AS311 exam 2

45 flashcards · Other · by macauley dsouza

1. You see an OIL FILTER BYPASS alert on the electronic flight display. What is the most likely cause of this alert? A) High oil temperature B) Clogged oil filter C) Low oil viscosity D) Magnetic chip detector

   B) Clogged oil filter

2. How are thrust reverser systems actuated? A) Only electrically B) Only pneumatically C) Pneumatically or hydraulically D) Only hydraulically

   C) Pneumatically or hydraulically

3. Why do labyrinth seals allow air movement through the seal? A) Air flow through the seal increases oil oxygenation. B) Air flow is not allowed through a labyrinth seal. C) Air flow through the seal prevents oil from exiting the seal. D) Air flow through the seal helps oil to escape into the scavenge system.

   C) Air flow through the seal prevents oil from exiting the seal.

4. Which oil is most likely thinner? A) Oil A because it has a higher viscosity B) Oil B because it has a lower viscosity C) Oil B because it has a higher viscosity D) Oil A because it has a lower viscosity

   D) Oil A because it has a lower viscosity

5. What noise source is least desirable and travels the farthest distance? A) High-frequency noise. B) Low-frequency noise. C) Noise between 50-80 decibels D) Mid-frequency noise.

   B) Low-frequency noise.

6. What is/are the primary cooling agent(s) used to cool the oil in this engine? A) Only fuel B) Only air C) Air, fuel, and coolant D) Only coolant

   A) Only fuel

7. How does a water injection thrust augmentation system increase thrust? A) Increases mass airflow B) Increases air density in the inlet and/or increases combustor cooling C) Decreases air density in the compressor D) Increases compressor cooling

   B) Increases air density in the inlet and/or increases combustor cooling

8. What is the name and purpose of the white device in the exhaust section of this engine? A) Exhaust cone struts. Change radial airflow into axial airflow. B) Turbine exit vanes. Ensure optimal velocity and angle of exhaust gases in tailpipe. C) Multi-lobe exhaust mixer. Mix airflow from bypass and core airflow to decrease engine noise. D) Divergent nozzle. Increases static pressure in tailpipe.

   C) Multi-lobe exhaust mixer. Mix airflow from bypass and core airflow to decrease engine noise.

9. What is the purpose of the accessory gearbox (AGB) breather in the center of the red circle? A) Provide a bypass valve for excess oil pressure B) Regulate the air pressure in the accessory gearbox C) Provide an outlet into the scavenge system D) Provide an inlet for the oil

   B) Regulate the air pressure in the accessory gearbox

10. What type of thrust augmentation system is visible in the image? A) Exhaust exit guide vanes B) Afterburner C) Alcohol injection D) Water injection

    B) Afterburner

11. What is the name of this component? A) Plain bearing B) Roller bearing C) Carbon seal D) Ball bearing

    B) Roller bearing

12. What conditions might lead to a high oil pressure indication? A) Low oil quantity B) Clogged oil filter or high oil viscosity C) Decreased flow rate due to high oil temperature D) Decreased flow rate due to low oil viscosity

    B) Clogged oil filter or high oil viscosity

13. What is the name and purpose of the radial struts in the center of the exhaust section? A) Exhaust duct stator vanes. Direct airflow out of the turbine section B) Water/alcohol injection rings. Increase air density and mass airflow C) Exhaust exit guide vane. Ensure optimum airflow angle and velocity outside the tailpipe D) Flame holder. Provide optimum fuel-air mixing to increase fuel efficiency

    D) Flame holder. Provide optimum fuel-air mixing to increase fuel efficiency

14. What is (are) the primary source(s) of aircraft noise? A) Only compressor noise and jet blast B) Turbulent airflow, compressor fan, jet blast, landing gear, and flaps C) Only compressor fan D) Only landing gear and flaps

    B) Turbulent airflow, compressor fan, jet blast, landing gear, and flaps

15. Which oil is thinner at low temperatures? A) The viscosities are the same B) Oil A has a lower viscosity C) Oil B has a lower viscosity D) The image does not supply enough information

    B) Oil A has a lower viscosity

16. Which type of bearing allows for the greatest/maximum axial expansion of the engine shaft? A) Bearing C B) Bearing A C) Bearing B D) Bearing B and Bearing C

    B) Bearing A

17. Which component(s) help convert radial exhaust gas motion to axial motion? A) Exhaust cone and support struts. B) Only the support struts. C) Neither the exhaust cone nor the support struts. D) Only the exhaust cone.

    A) Exhaust cone and support struts.

18. What statement is true regarding the lubrication system in these aircraft? A) The Cessna burns more oil per hour because it is a turboprop B) The Hawker burns more oil per hour because it is a turbofan C) Both airplanes have similar rates of oil consumption per hour D) Both airplanes have a higher rate of oil consumption than an aircraft with a reciprocating engine

    C) Both airplanes have similar rates of oil consumption per hour

19. What is true of the exhaust gas velocity in this convergent-divergent exhaust section? A) Velocity decreases and then increases B) Velocity continuously increases C) Velocity increases and then decreases D) Velocity continuously decreases

    B) Velocity continuously increases

20. What is the name (shape) and purpose of this exhaust nozzle? A) Convergent-divergent. Increase exhaust velocity above M 1.0 and decrease static pressure to ambient. B) Variable geometry exhaust. Change into convergent shape during supersonic flight. C) Fixed geometry exhaust. Change into convergent shape during supersonic flight. D) Convergent-divergent. Decrease exhaust velocity to below M 1.0 and increase static pressure above ambient.

    A) Convergent-divergent. Increase exhaust velocity above M 1.0 and decrease static pressure to ambient.

21. What is the name (shape) and purpose of the portion of the tailpipe indicated by the red dot? A) Convergent. Increase exhaust gas velocity to M 1.0 to create a choked nozzle. B) Convergent. Decrease static pressure to ambient to increase propulsive efficiency. C) Divergent. Increase exhaust gas velocity in supersonic aircraft. D) Divergent. Increase static pressure to reduce turbulent exhaust flow.

    D) Divergent. Increase static pressure to reduce turbulent exhaust flow.

22. What type of bearing is Bearing B? A) Plain bearing B) Thrust bearing C) Ball bearing D) Roller bearing

    A) Plain bearing

23. What is the shape and purpose of this tailpipe if the airplane is flying at M 0.91? A) Convergent. Increase exhaust velocity to M 1.0 and create a shockwave at the exhaust nozzle which "chokes" the flow and increases static pressure in the tailpipe. B) Convergent-divergent. Decrease exhaust velocity to below M 1.0 to minimize exhaust shock diamonds and increase net thrust. C) Convergent-divergent. Increase exhaust velocity to greater than M 1.0 which increases net thrust. D) Convergent. Increas…

    A) Convergent. Increase exhaust velocity to M 1.0 and create a shockwave at the exhaust nozzle which "chokes" the flow and increases static pressure in the tailpipe.

24. Which oil is more appropriate for cold-weather operations and why? A) Oil A because it has a higher cold-weather viscosity B) Oil B because it has a lower cold-weather viscosity C) Oil B because it has a higher cold-weather viscosity D) Oil A because it has a lower cold-weather viscosity

    D) Oil A because it has a lower cold-weather viscosity

25. Which type of seal allows the greatest amount of air to pass through? A) Seal A. Carbon seal B) Seal B. Labyrinth sea C) Seal A. Labyrinth seal D) Seal B. Carbon seal

    C) Seal A. Labyrinth seal

26. What statement is true concerning the lubrication systems in these two airplanes? A) The Diamond DA42 engines consume less oil because they are reciprocating engines. B) The Diamond DA42 engines consume more oil because they are reciprocating engines. C) The Hawker 800 engines consume more oil because they are turbine engines. D) The Hawker 800 engines carry less oil because turbine engines always have a lower total oil capacity.

    B) The Diamond DA42 engines consume more oil because they are reciprocating engines.

27. What is the name and purpose of the pictured device? A) Cascade reverser. Redirect cold/bypass airflow B) Mechanical blockage reverser. Redirect cold/bypass airflow C) Mechanical blockage reverser. Redirect core/hot exhaust D) Cascade reverser. Redirect core/hot exhaust

    A) Cascade reverser. Redirect cold/bypass airflow

28. What is the purpose of a choked nozzle in a subsonic airplane? A) Increase the exhaust gas velocity above M 1.0 and decrease exhaust gas pressure below ambient pressure B) Increase the exhaust gas velocity above M 1.0, create shockwaves inside the exhaust cone, and decrease velocity below M 1.0 C) Decrease exhaust gas velocity and increase static pressure to maximize pressure thrust D) Increase the exhaust gas velocity to M 1.0, create a shockwave, and increase exhaust pressure

    D) Increase the exhaust gas velocity to M 1.0, create a shockwave, and increase exhaust pressure

29. What is the name and purpose of the pictured device? A) Mechanical blockage reverser. Redirects cold/bypass airflow B) Mechanical blockage reverser. Mechanically redirects core/hot exhaust C) Cascade reverser. Mechanically re-directs core/hot exhaust D) Cascade reverser. Redirect cold/bypass airflow

    B) Mechanical blockage reverser. Mechanically redirects core/hot exhaust

30. What is the name and purpose of this component? A) Carbon bearing. Support engine shaft loads. B) Carbon seal. Reduce oil and air movement. C) Labyrinth seal. Reduce oil movement while allowing air movement D) Brush seal. Reduce oil movement while allowing air movement.

    C) Labyrinth seal. Reduce oil movement while allowing air movement

31. What is the purpose of the divergent duct between the tail cone and wall of the exhaust pipe? A) Increase velocity in the exhaust gas to help prevent radial airflow after the exhaust exits the turbine section. B) Increases static pressure in the exhaust gas to help prevent radial airflow after the exhaust exits the turbine section. C) Increase velocity in the exhaust gas to maximize pressure thrust. D) Increase static pressure in the exhaust gas to maximize pressure thrust.

    B) Increases static pressure in the exhaust gas to help prevent radial airflow after the exhaust exits the turbine section.

32. How does an afterburner increase thrust? A) Injects and ignites fuel in turbine section B) Increases fuel flow in combustor C) Injects and ignites fuel in exhaust section D) Increases air density in exhaust section

    C) Injects and ignites fuel in exhaust section

33. What is true regarding the lubrication system purpose in these airplanes? A) Airplane B does not use oil for cooling. B) Airplane B does not use oil for cleaning. C) The purpose is the same. D) Airplane A does not oil for sealing.

    C) The purpose is the same.

34. Why are the aft edges of both the bypass shroud and exhaust cowl chevron-shaped? A) Because it looks awesome. B) Increases static pressure in the exhaust gas C) Encourages airstream mixing and reduces engine noise. D) Encourages shockwave formation to decrease exhaust velocity below M 1.0

    C) Encourages airstream mixing and reduces engine noise.

35. What is the name and purpose of the two levers in the yellow circle? A) Piggyback levers. Actuate the thrust reversers by pulling up. B) Throttle levers. Change engine RPM by moving forward or aft. C) Piggyback levers. Actuate the thrust reversers by pushing forward. D) Afterburners levers. Increase thrust by pushing forward.

    A) Piggyback levers. Actuate the thrust reversers by pulling up.

36. What is the name and purpose of this engine exhaust feature? A) Turbine exit guide vanes. Optimize airflow direction and velocity in the tailpipe. B) Engine nacelle chevron. Mix airflow from bypass and core air to decrease engine noise. C) Afterburner. Increase thrust. D) Multi-lobe exhaust mixer. Mix airflow from bypass and core airflow to decrease engine noise.

    D) Multi-lobe exhaust mixer. Mix airflow from bypass and core airflow to decrease engine noise.

37. Which type of bearing allows for the least axial expansion of the engine shaft? A) Bearing A...ball bearing B) Bearing A...roller bearing C) Bearing B...roller bearing D) Bearing B...ball bearing

    A) Bearing A...ball bearing

38. What is the name of the system that returns oil to the tank from locations such as the bearings and gearbox? A) Vent system B) Bypass valve C) Scavenge system D) Boost pump

    C) Scavenge system

39. What type of pump is Pump B? A) Gerotor pump B) Gear pump C) Gear-rotor pump D) Rotary vane pump

    B) Gear pump

40. What is the purpose of the struts that radiate outward from the exhaust cone? A) Convert radial exhaust gas motion into axial motion. B) Decrease exhaust gas velocity C) Increase exhaust gas velocity D) Convert axial exhaust gas motion into radial motion

    A) Convert radial exhaust gas motion into axial motion.

41. Which statement is true regarding these two seals? A) Both seals allow airflow through the seal B) Only Seal A allows airflow through the seal C) Neither seal allows airflow through the seal D) Only Seal B allows airflow through the seal

    A) Both seals allow airflow through the seal

42. Which oil is better suited for high-temperature operations and why? A) Oil B because it has a higher viscosity B) Oil A because it has a lower viscosity C) Oil A because it has a higher viscosity D) Oil B because it has a lower viscosity

    C) Oil A because it has a higher viscosity

43. Which aircraft is most likely to have a divergent exhaust pipe? A) All of these aircraft have a convergent exhaust pipe B) Augusta Westland 139 C) Pilatus PC24 D) Cessna Caravan

    B) Augusta Westland 139

44. During maneuvering, gyroscopic precession of the compressor fan creates a force that is perpendicular to the engine shaft. What is that force called? A) Radial force B) Compression force C) Axial force D) Expansion force

    A) Radial force

45. What is the general name and purpose of these three components? A) Seal. Allow oil flow between engine components B) Bearing. Absorb and transfer engine loads, allow engine shaft expansion, and support rotating shafts C) Bearing. Cause the engine shaft to rotate. D) Seal. Prevent oil flow between engine components

    B) Bearing. Absorb and transfer engine loads, allow engine shaft expansion, and support rotating shafts