What are the three feeds? {Ans: DX or dry expansion, overfeed or recirculated, and flooded or gravity.}An air evaporator that is tubed with fins, by design what happens to the spacing of the fins as systems are designed for colder applications? {Ans: Once design temperatures are below -32° F, the fins must be spaced further apart due to freezing of moisture.}What does the expansion device do {Ans: Control flow}The glow of the sun would be an example of what type of heat transfer? {Ans: Radiation}What is the tax gas/flash/gas ( non-refrigeration effect ) in operating an ammonia refrigeration system? With the evaporator at 10°F in the condenser at 85°F {Ans: 15%}If you see a green diamond with the number 1005 on the transportation vehicle, what is inside the tank. A. Carbon Dioxide B. Ammonia C. Propane D. Natural Gas {Ans: B. Ammonia}Ammonia causes cancer. A. True B. False {Ans: B. False}In a baffled shell and tube heat exchanger {Ans: Ammonia refrigerant flows through the tubes}The fuel range for pure Ammonia is _____________% to _____________% ammonia, the remaining concentration air. {Ans: 15% to 28%}Approximately how many BTU's does it take to convert