AS 311 - Final Exam Preparation

213 flashcards · Other · by Nicholas Enoul

1. Who developed the first turbojet engine and the engine that eventually flew in this airplane? A. Sanford Moss B. Frank Whittle C. Giovanni Branca D. HansVon Ohain

   B. Frank Whittle

2. What type of engine is present in this aircraft? A. Turbojet or turbofan B. Turboshaft C. Auxiliary power unit D. Turboprop

   B. Turboshaft

3. What is the historical significance o f this plane? A. First commercial transport using a turbojet engine B. First turbocharged propeller airplane C. First commercial transport using a turbine-powered engine D. First British airplane to use a turbine-powered engine

   C. First commercial transport using a turbine-powered engine Note: This airplane is called the Vickers Viscount, and it was a turboprop. Remember, a turboprop is also a turbine engine. It made its first commercial transport flight in 1948.

4. Why does the Pilatus PC12 have a divergent inlet duct? A. It increases airflow velocity and decreases static pressure. B. It decreases airflow velocity and decreases static pressure. C. Divergent inlet ducts are not used in turboprop engine inlets. D. It decreases airflow velocity and increases static pressure.

   D. It decreases airflow velocity and increases static pressure.

5. What is active clearance control? A. Altering the turbine RPM to ensure proper clearance between the turbine blade tips and the turbine case B. Heating the turbine case to increase the gap between the turbine blade tips and the turbine case C. Cooling the turbine blades to ensure proper clearance between the turbine blade tips and the turbine case D. Cooling the turbine case to ensure proper clearance between the turbine blade tips and the case

   D. Cooling the turbine case to ensure proper clearance between the turbine blade tips and the case

6. The Engine Alliance GP7200 turbofan is a dual-spool engine. What is the name of the component inside the yellow circle? A. N1 compressor B. N1 turbine C. N2 compressor D. N2 turbine

   C. N2 compressor

7. What type of combustor is shown in this picture? A. Cannular B. Annular C. Can D. Can-annular

   C. Can ---- Notes ---- This is what a Cannular/Can-annular design looks like: Annular:

8. What type of engine is present in this Talos missile? A. Ramjet B. Turbojet C. Pulsejet D. Rocket

   A. Ramjet ---- Note ----- The critical thing to look for is that nose cone or inlet cone. It seems to have ducting that leads straight into the pumps and fuel injectors with no turbines inside. It can't be a rocket though since it uses the ram air generated by the inlet cone to oxidize the fuel.

9. Why does the Pratt & Whitney J58 engine have a lower specific impulse than the GE CF6 engine? A. High thrust always leads to low specific impulse B. High thrust to fuel consumption ratio C. Low fuel consumption to thrust ratio D. Low thrust to fuel consumption ratio

   D. Low thrust to fuel consumption ratio

10. Which statement is true regarding propulsive efficiency at 400 mph (approximately M 0.6)? A. The turboprop creates the most thrust B. The turbojet creates the highest aircraft speed C. The turboprop is the most efficient engine D. The high-bypass turbofan is the most efficient

    C. The turboprop is the most efficient engine

11. What is the name of the blades on the inside of this compressor case and what is the direction of airflow? A. Rotor blades. Air flows from left to right. B. Stator vanes or inlet guide vanes. Air flows from left to right. C. Variable rotor vanes. Air flows from right to left. D. Stator vanes. Air flows from right to left.

    B. Stator vanes or inlet guide vanes. Air flows from left to right. ---- Note ---- The thing to look for is the direction in which these blades are going. The primary thing that shows this is how the blades get smaller as they go left to right.

12. The Boeing B-29 Superfortress had four Wright R-3350 supercharged radial engines. Who developed the first supercharger? A. Sanford Moss B. Hans Von Ohain C. Frank Whittle D. Giovanni Branca

    A. Sanford Moss ---- Notes ---- Hans Ohain is known for the first jet-powered aircraft the HE 178 Frank Whittle is best known for the Whittle Engine and it's implementation into the derpy-lookin' E28 Giovanni Branca is best known for the n̶i̶p̶p̶l̶e̶ ̶t̶u̶r̶b̶i̶n̶e̶ Branca's Steam Engine:

13. What is the name and purpose of the component in the center of the yellow circle? A. Double annular combustor. Connects multiple annular combustor chambers. B. Interconnector. Allows flame to propagate to different combustor chambers. C. Air holes. Provide cooling air for combustor. D. Swirl vane. Mix fuel and air.

    D. Swirl vane. Mix fuel and air.

14. What is the name and purpose of the component indicated by the yellow circle near the top of the image? A. Combustor diffuser. Increase static pressure. B. High pressure compressor. Increase static pressure. C. Combustor. Burn fuel and air mixture. D. Inlet guide vane. Provide uniform airflow velocity.

    A. Combustor diffuser. Increase static pressure.

15. Embraer Praetor 600: Max cruise speed: M 0.8 Engine type: Medium bypass turbofan Sukhoi Su57: Max cruise speed: M 2.0 Engine type: Low bypass turbofan QUESTION: Which airplane is most likely to have a variable geometry inlet and why? A. Praetor 600 because it has a medium bypass turbofan. B. Sukhoi Su57 because it has a low-bypass turbofan C. Sukhoi Su57 because it is supersonic. D. Praetor 600 because it is subsonic.

    C. Sukhoi Su57 because it is supersonic.

16. What type of engine is pictured? A. Turbine B. Turboprop C. Reciprocating D. Rotary

    C. Reciprocating

17. What is the name and purpose of the movable door in this picture of a turboprop air inlet? A. Particle (inertial) separator. Protect the compressor from FOD and ice. B. Internal separator. Vary airflow that reaches compressor, thereby altering engine RPM. C. Waste gate. Control engine RPM by controlling engine airflow. D. Variable geometry inlet. Create shockwave to reduce airflow velocity to less than M 1.0

    A. Particle (inertial) separator. Protect the compressor from FOD and ice.

18. How are many accessory gearboxes driven? A. By an electric motor and a high-current diode. B. By a chain affixed to a flywheel. C. By a hydraulic pump and calibrated reduction valve. D. By a radial drive shaft and a bevel gear.

    D. By a radial drive shaft and a bevel gear. ---- Note ---- Remember folks, the only time a bevel gear is ever mentioned is in relation to the accessory gearbox!!!!

19. This engine is a two-shaft turbofan. What is the name of the 14-stage compressor section aft of the compressor fan? A. N2 high pressure compressor B. N1 high pressure compressor C. N1 low pressure compressor D. N2 low pressure compressor

    A. N2 high pressure compressor

20. What conditions lead to the highest propulsive efficiency? A. When the engine extracts all available energy from the fuel B. Exhaust gas velocity equal to aircraft speed C. Exhaust gas velocity greater than aircraft speed D. The highest possible propeller or compressor speed

    B. Exhaust gas velocity equal to aircraft speed ---- Note ----- Definition of Propulsive Eff: "comparison of the engine's propelling exhaust velocity (jet wake or prop wake) versus aircraft speed." Now, I'm not entirely sure why this is the case, but the whole goal of Propulsive Eff is to get as close to 1.0 as possible. Take a look at the formula below: Take this with a big grain of salt, but here's my crazy theory on why this is the case. For it to be greater than 1.0, that would mean that ou…

21. What condition may occur in a turbine engine if you fly above maximum manufacturer altitudes? A. Flameout due to lean mixture. B. Flameout due to turbulent airflow entering the combustor. C. Flameout due to rich mixture. D. Flameout due to excessive combustor back pressure.

    A. Flameout due to lean mixture.

22. The Aerion AS2 is a prototype supersonic business jet. What design features must be present on the engine inlet? A. Variable geometry inlet with a convergent-divergent duct B. Only a convergent duct C. Only a divergent duct D. Convergent-divergent duct

    D. Convergent-divergent duct ---- Note ---- The key thing to remember is that a convergent-divergent duct is an absolutely necessary base requirement for supersonic flight. As seen in the textbook: "All supersonic aircraft require a convergent-divergent inlet duct -- either fixed or variable." (p. 3-4)

23. What is the name and purpose of the component indicated by the blue circle near the top of the image? A. Air inlet. Provide air to compressor at optimum angle, velocity, and pressure. B. Diffuser. Increase static pressure. C. Combustor. Burn fuel and air mixture. D.Inlet guide vane. Provide uniform airflow velocity.

    B. Diffuser. Increase static pressure.

24. What type of engine compresses the incoming airflow without the use of a moving compressor? A. Ramjet B. Turboprop C. Turbojet D. Rocket

    A. Ramjet

25. What is the name and purpose of these components in an accessory gearbox? A. Planetary reduction gear. Changes engine RPM into optimum RPM for each component in the accessory gearbox. B. Staged gear reduction. Increases engine RPM to provide higher RPM for components in the accessory gearbox. C. Radial inflow turbine. Converts gas energy into rotational energy for the accessory gearbox. D. Radial drive shaft and bevel gear. Transfers energy between the engine and the accessory gearbox.

    D. Radial drive shaft and bevel gear. Transfers energy between the engine and the accessory gearbox.

26. Which statement is true? A. Turbofan engines create the most thrust between "A" and "E" B. Reciprocating engines create the most thrust at airspeeds below "A" C. Turbojet engines create more thrust at all airspeeds D. Reciprocating engines create the least thrust at all airspeeds

    B. Reciprocating engines create the most thrust at airspeeds below "A"

27. According to Bernoulli's Principle, how does dynamic pressure (q) change as subsonic airflow passes through this duct from left to right? A. Dynamic pressure does not change B. Dynamic pressure decreases C. Dynamic pressure increases D. Dynamic pressure increases and then decreases

    B. Dynamic pressure decreases

28. ATC instructs you to descend immediately so you abruptly decrease power. What might occur as a result of the rapid power reduction? A. Compressor stall or surge due to insufficient combustor pressure. B. Combustor over-pressure due to excessive compression ratio C. Combustor flameout due to insufficient mass airflow D. Turbine overspeed due to insufficient combustor pressure

    A. Compressor stall or surge due to insufficient combustor pressure.

29. What is the name and purpose of this engine component if the engine RPM is 39,000? A. Flywheel. Engages at high RPM to convert engine RPM into optimum RPM for each component. B. Radial drive shaft. Transfers engine RPM directly to engine components without changing RPM C. Hydraulic drive valve. Converts hydraulic energy into mechanical energy to drive engine components. D. Accessory gearbox. Changes engine RPM into optimum RPM for each component

    D. Accessory gearbox. Changes engine RPM into optimum RPM for each component

30. Which statements are true of this compressor as compared to the other type of turbine engine compressor? A. It is more susceptible to FOD and has a longer spool up time B. It is cheaper and lighter C. It creates more drag and has a higher mass airflow D. It is more expensive and heavier

    B. It is cheaper and lighter

31. Air pressure in this engine's intake during a ground runup (static operations) is... A. Steadily increasing B. Equal to ambient pressure C. Less than ambient pressure D. Greater than ambient pressure

    C. Less than ambient pressure

32. Outside air is directed through the compressor case in a series of ducts. What is the purpose of this cooling air? A. Expands the compressor case to maintain optimum compressor blade tip clearance. B. Shrinks the stator blades to maintain optimum stator blade tip clearance. C. Expands the rotor blades to maintain optimum rotor blade tip clearance. D. Shrinks the compressor case to maintain optimum compressor blade tip clearance.

    D. Shrinks the compressor case to maintain optimum compressor blade tip clearance.

33. An engine has a bypass ratio of 1:1. What type of engine is it? A. Turboprop or turboshaft B.Turbojet C. Turbofan D. All turbine engines have a bypass ratio

    C. Turbofan

34. By what method are turbine blades cooled? A. Bleed air from compressor section. B. Outside air that enters through gaps in turbine case. C. Turbine blades are not cooled because higher temperatures create a more efficient turbine. D. Liquid cooled by coolant and radiator.

    A. Bleed air from compressor section.

35. What is the name and purpose of "C" in the picture? A. N1 compressor. Increases static pressure. B. N1 compressor. Increases airflow velocity and decreases static pressure C. N2 compressor. Increases both dynamic and static pressure to increase total pressure D. N2 compressor. Decreases airflow velocity and increases total pressure (dynamic + static).

    A. N1 compressor. Increases static pressure.

36. In what type of engine is this turbine usually found? A. Small turbofan engines B. This is not a turbine C. Small turboprop or turboshaft engines D. Auxiliary power units

    D. Auxiliary power units

37. How is compressor bleed air used in the turbine section? A. Cooling of both turbine blades and turbine case. B. Heating of turbine blades to maintain optimum blade-tip-clearance. C. Cooling of turbine shaft to minimize friction and mechanical efficiency D. Heating of turbine case to maintain optimum blade-tip-clearance

    A. Cooling of both turbine blades and turbine case.

38. What type of combustor is present in this engine? A. Reverse flow B. Through-flow C. Axial flow D. Mixed flow

    A. Reverse flow

39. What type of compressor(s) does this engine have? A. Reverse flow axial B. Axial and centrifugal C. Axial only D. Centrifugal only

    C. Axial only

40. What is the purpose of active clearance control? A. Maintain maximum distance between turbine blade tips and turbine case B. Ensure that turbine blade tips are always in contact with turbine case C. Provide cooling air to turbine blades D. Maintain optimum distance between turbine blade tips and turbine case

    D. Maintain optimum distance between turbine blade tips and turbine case

41. What condition may occur if you decrease the throttle too quickly on a turbine engine? Why? A. No negative condition will occur. B. Compressor stall or surge due to turbulent compressor airflow. C. Compressor overspeed due to decreased rate of combustion. D. Compressor stall or surge due to insufficient combustor pressure.

    D. Compressor stall or surge due to insufficient combustor pressure.

42. What is the name and primary purpose of the blades in this image? A. Inlet guide vanes. Direct the inlet air onto the stator and rotor blades. B. Rotor blades. Increase the pressure of the inlet air. C. Stator blades. Increase the static pressure and direct the airflow onto the rotor blades. D. Rotor blades. Increase the temperature and velocity of the intake air.

    C. Stator blades. Increase the static pressure and direct the airflow onto the rotor blades.

43. You are flying a turboprop airplane, cruising at FL 230 over KBRL, and are in the clouds (visible moisture). What, if any action should you take considering the following winds/temperatures aloft forecast and the included image? FT 3000 6000 9000 12000 18000 24000 30000 34000 39000 BRL 2721 3124+04 3331-01 3342-06 3363-14 3489-23 840938 841149 841557 A. No action is necessary. B. Open the inertial separator. C. This airplane is not equipped for flight in icing conditions. D. Close the inertial…

    B. Open the inertial separator.

44. This compressor component is machined out of a single piece of metal. What is its name and benefit(s)? A. Blisk. Decreased weight. B. Combustor stator. Optimum airflow to combustor. C. Mixed flow compressor. Increased strength. D. Stator-rotor combination disc. Decreased weight.

    A. Blisk. Decreased weight.

45. What is the propulsive efficiency of a CFM-56 engine given the following conditions: **Write answers as a percent (e.g. 28) but do not include the % symbol** **Round all answers to the nearest whole number** Aircraft speed: 480 knots (nautical miles per hour) Exhaust gas velocity: 1071 ft/s

    86

46. How much thrust (Fp)(lbs) does a Pratt & Whitney PT6 engine produce on a Piper Meridian given the following conditions: Shaft horsepower: 835 Hp Cruise speed: 290 mph Propeller efficiency: 80%

    863.8

47. What is the bypass ratio of this Pratt & Whitney PW300 turbofan engine if 435 lbs/s of air passes through the combustor and turbine while 1958 lbs/s of air passes through the bypass duct? Write only the portion of the ratio that corresponds to the air that passes through the bypass duct**Round answer to the nearest 1/10**

    4.5

48. How much thrust-horsepower (Thp) does a turbojet engine produce given the following conditions: Thrust: 8,350 lbs Speed: 638 mph

    14,206

49. Which oil is better suited for high-temperature operations and why? Oil A (5 centistoke) Oil B (3 centistoke) A. Oil A because it has a higher viscosity B. Oil B because it has a higher viscosity C. Oil A because it has a lower viscosity D. Oil B because it has a lower viscosity

    A. Oil A because it has a higher viscosity

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

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

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

    C. Seal A. Labyrinth seal

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

    A. Pneumatically or hydraulically

53. Why do labyrinth seals allow air movement through the seal? A. Air flow through the seal increases oil oxygenation. B. 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. D. Air flow is not allowed through a labyrinth seal.

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

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

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

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

    D. Mechanical blockage reverser. Mechanically redirects core/hot exhaust ---- Note ---- Remember this rule of thumb and you should be good: Mechanical/clamshell = blocks entire tailpipe Aerodynamic/cascade = blocks only bypass

56. 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. Afterburners levers. Increase thrust by pushing forward. C. Throttle levers. Change engine RPM by moving forward or aft. D. Piggyback levers. Actuate the thrust reversers by pushing forward.

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

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

    D. Cascade reverser. Redirect cold/bypass airflow

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

    D. Clogged oil filter or high oil viscosity

59. What statement is true regarding the lubrication system in these aircraft? Cessna SkyCourier (turboprop) Hawker 800XP A. Both airplanes have similar rates of oil consumption per hour B. The Cessna burns more oil per hour because it is a turboprop C. The Hawker burns more oil per hour because it is a turbofan D. Both airplanes have a higher rate of oil consumption than an aircraft with a reciprocating engine

    A. Both airplanes have similar rates of oil consumption per hour

60. 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 maximize pressure thrust. B. Increase velocity in the exhaust gas to help prevent radial airflow after the exhaust exits the turbine section. C. Increase static pressure in the exhaust gas to maximize pressure thrust. D. Increases static pressure in the exhaust gas to help prevent radial airflow after the exhaust exits the turbine section.

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

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

    B. Injects and ignites fuel in exhaust section

62. What statement is true concerning the lubrication systems in these two airplanes? Hawker 800 Diamond DA42VI A. The Hawker 800 engines consume more oil because they are turbine engines. B. The Diamond DA42 engines consume more oil because they are reciprocating engines. C. The Diamond DA42 engines consume less oil because they are reciprocating 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.

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

    A. The purpose is the same.

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

    B. Roller bearing

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

    C. Bearing A...ball bearing

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

    D. Scavenge system

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

    D. Augusta Westland 139

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

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

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

    C. Afterburner

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

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

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

    D. Labyrinth seal. Reduce oil movement while allowing air movement

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

    A. Clogged oil filter

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

    C. Radial force

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

    C. Turbulent airflow, compressor fan, jet blast, landing gear, and flaps

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

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

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

    A. Velocity continuously increases

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

    C. Only fuel

78. Which oil is most likely thinner? Oil A Oil B A. Oil A because it has a lower 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 higher viscosity

    A. Oil A because it has a lower viscosity

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

    C. Regulate the air pressure in the accessory gearbox

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

    C. Bearing A

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

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

82. What is the purpose of a choked nozzle in a subsonic airplane? A. Increase the exhaust gas velocity above M 1.0, create shockwaves inside the exhaust cone, and decrease velocity below M 1.0 B. Decrease exhaust gas velocity and increase static pressure to maximize pressure thrust C. Increase the exhaust gas velocity to M 1.0, create a shockwave, and increase exhaust pressure D. Increase the exhaust gas velocity above M 1.0 and decrease exhaust gas pressure 8below ambient pressure

    C. Increase the exhaust gas velocity to M 1.0, create a shockwave, and increase exhaust pressure

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

    B. Convert radial exhaust gas motion into axial motion.

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

    A. Gear pump

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

    C. Oil A has a lower viscosity

86. 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. Flame holder. Provide optimum fuel-air mixing to increase fuel efficiency C. Water/alcohol injection rings. Increase air density and mass airflow D. Exhaust exit guide vane. Ensure optimum airflow angle and velocity outside the tailpipe

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

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

    D. Plain bearing

88. What is the shape and purpose of this tailpipe if the airplane is flying at M 0.91? A. Convergent-divergent. Increase exhaust velocity to greater than M 1.0 which increases net thrust. B. Convergent. Increase exhaust velocity to M 1.0 which decreases static pressure to ambient and increases propulsive efficiency. C. 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. D. Convergent-dive…

    C. 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.

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

    B. Encourages airstream mixing and reduces engine noise

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

    A. Exhaust cone and support struts.

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

    D. Low-frequency noise.

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

    D. Both seals allow airflow through the seal

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

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

94. The Cessna 441 Conquest is a turboprop and does not have an APU. What type of starter is the least likely to be used to start these engines? A. Starter-generator B. Ram air turbine starter C. Electric starter D. Pneumatic starter

    D. Pneumatic starter --- Note --- The key word to look for is the "least likely to be used to start these engines?" Even though it doesn't have an APU (and thusly doesn't have an electric starter for said APU), this doesn't matter as the electric starter for the APU doesn't directly start the engines - the APU does! TL;DR DO NOT OVERTHINK THE APU PORTION. As the torque requirement for prop-driven aircraft does not necessitate a pneumatic starter, we can safely say it is very unlikely to have a…

95. To what type(s) of engine(s) do these instruments refer? A. Turbofan B. Turboprop or turboshaft C. Turbofan or turboshaft D. Turbojet

    B. Turboprop or turboshaft

96. When do you expect an anti-stall compressor bleed valve to be open? A. When N2 is increased above a pre-determined value B. When compressor outlet pressure is too high compared to combustor pressure C. When compressor inlet and outlet pressures are equal D. When compressor outlet pressure is lower than inlet pressure

    B. When compressor outlet pressure is too high compared to combustor pressure

97. How are anti-stall bleed valves controlled? A. Anti-stall systems are controlled automatically B. Manually via the bleed valve bypass system C. Automatically via the EICAS D. Manually by moving the ENGINE BLEED control to OPEN/CLOSED

    A. Anti-stall systems are controlled automatically

98. EGT is increasing and N2 is fluctuating. What is most likely happening and what is the appropriate pilot action? A. Compressor stall. Increase engine power B. Compressor stall. Decrease engine power C. Combustor flameout. Increase fuel flow. D. Compressor underspeed. Decrease EPR.

    B. Compressor stall. Decrease engine power

99. What is the purpose of the relief valve on the left side of the image? A. Allow fuel that was unused in the atomizer to return to the fuel tank B. Allow fuel to bypass the filter C. Open when fuel pressure exceeds spring pressure D. Close when fuel pressure exceeds spring pressure

    C. Open when fuel pressure exceeds spring pressure

100. For what type(s) of engine(s) is this the primary power instrument? A. Turbofan only B. Turboprop and turboshaft C. Turbojet only D. Turbofan and turbojet

     B. Turboprop and turboshaft