MM3531 Aircraft Systems - Chapter 2
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Questions and Answers

What is a primary function of pneumatic systems in aircraft?

  • Driving hydraulic pumps
  • Cooling aircraft systems
  • Propelling the aircraft
  • Operating emergency devices (correct)

    • Which of the following accurately describes a key difference between pneumatic and hydraulic systems?

  • Pneumatic systems are generally more reliable than hydraulic systems
  • Hydraulic fluids are compressible while pneumatic gases are incompressible
  • Hydraulic systems utilize incompressible fluids while pneumatic systems use compressible gases (correct)
  • Pneumatic systems use fluids while hydraulic systems use gases

    • What is the main disadvantage of relying solely on an emergency bottle for pneumatic power?

  • It is not recharged in flight after use (correct)
  • It requires a constant power source
  • It has a shorter lifespan than hydraulic systems
  • It can only operate at low pressures

    • In a high pressure pneumatic system, how is air typically charged into an emergency bottle?

    <p>Through a ground-operated compressor</p> Signup and view all the answers

    Which of the following components is essential in maintaining air supply within a pneumatic system?

    <p>Shut off valve</p> Signup and view all the answers

    What function does a high pressure pneumatic system NOT typically perform in aircraft?

    <p>Propelling the aircraft</p> Signup and view all the answers

    When comparing pneumatic and hydraulic systems, which statement is correct?

    <p>Both systems operate under similar principles but differ in fluid compressibility.</p> Signup and view all the answers

    Which gases are common in charging emergency pneumatic bottles?

    <p>Compressed air, Carbon dioxide, Nitrogen</p> Signup and view all the answers

    What is one of the roles of pneumatic systems during hydraulic system failure?

    <p>Emergency extension of landing gear</p> Signup and view all the answers

    What operational advantage do pneumatic systems provide over hydraulic systems?

    <p>Pneumatic systems are lighter than hydraulic systems</p> Signup and view all the answers

    What is one common disadvantage of using a pneumatic system compared to hydraulic systems?

    <p>Pneumatic systems can be affected by temperature changes.</p> Signup and view all the answers

    What is the primary purpose of an intercooler in a pneumatic system?

    <p>To reduce the heat generated during air compression.</p> Signup and view all the answers

    Which option best describes the role of a chemical drier in a pneumatic system?

    <p>It absorbs moisture that collects in the lines.</p> Signup and view all the answers

    What characteristic of pneumatic systems contributes to potential safety advantages?

    <p>Unlimited air supply.</p> Signup and view all the answers

    In a two-stage air compressor, what is a typical reason for incorporating stages?

    <p>To decrease the temperature of the compressed air.</p> Signup and view all the answers

    What is an advantage of pneumatic components over electric components in terms of system design?

    <p>They are lighter and simpler.</p> Signup and view all the answers

    What potential issue can moisture in a pneumatic system directly lead to?

    <p>Freezing and corrosion of components.</p> Signup and view all the answers

    What is a unique feature of pneumatic systems compared to hydraulic systems?

    <p>They are free from fire hazards.</p> Signup and view all the answers

    Which factor primarily affects the efficiency of air compression in two-stage compressors?

    <p>Heat dissipation through intercooling.</p> Signup and view all the answers

    What is the main advantage of using pneumatic systems over electric systems?

    <p>Pneumatic systems can operate in extreme conditions.</p> Signup and view all the answers

    What is a primary advantage of pneumatic systems over hydraulic systems?

    <p>They do not require a pressure reservoir.</p> Signup and view all the answers

    What is the function of air compressors in pneumatic systems?

    <p>To recharge air bottles when pressure is used.</p> Signup and view all the answers

    Which component is not typically found in a pneumatic system?

    <p>Reservoir</p> Signup and view all the answers

    How is bleed air for pneumatic systems generally acquired?

    <p>From the aircraft engine's compressor stage.</p> Signup and view all the answers

    What can happen if air compressors are not maintained correctly?

    <p>They may fail to recharge air bottles properly.</p> Signup and view all the answers

    Which of the following statements best describes pneumatic systems?

    <p>They utilize gas to create pressure without using heavy components.</p> Signup and view all the answers

    Which component is similar between both pneumatic and hydraulic systems?

    <p>Actuators</p> Signup and view all the answers

    What can be inferred about the weight efficiency of pneumatic systems?

    <p>They are lighter due to lack of liquid reservoirs.</p> Signup and view all the answers

    Which of these systems is most likely to recharge air bottles during operation?

    <p>Pneumatic system using engine bleed air.</p> Signup and view all the answers

    What type of components are usually absent in a pneumatic system?

    <p>Pressure regulators</p> Signup and view all the answers

    Study Notes

    MM3531 Aircraft Systems - Chapter 2: Pneumatic Power System

    • Pneumatic power systems are used in some aircraft, often as a backup or for specific functions where hydraulic systems aren't required

    • Compared to hydraulic systems, pneumatic systems offer advantages like lightweight components, unlimited air supply and avoidance of fire hazards during use

    • The pneumatic system in aircraft might be used for: braking systems, opening/closing doors, operating hydraulic pumps or other emergency devices

    • Different sources of input for pneumatic systems include: air bottles, ground supplies, and compressors

    • A typical high-pressure pneumatic system uses various components with distinct working principles and functions. These components are interconnected in a network for the distribution of compressed air.

    • Air bottles are filled with air from a ground charging station. Compressed air, carbon dioxide, or nitrogen are options.

    • The disadvantage of relying solely on emergency bottles is that they cannot be refilled in-flight

    • Compressed air can sometimes be supplied by bleed air from the aircraft engine or an air compressor

    • Components in a pneumatic system might include air compressors, pressure regulators, moisture separators, filters, and various valves

    • Compressors are used to recharge the air bottles when needed

    • Types of compressors include single-stage reciprocating compressors and two-stage air compressors

    • Intercoolers are used in two-stage air compressors to reduce heat generated during compression

    • Moisture separators and chemical driers in the pneumatic system prevent moisture buildup that could hinder the system's functions

    • Diagrams of the complete pneumatic system and its components and how they interact with other aircraft systems (e.g. brakes) are provided in the supporting material

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    Related Documents

    Chapter 2.1 Pneumatic Power System PDF

    Description

    Explore the intricacies of the pneumatic power system used in aircraft. This chapter covers its advantages over hydraulic systems, various applications, and sources of input, along with the typical components involved. Understand how these systems ensure safety and performance in aviation.

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