6-10. Fuel trucks that are more than half full are limited to a recirculation time of how many minutes? 1. 10 2. 15 3. 3 4. 5 6-11. Weekly checks are performed weekly and when a piece of equipment is being returned to service after being down for more than how many hours? 1. 12 hr 2. 24 hr 3. 48 hr 4. 72 hr 6-12. When are engine spark checks performed? 1. Every week 2. In the morning 3. In the afternoon 4. At night 6-13. Unless element problems require an earlier change, how often are filter and monitor elements changed? 1. Every 6 months 2. Every year 3. Every 3 years 4. Every 5 years 6-14. Filter and monitor elements require changing if the pressure drop across either unit reaches what total use? 1. 15 psi 2. 20 psi 3. 25 psi 4. 30 psi 6-15. Filter and monitor elements require changing if the pressure drop across both units reaches what total psi? 6-16. What problem may be indicated by a significant drop in differential pressure? 1. An element rupture 2. A leak in the downstream side from the filter or monitor 3. Clogged elements 4. Excessive water in the feed fuel 6-17. Which of the following operations must be immediately terminated if a spill or leak of any size occurs? 1. Sampling 2. Hot refueling 3. Cold refueling 4. Refueling support equipment 6-18. Large spills require handling by the Spill Response Team. What size spill is/are considered a large spill? 1. More than 10 square feet 2. Greater than 10 feet in any direction 3. More than 50 square feet 4. Both 2 and 3 above 6-19. What is the minimum number of personnel required when cold refueling aircraft at a pit? 1. Five 2. Two 3. Three 4. Four 6-20. Which of the following is a characteristic of deadman controls? 1. They are normally blocked open to allow the operator to perform other duties 2. They are never blocked open 3. They are used only in pits 4. They are used only when hot refueling aircraft 1. 15 psi 2. 20 psi 3. 25 psi 4. 30 psi 39