Hydraulic Fluids Quiz
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Questions and Answers

What type of fire point is desirable for hydraulic fluids?

  • Medium
  • Low
  • High (correct)
  • Variable

Which type of fluid is mainly used in small aircraft hydraulic systems?

  • MIL-H-5606 (correct)
  • MIL-H-83299
  • MIL-H-83287
  • MIL-H-83283

What type of filter element is typically cleaned and replaced in hydraulic systems?

  • Paper-type filters
  • Activited carbon filters
  • Metal mesh filters (correct)
  • Nylon filters

What is the primary source of energy in an aircraft hydraulic system?

<p>Electric motor pumps (B)</p> Signup and view all the answers

What does a nonpositive displacement pump do when it rotates?

<p>Moves a specific volume of fluid each time (D)</p> Signup and view all the answers

What does an actuator do in the context of hydraulic systems?

<p>Transforms flow energy into mechanical work (D)</p> Signup and view all the answers

What is the function of an actuator in a hydraulic system?

<p>To produce the power required for movement (A)</p> Signup and view all the answers

Why do most reservoirs in aircraft hydraulic systems have baffles and/or fins?

<p>To maintain fluid movement and prevent foaming (A)</p> Signup and view all the answers

What is the typical range of operating pressures for aircraft hydraulic systems?

<p>2,000 psi to 5,000 psi (B)</p> Signup and view all the answers

Which of the following is NOT a main category of hydraulic fluids?

<p>Silicone-based fluid (B)</p> Signup and view all the answers

What is the primary function of filters in a hydraulic system?

<p>To provide control over contamination (B)</p> Signup and view all the answers

Where is bleed air used to pressurize the hydraulic tank taken from?

<p>Engine compressor or APU (C)</p> Signup and view all the answers

What is the function of seals in a hydraulic system?

<p>To prevent fluid leakage and keep air/dirt out of the system (D)</p> Signup and view all the answers

Which of the following statements regarding hydraulic fluids is TRUE?

<p>Chemical stability helps resist oxidation and deterioration in hydraulic fluids (A)</p> Signup and view all the answers

What does the fire point of a liquid represent?

<p>The temperature at which the liquid ignites momentarily when exposed to a flame (D)</p> Signup and view all the answers

Why is chemical stability an important property when selecting a hydraulic fluid?

<p>To resist oxidation and deterioration over time (B)</p> Signup and view all the answers

What is the flash point of a substance?

<p>The temperature at which the substance gives off vapor and ignites momentarily (B)</p> Signup and view all the answers

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