Quiz 1 ( Q2 )
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| Skydrol® is dyed ______________ in color? | Purple
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| Depressurization of the hydraulic system is NOT necessary when servicing closed hydraulic components. | False
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| In the absence of a specific replacement instructions, a recommended service life of return filters are: | 1,500 hours
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| Pascal's Law states that pressure applied to any part of a confined liquid is transmitted with undiminished intensity to every other part. | True
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| What is viscosity in reference to aircraft hydraulic systems. | A measure of a hydraulic fluid's internal resistance to flow.
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| 6. The three principal categories of hydraulic fluids are: (This question has multiple answers) | Phosphate esters, Polyalphaolefins, Minerals
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| 7. What mineral-based hydraulic fluid can be used as a rust-inhibitor alternative to MIL-H-5606? | MIL-H-6083
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| 8. Aircraft hydraulic systems designed around Skydrol® fluids should be virtually trouble-free if properly serviced. | True
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| 9. What are the two general types of contamination found within hydraulic systems? | abrasives and non abrasives
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| 10. During a routine contamination check, hydraulic fluid that appears to be visibly clean is good/usable fluid. | False
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| 11. Skydrol® is a registered trade name of which company? | Monsanto Chemical Co.
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| 12. Which of the following seals is not compatible with Skydrol®? | neoprene and Buna-N
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| 13. Hydraulic operations are roughly ___________ percent efficient, with _______________ loss due to friction. | 100, negligible
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| 14. MIL-H-5606 is dyed ______________ in color? | Red
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| 15. In addition to viscosity, what are three important characteristics of hydraulic fluids that manufactures take into account? | fire point, flash point, and chemical stability
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| 16. One of the main advantages of Skydrol® is its ___________________ | wide operating temperatures.
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| 17. When performing a "clean cycling" of a hydraulic system suspected of contamination, a hydraulic ground power unit (HGPU) should be used to clean the system. | False
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| 18. When taking hydraulic samples for testing, always drain ______________ of fluid before taking the tested sample. | 1 pint
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| 19. System operating pressure may vary from a couple hundred PSI in small aircraft and rotorcraft to _____ in large transports. | 5,000 psi
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| 20. Which hydraulic fluid is polyalphaolefin based? | MIL-H-83282
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