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Navy Aviation Machinist Mate A School Week 1 Quiz 2024 with complete solution, Exams of Advanced Education

Navy Aviation Machinist Mate A School Week 1 Quiz 2024 with complete solution Matter - ANS - Anything that takes up space. Can change from one state to another. Made up of Elements or Compounds

Typology: Exams

2024/2025

Available from 09/17/2024

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Download Navy Aviation Machinist Mate A School Week 1 Quiz 2024 with complete solution and more Exams Advanced Education in PDF only on Docsity! Navy Aviation Machinist Mate A School Week 1 Quiz 2024 with complete solution Matter - ANS - Anything that takes up space. Can change from one state to another. Made up of Elements or Compounds. states of matter - ANS - solid, liquid, gas Solid - ANS - state of matter with a definite shape and volume liquid - ANS - A state of matter that has a definite volume but no definite shape. Gas - ANS - A state of matter with no definite shape or volume Volume - ANS - the amount of space an object occupies Mass - ANS - the amount of matter in an object Weight - ANS - A measure of the force of gravity acting on an object Gravity - ANS - Force that attracts an object towards the center of the earth Density - ANS - Amount or quantity of mass per unit volume Force - ANS - The total pressure acting upon an object Pressure - ANS - Force per unit area measured in PSI Types of Pressure - ANS - Static Pressure Impact Pressure Relative Pressure Absolute Pressure Static Pressure - ANS - Pressure in a confined space or not causing motion Impact Pressure - ANS - pressure caused by motion Relative Pressure - ANS - One pressure in relation to another Absolute Pressure - ANS - Sum of the Atmospheric Pressure and System pressure starting from a theoretical vacuum Pascal's Law - ANS - Pressure applied to enclosed or confined fluid is transmitted equally in all directions without loss, and acts with equal force on all surfaces. Bernoulli's Principle - ANS - States whenever a stream of any fluid has it's velocity increase at a given point the pressure of the stream at that given point is less than the rest of the stream. Divergent Venturi tube - ANS - Decrease velocity and increase pressure Convergent Venturi tube - ANS - increase velocity and decrease pressure Boyle's Law - ANS - States the volume of a given mass of a gas varies inversely with pressure when temperature is constant Charles' Law - ANS - States if the volume of a confined gas is constant the pressure is directly proportional to the absolute temperature or if the pressure is unchanged the volume is proportional to the temperature Newtons Laws of Motion - ANS - Law of interia Law of Force and Acceleration Law of Interaction Law of Interia - ANS - Newtons first Law States a mass at rest will stay at rest while a mass in motion will stay in motion until acted upon by an outside force. Law of force and acceleration - ANS - Newtons Second Law When a body is acted upon by a constant force the acceleration is inversely proportional to it's mass F=ma Law of Interaction - ANS - Newtons 3rd Law For every action there is an equal and opposite reaction Heat - ANS - Form of energy produced by motion of molecules known as kinetic energy British thermal unit Calorie Methods of heat transfer - ANS - conduction, convection, radiation Conduction - ANS - transfer of heat from molecule to molecule Convection - ANS - transfer of heat by means of currents in a fluid caused by uneven heating (boiling water) Radiation - ANS - Transfer of heat by means of high speed particles of energy Tubing Check Valve Resivoir - ANS - Contains supply of fluid used by the system Filter - ANS - Filters out the contamination Pump - ANS - Creates a flow of fluid Pressure Relief Valve - ANS - Relieves excess system pressure Selector Valve - ANS - Directs the flow of fluid Actuating Unit - ANS - converts fluid pressure to useful work (mechanical motion) Tubing - ANS - Transports the fluid throughout the system Check Valve - ANS - A valve that allows flow in one direction only 2 types of contamination - ANS - Abrasive and Non-abrasive Greatest maintenance hazard for hydraulics - ANS - Contamination Origins of contamination - ANS - 1. 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 Contamination Control - ANS - 1. Ensure filters are maintained according to instruction 2.Hold contamination to a minimal during maintenance SAFETY- Hydromechanical Systems - ANS - 1. Hydromechanical systems operate at extremely high pressure (3,000 psi) 2. A pin-hole leak at these pressures can force the fluid through your skin 3.Never attempt to repair system leaks with the system under pressure. Power - ANS - The rate of doing work or the rate of expanding energy Motion - ANS - The act or process of changing place or position Velocity - ANS - Rate of change of distance with the respect to time in a given direction Acceleration - ANS - Rate if change of velocity Energy - ANS - Ability to do work or bring about changes in matter Intertia - ANS - the property of a body to resist changes to its state of rest or motion jet propulsion - ANS - Propelling force generated in the direction opposite to the flow of gas under pressure which is escaping through an opening called a jet nozzle Standard Day - ANS - 59 degrees Fahrenheit with a barometric pressure of 29.92 inches of mercury. (14.7 psi) 0 humidity and 0 wind velocity The Brayton Cycle - ANS - Name given to the thermodynamic cycle of a gas turbine engine to produce thrust. What are the 4 continuous and constant events in the Brayton Cycle - ANS - Intake, Compression, Combustion and Exhaust Thrust Classification - ANS - Static and Net Thrust Static Thrust - ANS - Thrust produced when the aircraft or engine has no forward motion Net thrust - ANS - Thrust available to power the aircraft in flight Variables Affecting Thrust - ANS - Revolutions Per Minute (RPM) Humidity Outside Air Temperature (OAT) Barometric Pressure Front Frame Section - ANS - Location: Mounted on the front of the compressor Description: Welded steel ring that houses the inlet guide vans (IGVS) Purpose: Recieve air from the air inlet duct and pre-swirl the air (IGVS do this) in the direction of rotation of the engine compressor rotor to prevent shock. 5 Components of the Compressor - ANS - Casing, Rotor Assembly, Stator Assembly, Exit Guide Vanes and the Diffuser Compressor Section - ANS - Location: Between the Front Frame and the Combustion section Purpose: To supply compressed air in sufficient quantities to satisfy the requirements of the combustion section Compressor Casing - ANS - Outer housing for the compressor. Stator Assembly mounted to this. Compressor rotor assembly - ANS - Compressor blades that accelerate the air rearward. Attached by fir tree roots, dovetail or bulb. Locked in by peening, pins, lock wire or keys. Assembly also include the compressor disk and compressor shaft. Stator Assembly - ANS - Consist of rows of stationary vanes dove tailed into split rings and mounted to the compressor casing. Receive air form the preceding stage of rotor blades and then compresses it. Exit Guide Vanes - ANS - Located at the compressor exit Turbine Section Components - ANS - Casing Nozzle Assembly Turbine Rotor Assembly- Rotor Blades Nozzle Assembly - ANS - Located directly aft of the combustion chamber assembly and in front of each preceding stage of turbine rotor blades. Converts heat and pressure into velocity energy Turbine rotor assembly - ANS - Purpose to convert velocity energy into mechanical energy to drive the compressor and engine driven accessories Turbine rotor blade types - ANS - Impulse-Low Thrust Reaction-Medium Thrust Impulse Reaction-High Thrust Engine Exhaust Section - ANS - Aft of the turbine section Purpose to straighten and direct gases rearward convert the gases into a solid jet stream and impart's a final boost in velocity Inner Cone - ANS - Held in place in the center of the exhaust duct. Used to prevent turbulence. Allows gases to gradually come together and form a jet stream. May have small holes for reverse flow to cool turbines Struts - ANS - Located between housing and the inner cone Purpose to position and hold the inner cone and straighten swirling gases leaving the turbine. Exhaust Nozzle - ANS - Location: Attached to the rear flange of the exhaust duct, housing, tailpipe, or the afterburner duct. To impart the final boost in velocity to the gases leaving the exhaust. 2 types Fixed Area and Variable Area Turbine Engine Accessory Section - ANS - Power Take Off (PTO)- Center front of of the compressor hub Accessory Gearbox- Normally located near the bottom of the compressor Purpose to change the rotor speed to suitable speeds and to provide passageways and tubing for lubricating mechanical drive train (gears) Mounting pads for accessories Thrust Augmentation - ANS - Purpose to increase the basic turbojet/turbofan engine thrust to meet takeoff/ flight requirements Water injection system - ANS - Water acts a combustion chamber and turbine coolant, producing a higher thrust for conventional takeoff and vertical shot take-off and landing (VSTOL) Supplies water under pressure to the combustion chamber and turbine engine inlet where it mixes with the airflow to act as a coolant This action increase fuel flow and engine revolutions per minutes producing an increase in thrust without excessive heat. Thrust Nozzle Control System - ANS - The operation of water injection system depends on the throttle position and thrust nozzle control lever position. The ability to vector engine thrust requires coordination of the throttle and the nozzle control lever. Allows water to flow when the throttle position is 96% and 98% RPM. The nozzles can direct engine thrust up to 98.5 degrees. Afterburner - ANS - Turbojet: 75% of exhaust gases are unburned air. Adding fuel and igniting the mixture accelerate the exhaust gases rearward. Additional Thrust Turbofan: Mixing secondary bypass air with primary air increase thrust upon section of the A/B ignition. Thrust increases approximately 50% while fuel flow triples operation in the A/B is limited to only a few minutes.