City and Guilds Level 3 Aeronautical Engineering: Unit 215 Exam Questions And Answers Verified 100% Correct

City and Guilds Level 3 Aeronautical Engineering: Unit 215 Exam Questions And Answers Verified 100% Correct Define a rectangular coordinate system. - ANSWER -A place with perpendicular x and y axes for plotting points. Use trigonometry to find height in a triangle. - ANSWER -h = a sin(theta) Calculate the volume of a cone. - ANSWER -V = 1/3 x pi x r^2 x h What does the gradient of a distance-time graph represent? - ANSWER -Speed Determine the y-intercept from y = 2x + 5 - ANSWER -5 What is the purpose of extrapolating a graph? - ANSWER -To estimate values beyond the measured range. What kind of waveform does a sine graph produce? - ANSWER -A smooth, repetitive curve What is the area under a force-displacement graph? - ANSWER -Work done What does extrapolation mean in graphing? - ANSWER -Estimating values beyond the range of the data set. Define phase difference in sine waves. - ANSWER -The angular displacement between corresponding points of two waveforms. What is an ICAO table used for? - ANSWER -Standard atmosphere values for pressure, temperature, and density vs. altitude. Solve: Find gradient and intercept from y = 3x + 2 - ANSWER -Gradient = 3, y intercept = 2 What is a performance graph? - ANSWER -Graph showing aircraft capabilities (e.g. take-off distance vs. weight) Linear equation: - ANSWER -y = mx + c Gradient equation: - ANSWER -m = (y_2 - y_1)/(x_2 - x_1) y-intercept: - ANSWER -x = 0 x-intercept: - ANSWER -y = 0 What are the three main types of molecular bonds? - ANSWER -Ionic, covalent, metallic State the formula to convert Celsius to Kelvin. - ANSWER -K = C + 273.15 What is latent heat? - ANSWER -Energy required to change state without changing temperatures. Give one example of a conductor and one of an insulator used in aircraft. - ANSWER -Conductor: aluminium; Insulator: plastic What is Brownian motion evidence for? - ANSWER -The kinetic theory of matter What is Brownian motion? - ANSWER -Random motion of particles suspended in a fluid due to collision with molecules. Why does water expand when frozen? - ANSWER -Due to the formation of an open hexagonal crystal structure. State an example of a covalent bond in aircraft materials. - ANSWER -Carbon carbon bonds in composite materials like CFRP. Why is aluminium commonly used in aircraft? - ANSWER -High strength-to weight ratio, corrosion resistance, ductility. Give one application of latent heat in aviation. - ANSWER -De-icing systems (phase change absorbs heat) Specific heat capacity equation: - ANSWER -Q = mcΔT Boyle's Law: - ANSWER -P_1 x V_1 = P_2 x V_2 Charles' Law: - ANSWER -V_1/T_1 = V_2/T_2 Celcius to fahrenheit: - ANSWER -(9/5) x C + 32 What is the moment of a force? - ANSWER -Froce x perpendicular distance from pivot Define equilibrium in a mechanical system. - ANSWER -When all forces and moments are balanced. What is the triangle of forces used for? - ANSWER -To solve equilibrium of three coplanar forces What is the difference between gauge pressure and absolute pressure? - ANSWER -Absolute = gauge + atmospheric; gauge is measured above the atmosphere Formula for pressure in a liquid form? - ANSWER -P = pgh What is a bell crank? - ANSWER -A lever used to change direction of a force or motion, common in aircraft control linkages. Define the parallelogram of forces. - ANSWER -A graphical method to determine the resultant of two concurrent forces.