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UNIT 76 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX
76-1) Define residential air conditioning.
76-2) List at least 5 types commercial air conditioning applications.
76-3) If a direct expansion coil delivered from the factory has lost its nitrogen press
charge, what should be done?
76-4) How should an external equalizing line for a TEV be connected to a horizontal
run?
76-5) List the different types of staging that can be used for air handler compressors
using direct expansion coils.
76-6) What is the difference between a primary and a secondary refrigerant?
76-7) What is a special ventilation consideration for restaurants, nightclubs, and casinos?
76-8) What type of water should be used in a chilled-water system?
76-9) What consideration should be given to office spaces when determining space
heating and cooling loads?
76-10) State the two variations of single package conditioners and the tonnage capacity
ranges of each.
76-11) The single package conditioner in horizontal variation may come equipped with 7
features. What are these?
76-12) What are the differences between a rooftop air conditioner and a single package
air conditioner?
76-13) Why are rooftop units popular on small commercial buildings?
76-14) Explain what would happen if an HVACR contractor violated a bonded roof by
putting in a vent pipe?
76-15) Could a packaged rooftop unit be adapted for both heating and cooling?
76-16) How are hermetic compressors cooled?
76-17) What types of compressors are commonly used for chillers?
76-18) Why do many central system chillers use water cooled condensers?
76-19) What is moisture regain?
76-20) List some of the airborne particles that may be released in an industrial
manufacturing process.
76-21) How should hot water heating coils be piped?
76-22) What happens if the steam trap at the outlet of a heating coil is stuck in the closed
position?
76-23) Should heating and cooling coil exterior surfaces ever be cleaned?
76-24) What are the two common types of coil corrosion?
76-25) What happens when metal oxides are formed on the coil tube surfaces?
76-26) What is galvanic corrosion?
