Commercial Refrigeration EXAM with Complete Solutions

ESCO Light Commercial Refrigeration EXAM with Complete Solutions 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: A. operate at high efficiency. B. ensure that frost does not accumulate. C. sub-cool the compressor. D. ensure proper oil return. --*correct answer*--A. operate at high efficiency. The difference between the temperature of the refrigerant boiling in the evaporator and the temperature at the evaporator outlet is known as: A. evaporator superheat. B. latent heat. C. evaporator sub-cooling. D. sublimation. --*correct answer*--A. evaporator superheat. An expansion device that is stuck open will cause: A. low suction pressure B. a starved evaporator. C. excessive superheat D. a flooded evaporator --*correct answer*--D. a flooded evaporator