5-24. If the hydraulic fluid test filter displays a rust color, what color contamination standard should you use for comparison? 1. Tan 2. Rust 3. Gray 4. Silica 5-25. An electronic particle count analysis of hydraulic fluid will NOT be affected by particles smaller than what size? 1. 50 microns 2. 25 microns 3. 15 microns 4. 5 microns 5-26. The halogen leak detector is powered by what source of energy? 1. Solar 2. Battery 3. 110 volts ac 4. 220 volts ac 5-27. When you circulate contaminated fluid through the filters in an aircraft and a portable hydraulic test stand, you are using which of the following decontamination methods? 1. Purging 2. Flushing 3. Purifying 4. Recirculation cleaning 5-28. Unless specified by other publications, a hydraulic system undergoing the recirculation cleaning process should be cycled a minimum of how many complete cycles? 1.  5 cycles 2. 10 cycles 3. 15 cycles 4. 25 cycles 5-29. You should perform a hydraulic fluid patch test from what system component to determine when system flushing is complete? 1. System reservoir fluid 2. System return line fluid 3. System pressure line fluid 4. Test stand reservoir fluid 5-30. Test stands used for hydraulic system flushing must have an internal reservoir that holds what minimum number of gallons? 1. 10 gal 2. 14 gal 3. 16 gal 4. 20 gal 5-31. Which of the following authorities is required to recommend and supervise an aircraft hydraulic system purging? 1. The commanding officer 2. The maintenance officer 3. The cognizant engineering activity 4. The cognizant functional wing commander 5-32. When a hydraulic system is purified, the fluid going to the purification tower is first filtered by what size filter? 1. 5 micron 2. 15 micron 3. 3 micron 4. 25 micron 5-33. When considering maintenance man- hours and material requirements, what method of hydraulic system decontamination is the most effective? 1. Purging 2. Flushing 3. Purifying 4. Recirculation cleaning 5-34. What fire-resistant type of hydraulic fluid was developed to replace MIL-H-5606? 1. MIL-H-6083 2. MIL-H-83282 3. MIL-H-46170 4. MIL-H-81019 5-35. Which of the following types of hydraulic fluids is used in extremely low temperatures? 1. MIL-H-5606 2. MIL-H-46170 3. MIL-H-81019 4. MIL-H-83282 5-36. When servicing hydraulic systems, you should use what type of filtration? 1. 3-micron (absolute) 2. 3-micron (nominal) 3. 5-micron (absolute) 4. 5-micron (nominal) 24