Navy Aviation Machinist Mate A School Week #1
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Questions and Answers

What is matter?

  • Only solid substances.
  • Anything that takes up space. (correct)
  • A type of fluid.
  • Made up of energy.
  • What are the states of matter?

    Solid, liquid, gas

    Define solid.

    State of matter with a definite shape and volume.

    What is a liquid?

    <p>A state of matter that has a definite volume but no definite shape.</p> Signup and view all the answers

    What is gas?

    <p>A state of matter with no definite shape or volume.</p> Signup and view all the answers

    What does volume refer to?

    <p>The amount of space an object occupies.</p> Signup and view all the answers

    Define mass.

    <p>The amount of matter in an object.</p> Signup and view all the answers

    What is weight?

    <p>A measure of the force of gravity acting on an object.</p> Signup and view all the answers

    What is gravity?

    <p>Force that attracts an object towards the center of the earth.</p> Signup and view all the answers

    Define density.

    <p>Amount or quantity of mass per unit volume.</p> Signup and view all the answers

    What is force?

    <p>The total pressure acting upon an object.</p> Signup and view all the answers

    Define pressure.

    <p>Force per unit area measured in PSI.</p> Signup and view all the answers

    Which of the following are types of pressure? (Select all that apply)

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

    What is static pressure?

    <p>Pressure in a confined space or not causing motion.</p> Signup and view all the answers

    What is impact pressure?

    <p>Pressure caused by motion.</p> Signup and view all the answers

    What is relative pressure?

    <p>One pressure in relation to another.</p> Signup and view all the answers

    Define absolute pressure.

    <p>Sum of the Atmospheric Pressure and System pressure starting from a theoretical vacuum.</p> Signup and view all the answers

    What is Pascal's Law?

    <p>Pressure applied to enclosed or confined fluid is transmitted equally in all directions without loss.</p> Signup and view all the answers

    What does Bernoulli's Principle state?

    <p>Whenever a stream of any fluid has its velocity increase at a given point, the pressure of the stream at that point is less than the rest of the stream.</p> Signup and view all the answers

    What happens in a divergent Venturi tube?

    <p>Decrease velocity and increase pressure.</p> Signup and view all the answers

    What occurs in a convergent Venturi tube?

    <p>Increase velocity and decrease pressure.</p> Signup and view all the answers

    What does Boyle's Law state?

    <p>The volume of a given mass of a gas varies inversely with pressure when temperature is constant.</p> Signup and view all the answers

    What does Charles' Law state?

    <p>If the volume of a confined gas is constant, the pressure is directly proportional to the absolute temperature.</p> Signup and view all the answers

    Which of the following are Newton's Laws of Motion? (Select all that apply)

    <p>Law of Interaction</p> Signup and view all the answers

    Define the Law of Inertia.

    <p>A mass at rest will stay at rest while a mass in motion will stay in motion until acted upon by an outside force.</p> Signup and view all the answers

    What does the Law of Force and Acceleration state?

    <p>When a body is acted upon by a constant force, the acceleration is inversely proportional to its mass (F=ma).</p> Signup and view all the answers

    What does the Law of Interaction state?

    <p>For every action, there is an equal and opposite reaction.</p> Signup and view all the answers

    Define heat.

    <p>Form of energy produced by motion of molecules known as kinetic energy.</p> Signup and view all the answers

    What are the methods of heat transfer? (Select all that apply)

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

    Define conduction.

    <p>Transfer of heat from molecule to molecule.</p> Signup and view all the answers

    What is convection?

    <p>Transfer of heat by means of currents in a fluid caused by uneven heating.</p> Signup and view all the answers

    What is radiation?

    <p>Transfer of heat by means of high-speed particles of energy.</p> Signup and view all the answers

    Define temperature.

    <p>Intensity of hotness/coldness of a mass measured in degrees.</p> Signup and view all the answers

    What is the atmosphere?

    <p>Known as the whole mass of air surrounding the Earth.</p> Signup and view all the answers

    What are the layers of the atmosphere?

    <p>Troposphere, stratosphere, mesosphere, thermosphere.</p> Signup and view all the answers

    Define troposphere.

    <p>Lower level of the atmosphere containing weather.</p> Signup and view all the answers

    What is stratosphere?

    <p>Second level that has an average temperature of -69.7 degrees F and is the best conditions for flying due to dense air.</p> Signup and view all the answers

    Define mesosphere.

    <p>Third level that has conditions that do not allow gas turbine engines to operate due to lack of oxygen.</p> Signup and view all the answers

    What is thermosphere?

    <p>Highest level of the atmosphere that is the electronically charged protection layer for Earth.</p> Signup and view all the answers

    What is the machine principle?

    <p>Application of laws, principles, and theories that'll allow us to develop machines to aid us in our daily work.</p> Signup and view all the answers

    What is the purpose of the machine principle?

    <p>All machines multiply force or speed and one must be lost in order to gain the other.</p> Signup and view all the answers

    What is the process of the machine principle?

    <ol> <li>Work is supplied to the machine (input work). 2. Work is exerted against friction (energy is expanded). 3. Output work is done by the machine (useful work).</li> </ol> Signup and view all the answers

    How is the efficiency of a machine measured?

    <p>By the ratio of work output divided by work input.</p> Signup and view all the answers

    Define hydraulics.

    <p>Defined as the branch of science that deals with the study of liquids in motion.</p> Signup and view all the answers

    What are the principles of hydraulics?

    <ol> <li>Pascal's Law. 2. Based on the idea that a confined liquid will transmit any pressure applied to it until the pressure at any given point is equalized.</li> </ol> Signup and view all the answers

    What is the purpose of hydraulics?

    <p>To move mechanical components accurately and safely with ease.</p> Signup and view all the answers

    Which of the following are components of the hydromechanical system? (Select all that apply)

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

    What is a reservoir?

    <p>Contains supply of fluid used by the system.</p> Signup and view all the answers

    What is the role of the filter in a hydromechanical system?

    <p>Filters out the contamination.</p> Signup and view all the answers

    What does a pump do?

    <p>Creates a flow of fluid.</p> Signup and view all the answers

    What is a pressure relief valve?

    <p>Relieves excess system pressure.</p> Signup and view all the answers

    What does a selector valve do?

    <p>Directs the flow of fluid.</p> Signup and view all the answers

    What is an actuating unit?

    <p>Converts fluid pressure to useful work (mechanical motion).</p> Signup and view all the answers

    What is the role of tubing in a hydromechanical system?

    <p>Transports the fluid throughout the system.</p> Signup and view all the answers

    What is a check valve?

    <p>A valve that allows flow in one direction only.</p> Signup and view all the answers

    What are the two types of contamination? (Select all that apply)

    <p>Non-abrasive</p> Signup and view all the answers

    What is the greatest maintenance hazard for hydraulics?

    <p>Contamination.</p> Signup and view all the answers

    List the origins of contamination.

    <ol> <li>Particles originally contained in the system. 2. Particles introduced from outside the system. 3. Created within the system during operation. 4. Introduced by foreign liquid.</li> </ol> Signup and view all the answers

    What is contamination control?

    <ol> <li>Ensure filters are maintained according to instruction. 2. Hold contamination to a minimal during maintenance.</li> </ol> Signup and view all the answers

    What are the safety considerations for hydromechanical systems? (Select all that apply)

    <p>Hydromechanical systems operate at extremely high pressure (3,000 psi).</p> Signup and view all the answers

    Define power.

    <p>The rate of doing work or the rate of expanding energy.</p> Signup and view all the answers

    What is motion?

    <p>The act or process of changing place or position.</p> Signup and view all the answers

    Define velocity.

    <p>Rate of change of distance with respect to time in a given direction.</p> Signup and view all the answers

    What is acceleration?

    <p>Rate of change of velocity.</p> Signup and view all the answers

    Define energy.

    <p>Ability to do work or bring about changes in matter.</p> Signup and view all the answers

    What is inertia?

    <p>The property of a body to resist changes to its state of rest or motion.</p> Signup and view all the answers

    What is jet propulsion?

    <p>Propelling force generated in the direction opposite to the flow of gas under pressure which is escaping through an opening called a jet nozzle.</p> Signup and view all the answers

    Define standard day.

    <p>59 degrees Fahrenheit with a barometric pressure of 29.92 inches of mercury (14.7 psi), 0 humidity, and 0 wind velocity.</p> Signup and view all the answers

    What is the Brayton Cycle?

    <p>The name given to the thermodynamic cycle of a gas turbine engine to produce thrust.</p> Signup and view all the answers

    What are the four continuous and constant events in the Brayton Cycle?

    <p>Intake, Compression, Combustion, and Exhaust.</p> Signup and view all the answers

    What are the types of thrust classification? (Select all that apply)

    <p>Net Thrust</p> Signup and view all the answers

    Define static thrust.

    <p>Thrust produced when the aircraft or engine has no forward motion.</p> Signup and view all the answers

    What is net thrust?

    <p>Thrust available to power the aircraft in flight.</p> Signup and view all the answers

    What are the variables affecting thrust? (Select all that apply)

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

    Where is the front frame section located?

    <p>Mounted on the front of the compressor.</p> Signup and view all the answers

    What are the five components of the compressor?

    <p>Casing, Rotor Assembly, Stator Assembly, Exit Guide Vanes, and the Diffuser.</p> Signup and view all the answers

    What is the purpose of the compressor section?

    <p>To supply compressed air in sufficient quantities to satisfy the requirements of the combustion section.</p> Signup and view all the answers

    Define compressor casing.

    <p>Outer housing for the compressor. Stator assembly mounted to this.</p> Signup and view all the answers

    What is the compressor rotor assembly?

    <p>Compressor blades that accelerate the air rearward.</p> Signup and view all the answers

    What is the stator assembly composed of?

    <p>Consists of rows of stationary vanes dovetailed into split rings and mounted to the compressor casing.</p> Signup and view all the answers

    What do exit guide vanes do?

    <p>Are stationary vanes with fixed vane angle that straighten the compressor discharge to eliminate turbulence.</p> Signup and view all the answers

    What is the role of the diffuser?

    <p>Forms the compressor rear frame and develops a pressure wall to prevent reverse flow of combustion gases.</p> Signup and view all the answers

    What are the types of compressors? (Select all that apply)

    <p>Single Rotor</p> Signup and view all the answers

    What is the process of compressor air flow?

    <p>Air inlet duct (Intake) &gt; Inlet Guide Vanes &gt; 1st Stage Rotor Blades &gt; 1st Stage Stator Vanes &gt; Repeat &gt; Last Stage of Rotors &gt; Exit Guide Vanes &gt; Diffuser &gt; Combustion Section.</p> Signup and view all the answers

    What is the combustion section?

    <p>Located between the compressor section and turbine section, it burns the fuel/air mixture.</p> Signup and view all the answers

    What are the components of the combustion section?

    <p>Casing, Chamber, Fuel Nozzle, Ignitor Plugs, Fuel Drain.</p> Signup and view all the answers

    What are the two types of combustion chambers?

    <p>Annular (single chamber) and Can-annular (multiple chambers).</p> Signup and view all the answers

    What are ignitor plugs?

    <p>Provides an air gas for the high energy spark to ignite fuel/air mixture.</p> Signup and view all the answers

    What does the fuel nozzle do?

    <p>Two types: Duplex (most widely used due to good spray characteristics) and Simplex (limited use spray pattern).</p> Signup and view all the answers

    What is the fuel drain's purpose?

    <p>Provides a means of draining residual fuel during engine shutdown or after an abnormal start.</p> Signup and view all the answers

    What is the purpose of the turbine section?

    <p>Extracts energy from expanding gases and converts it to shaft horsepower.</p> Signup and view all the answers

    What are turbine section components?

    <p>Casing, Nozzle Assembly, Turbine Rotor Assembly (Rotor Blades).</p> Signup and view all the answers

    What does the nozzle assembly do?

    <p>Converts heat and pressure into velocity energy.</p> Signup and view all the answers

    What is the turbine rotor assembly's purpose?

    <p>Converts velocity energy into mechanical energy to drive the compressor and engine-driven accessories.</p> Signup and view all the answers

    What are the types of turbine rotor blades?

    <p>Impulse (Low Thrust), Reaction (Medium Thrust), Impulse Reaction (High Thrust).</p> Signup and view all the answers

    What is the engine exhaust section?

    <p>Aft of the turbine section, it straightens and directs gases rearward.</p> Signup and view all the answers

    What is the inner cone's function?

    <p>Used to prevent turbulence and allows gases to gradually come together.</p> Signup and view all the answers

    What are struts in the turbine engine?

    <p>Position and hold the inner cone and straighten swirling gases leaving the turbine.</p> Signup and view all the answers

    What is the exhaust nozzle's purpose?

    <p>To impart the final boost in velocity to the gases leaving the exhaust.</p> Signup and view all the answers

    What is the turbine engine accessory section?

    <p>Contains the Power Take Off (PTO) and the Accessory Gearbox.</p> Signup and view all the answers

    Study Notes

    Matter and States of Matter

    • Matter occupies space and can transition between states; composed of elements or compounds.
    • States of matter include solid, liquid, and gas, each with distinct properties.

    Properties of Matter

    • Solid: Has a definite shape and volume.
    • Liquid: Maintains definite volume but adapts its shape based on the container.
    • Gas: Lacks definite shape or volume, filling the available space.

    Basic Measurements

    • Volume: The space an object occupies.
    • Mass: The quantity of matter within an object.
    • Weight: The gravitational force acting on an object.
    • Gravity: The attraction between an object and the Earth, influencing weight.
    • Density: Mass per unit volume, indicating how tightly matter is packed into a space.

    Pressure Concepts

    • Force: The total pressure acting on an object.
    • Pressure: Force exerted over an area (measured in PSI).
    • Types of Pressure: Includes static, impact, relative, and absolute pressures.

    Application of Pressure Principles

    • Pascal's Law: Pressure applied to a confined fluid is transmitted equally in all directions.
    • Bernoulli's Principle: In a fluid stream, increased velocity results in decreased pressure.
    • Divergent Venturi Tube: Increases pressure while decreasing velocity.
    • Convergent Venturi Tube: Increases velocity while decreasing pressure.

    Gas Laws

    • Boyle's Law: For a gas at constant temperature, volume and pressure are inversely related.
    • Charles’ Law: At constant volume, pressure is proportional to absolute temperature, and at constant pressure, volume is proportional to temperature.

    Newton's Laws of Motion

    • First Law (Inertia): An object at rest stays at rest; an object in motion stays in motion unless acted upon by an external force.
    • Second Law (Force and Acceleration): Acceleration is inversely proportional to mass when a constant force is applied (F=ma).
    • Third Law (Interaction): For every action, there is an equal and opposite reaction.

    Heat Transfer and Temperature

    • Heat: Energy produced by molecular motion, measured in British thermal units (BTU) or calories.
    • Methods of Heat Transfer: Includes conduction (direct transfer), convection (currents in fluids), and radiation (transfer via high-speed energy particles).
    • Temperature: A measure of the intensity of hotness or coldness.

    Atmospheric Composition and Layers

    • Atmosphere Composition: 78% nitrogen, 21% oxygen, 1% inert gases.
    • Atmospheric Layers: Troposphere (weather), Stratosphere (best flying conditions), Mesosphere (limited gas turbine operation), Thermosphere (protection layer).

    Machine and Hydraulic Principles

    • Machine Principle: Application of laws to develop machines that assist in work; all machines modify force or speed.
    • Hydraulics: Study of liquid motion; uses principles like Pascal's Law to transmit pressure in confined fluids and to move components effectively.

    Hydromechanical System Components

    • Reservoir: Stores fluid.
    • Filter: Removes contamination.
    • Pump: Facilitates fluid flow.
    • Pressure Relief Valve: Manages system pressure.
    • Selector Valve: Directs fluid flow.
    • Actuating Unit: Converts fluid pressure to mechanical work.
    • Tubing: Conducts fluid.
    • Check Valve: Allows unidirectional flow.

    Contamination in Hydraulics

    • Major maintenance hazard; contamination can originate from within the system or external sources.
    • Control measures include maintaining filters and minimizing contamination during maintenance.

    Mechanical Power Concepts

    • Power: Rate at which work is done or energy is expended.
    • Motion: Change in place or position.
    • Velocity: Rate of distance change with respect to time.
    • Acceleration: Rate of change of velocity.

    Jet Propulsion and Thrust

    • Jet Propulsion: Force generated in the opposite direction of gas flow escaping through a nozzle.
    • Thrust Classification: Includes static thrust (no forward motion) and net thrust (effective power during flight).

    Brayton Cycle in Gas Turbines

    • The thermodynamic cycle of a gas turbine engine includes four continuous events: intake, compression, combustion, and exhaust.

    Gas Turbine Engine Sections

    • Compressor Section: Compress air for combustion.
    • Combustion Section: Mixes air with fuel and ignites it to produce energy.
    • Turbine Section: Converts energy from combustion gases into mechanical energy to drive the compressor and accessories.
    • Exhaust Section: Straightens and directs gases out of the engine.

    Turbine Engine Components

    • Each section has distinct components, such as casing, rotor assemblies, nozzle assemblies, and exhaust nozzles.

    Engine Exhaust Dynamics

    • Inner Cone: Maintains gas flow stability in the exhaust duct.
    • Exhaust Nozzle: Enhances gas velocity and directs flow, available in fixed and variable area designs.

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    Test your knowledge on fundamental concepts of matter and its various states with this flashcard quiz. Perfect for students in Navy Aviation Machinist Mate A School. Dive into definitions and learn essential vocabulary to excel in your studies.

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