Massachusetts Refrigeration Test with Questions and Answers

Massachusetts Refrigeration Test with Questions and Answers Which is an organic refrigerant ANSWER R-717 Which refrigerant is lighter than air ANSWER 717 Which occupancy classification can ammonia be used it ANSWER Depends on the quantity The purpose of a receiver is ANSWER To increase the capacity that a system can hold How do you find the net oil pressure on a compressor ANSWER Gross oil pressure-suction pressure What is the minimum height of Freon piping in an open space? ANSWER 7.25' What will happen if "purging" is not done in a Freon system ANSWER High pressure Systems in low temp applications should use what type of oils ANSWER Low pour point What device should be used on low temp freezers ANSWER Oil separator