6-40. What is considered to be the "heart" of a gas turbine engine fuel system? 1. Fuel control 2. Fuel cell pumps 3. Fuel cross-feed valves 4. Fuel shutoff valve 6-41. Which of the following inputs does the fuel control system combine to operate a gas turbine engine? 1. Fuel flow, compressor pressure, turbine speed, and temperature 2. Combustion, ignition, altitude, fuel flow, and acceleration 3. Engine speed, altitude, exhaust temperature, and throttle position 4. Throttle position, compressor discharge pressure, engine speed, and compressor inlet temperature 6-42. What lubrication system returns engine oil back to the oil tank for reuse? 1. Pressure pump system 2. Wet sump system 3. Scavenge system 4. Pressurized sump system 6-43. The purpose of a pressurized oil tank in the lubricating system of a gas turbine engine is to prevent pump cavitation under what condition? 1. High altitude 2. Engine start 3. Low altitude 4. Engine stop 6-44. The lubricating system used on a gas turbine engine is, with few exceptions, always the dry sump design. 1. True 2. False 6-45. What type of oil is used in all gas turbine engine lubrication systems? 1. Synthetic oil 2. Petroleum-based oil 3. Animal fat-based oil 4. Mineral-based oil 6-46. What  type  of  ignition  system  has  been universally accepted for use in a gas turbine engine? 1. Low spark, capacitor 2. High capacitor, low spark 3. High energy, capacitor 4. Low capacitor, low energy 6-47. To avoid a lethal electrical shock from the ignition  system,  which  of  the  following components must be grounded before maintenance work can be started? 1. Resistors 2. Igniter plugs 3. Spark plugs 4. Capacitors 6-48. The accessory section is usually mounted to what section on a gas turbine engine? 1. Turbine section 2. Combustion section 3. Compressor section 4. Exhaust section 6-49. The term used to describe a process that begins with certain conditions and ends with those same conditions is known as "Brayton Cycle." 1. True 2. False 6-50. The MIL-STD-1812 designation system has no provision for what branch of the armed forces? 1. Navy 2. Army 3. Air Force 4. Coast Guard IN ANSWERING QUESTIONS 6-51 THROUGH 6-53, REFER TO TABLE 6-1. 6-51. What aircraft letter symbol identifies a turbojet engine? 1. RJ 2. R 3. J 4. T 6-52. What aircraft letter symbol identifies a turboshaft engine? 1. R 2. J 3. T 4. TF 6-53. What aircraft letter symbol identifies a turbofan engine? 1. R 2. J 3. T 4. TF 6-24