UNIT 79 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX
79-1) Why is outside air mixed with return air?
79-2) How much outside air should be admitted to a space?
79-3) Can outside air ever be completely shut off from a space?
79-4) When will a preheater turn on?
79-5) What is the purpose of a filter status differential pressure switch?
79-6) Why are steam or electric reheaters inefficient?
79-7) What is an advantage of a high velocity air distribution system?
79-8) How does duct static air pressure affect the supply fan load?
79-9) How does a perimeter heating or cooling load differ from a core load?
79-10) What type of an air distribution system is a core zone most likely to have?
79-11) Can constant volume fans be used in variable air volume systems?
79-12) Why are variable inlet guide vanes sometimes used for supply fans?
79-13) What is meant by a modulating damper?
79-14) What is an advantage of face and bypass control dampers?
79-15) What is the difference between a draw-through air system and a blow-through
air system?
79-16) How do carbon dioxide levels relate to outside air supply requirements?
79-17) What are the common types of preheaters that are used?
79-18) What are the three common classifications for commercial air distribution
systems?
79-19) What is the principle of operation for an economizer?
79-20) How do direct expansion cooling coils differ from indirect expansion coils?
79-21) How is the total amount of cool air in CFM required for a particular space
determined?