Assignment 5 Textbook Assignment: “Pressurization and Air-Conditioning Systems”; and “Oxygen Systems.” Pages 3-17 through 4-3. Learning Objective: Recognize the operating principle of a vapor cycle air conditioning system and identify system components and their functions. ITEMS 5-1 THROUGH 5-2 PERTAIN TO THE VAPOR CYCLE AIR-CONDITIONING SYSTEM USED ON THE E-2 AIRCRAFT. 5-1. In what system component is the pressure of the refrigerant increased to the point that its condensing temperature is above the temperature of the water or air used for condensing purposes? 1. Expansion valve 2. Evaporator 3. Compressor 4. Condenser 5-2. (Refer to figure 3-12 and supporting material in the text.) Which of the following is the flow sequence for refrigerant through the system? 1. Receiver subcooler expansion valve evaparator subcooler compressor condenser receiver 2. Receiver subcooler evaparator subcooler expansion valve compressor condenser r e c e i v er 3. Receiver condenser subcooler compressor evaporator subcooler expansion valve r e c e i v er 4. Receiver expansion valve compressor subcooler condenser evaparator subcooler receiver 5-3. The air delivered to the aircraft avionics compartment is controlled within which of the following temperature ranges? 1. 33° ±5°C 2. 38° ±5°C 3. 38° ±5°F 4. 43° ±5°F 5-4. What is the source of power for the compressor and the evaporator fan mounted on the evaporator assembly? 1. Ram air driven motor 2. Hydraulically driven motor 3. Electrically driven ac motor 4. Electrically driven dc motor 5-5. During ground operation with engines running and insufficient ram air across the condenser for cooling, what component allows engine bleed air to be used to increase airflow across the condenser? 1. Thermostatic expansion valve 2. Ram air scoop actuator 3. Ejector air shutoff valve 4. Condenser pressure transducer 5-6. With the equipment cooling switch set to ON, what valve is energized to direct hydraulic pressure to the compressor drive motor and evaporator assembly fan motor? 1. Service 2. Shutoff 3. Lower charge 4. Thermostatic expansion 30