Assignment 1

Card Set Information

Assignment 1
2013-09-02 08:21:55
Exam test

Show Answers:

  1. What is the profile of a compressor blade?
    A cutout that reduces blade thickness
  2. Which of the following is a reason for proper air entrance (duct) design?
    To increase ram recovery while reducing pressure drops
  3. What is the purpose of compressor blade profiles?
    to allow the compressor blade tips to rub without causing serious damage
  4. Improving primary zone fuel-air mixing (solution)
    Visible smoke elimination (problem
  5. A single air entrance is more advantageous than a dual air entrance system for which of the following reasons?
    It obtains maximum ram pressure
  6. Which of the following is NOT a basic element or system of combustion chambers?
    Air pollution emission reduction
  7. Newton's Second Law?
  8. BA
    Bell Aircraft Company
  9. V?
  10. A standard day at sea level is indicated by what condition?
    20.02 inches of mercury, 0.00% humidity, and a temperature of 59.0 degrees Fahrenheit
  11. Guide vanes change the direction of the air entering and leaving the compressor in what manner?
    By swirling it as it enters and straightening it out as it leaves
  12. Newton's First Law?
  13. Measurement of force times distance
  14. What are two common forms of blade roots?
    Fir-tree and bulb
  15. During supersonic flight, what major aircraft component can NOT withstand supersonic velocity airflow?
    the engine
  16. The thrust developed by a ramjet engine is due to the increase in the air's
  17. What is the primary function of the combustion section?
    To burn the fuel-air mixture
  18. A 10-stage, axial-flow compressor consists of what total number of (a) rotors and (b) stators?
    (a) 10 (b) 10
  19. To calculate the acceleration of a given mass, what symbol representing the force of gravity is normally used?
  20. In the engine designation J79-GE-10, what does the 79 indicate?
    Air Force developed
  21. Which of the following statements is a definition of the term "force"?
    Action on a body that changes its state of motion
  22. Which of the following is NOT considered by engine manufacturers as corrective action for a front-end, low-speed, high-temperature stall?
    Installing a bleed valve(s) the middle of rear portions of the compressor section
  23. Which of the following statements is correct regarding mass and weight
    Mass is the quantity of matter; weight is the pull of gravity on that quantity of matter
  24. What are the three parts of the MIL-STD-879 engine designation system?
    Type indicator, manufacturer's symbol, and model indicator
  25. T
  26. What is the most serious disadvantage of the axial-flow compressor?
    High tendency to stall
  27. Which of the following types of engine does NOT use atmospheric air for combustion?
  28. Approximately what percent of air entering the combustion chamber is mixed with fuel for combustion?
  29. Which of the following is a disadvantage of the axial-flow compressor?
    High starting power needs
  30. English measurement for mechanical power
  31. Which of the following designations indicates an engine sponsored by the Navy?
  32. Which of the following types of fuel nozzles are used in jet engines
    Simplex and duplex
  33. During the combustion process, the emission levels of which of the following pollutants increases as the temperature increases?
    Nitric Oxide
  34. Which of the following is NOT basic type of combustion chamber?
  35. What happens to a slug of air as the temperature increases
    The molecules move faster, run into each other with more impact, and move further apart, decreasing air density
  36. What is the MIL-STD-879 manufacturer's letter symbol for Allison Division, General Motors Corporation?
  37. With reference to the axial-flow engine, the angle of attack is the angle at which the airflow
    Strikes the rotor blades
  38. Increasing fuel atomization (solution)
    (problem) Carbon monoxide emission
  39. Approximately what percentage of air entering the combustion chamber serves as flame control/
  40. Newton's Third Law?
  41. In an axial-flow engine, by what means is high-velocity, low-pressure air converted to low-velocity, high-pressure air?
    Action of stator blades at each stage of compression
  42. By which of the following methods do Navy aircraft diffuse intake air during supersonic flight?By varying the area of the intake duct?By using geometrically variable intake ducts?By creating a shock wave in the intake duct?
    All of the above
  43. What three engine operating parameters cause the airflow angle of attack to vary?
    Engine rpm, compressor-inlet temperature, and compressor discharge pressure
  44. What is the primary function of the compressor?
    To suppy air to the combustion chamber iin the proper
  45. What is the advantage of a dual-entry centrifugal compressor as compared to a single-entry centrifugal compressor?
    It can be made with a smaller diameter and handle the same airflow
  46. F
  47. An engine exerting 1,375 pounds of force moves a vehicle 13.5 feet in 20 seconds. What total amount of work was accomplished?
    18,562.5 foot-pounds
  48. J
  49. What is the ram effect?
    More air arriving at the engine intake than the engine can ingest
  50. What effect does a divergent duct have on airflow?
    An increase in pressure and a decrease in velocity
  51. Engine "choking" refers to which of the following terms?
    Stall due to an excess volume of air in the rear of the compressor
  52. Which of the following groups of jet engines will you, as an AD, be associated with most?
    Turbofan, turbojet, turboprop, and turboshaft
  53. What total number of engine designation systems are presently in use?
  54. AC
    Allison Chalmers
  55. In the formula F=MxA, which of the following is a measurement unit for M (mass)?
  56. Presently, what total number of combustion liners are used in jet engines using can-type combustion chambers?
    8 or 10
  57. Rate of doing work
  58. Capacity for doing work
  59. Which of the following engines has NOT completed the 150-hour qualification test?
  60. An Army-sponsored engine begins with what model number?
  61. Bleed air for unloading the compressor during starting, cockpit pressurization and heating, engine anti-icing, fuel tank pressurization, and various other purposes is tapped from from which of the following sources?
    Different stages of the compressor, depending on the pressure and temperature needed
  62. Which of the following is NOT a problem caused by the use of dual intakes on single-engine aircraft?
    More expensive construction materials
  63. Which of the following types of compressors provides greater starting flexibility and improved high-altitude performance?
    Split-spool, axial-flow