12-39. What color is liquid oxygen in an aircraft oxygen system? 1. White 2. Light blue 3. Yellow 4. Light green 12-40. At what temperature does liquid oxygen turn or boil into gaseous oxygen? 1. 212°F 2. -32°F 3. -297°F 4. 121°F 12-41. What is the usual mixture of aircraft anti-icing fluids? 1. 90% alcohol and 10% glycerin 2. 75% alcohol and 25% glycerin 3. 45% alcohol and 55% glycerin 4. 85% alcohol and 15% glycerin 12-42. What fire-extinguishing agent should be applied to extinguish an ignited Mk 45 or LLU-2 parachute flare? 1. Halon 1211 2. AFFF 3. Low-velocity fog 4. PKP 12-43. What fire extinguishing agent should NOT be directed into a battery compartment to effect cooling or to displace explosive gases because of the risk of explosion? 1. CO₂ 2. AFFF 3. Water fog 4. PKP 12-44. What fire-extinguishing agent is used to lower the temperature of an aircraft battery that is in a thermal runaway condition when no flame or fire is present? 1. CO₂ 2. AFFF 3. Water fog 4. PKP 12-45. Because of the potential hazards to personnel, what additional protection is necessary for personnel to combat composite fibers resulting from an aircraft fire? 1. More fire party personnel 2. Respiratory protection 3. Additional proximity suit liner 4. Special eyewear 12-46. What advantage(s) does composite materials reinforced with carbon/graphite fibers provide in advanced aircraft construction? 1. Superior stiffness 2. High strength-to-weight ratio 3. Ease of fabrication 4. All of the above 12-47. In composite aircraft construction, boron fibers pose less of a problem to unprotected electrical equipment than carbon or graphite fibers. 1. True 2. False 12-48. What area of an aircraft is the most common source of aircraft crash fires? 1. Engine compartment 2. Landing gear 3. Wing fuel tanks 4. Ordnance/stores 12-49. How are aircraft fluid lines identified? 1. By the diameter and length of the line 2. By the material it is made of 3. By etched markings in the center 4. By bands of paint or strips of tape around the line 12-50. On aircraft fluid lines, steel tags can be used in place of identification tape or decals on lines of what diameter? 1. 1 inch 2. 2 inches 3. 3 inches 4. 4 inches or larger 12-51. What do identification tape codes indicate on aircraft fluid lines? 1. Function and contents 2. Hazards and direction of flow 3. Pressure in the fluid line 4. All of the above 12-52. How many general classes of hazards are found in connection with fluid lines? 1. One 2. Two 3. Three 4. Four 12-26