TECHGEN-SB-POWERPLANT-MODULE2-TEST&LEARN

1. The reason for having a low pressure fuel-cooled oil cooler in a recirculatory type oil system is to:




2. The fan in a high by-pass ratio turbo-jet engine produces:





3. Prolonged running at low rpm can have an adverse effect on the functioning of the:





4. The reading on the oil pressure gauge is the:





5. For a turbine engine, the term self-sustaining speed relates to the speed at which the engine:





6. If air is tapped from a gas turbine HP compressor (engine N2 controlled), the effect on the engine pressure ratio (EPR) and the exhaust gas temperature (EGT) is that:





7. A modern Auxiliary Power Unit (APU) is designed to provide power for ground starting of an engine. It also supplies both in the air (subject to certification limitations) and on the ground:





8. Which one of the following factors would be most likely to increase the possibility of detonation occurring within a piston engine?





9. The first indication of carburettor icing in airplanes equipped with constant speed propellers would most likely be a:





10. If the engine, with a fixed pitch propeller, is detonating during climb-out after takeoff, the normal corrective action would be to:





11. An aircraft magneto is switched off by





12. If an engine fails to stop with the magneto switch in OFF position, the cause may be:





13. Aircraft magneto`s receive electrical energy from





14. The lubricating system of an aircraft engine is used to





15. The disadvantages of axial flow compressors compared to centrifugal flow compressors are:
1 - more expensive to manufacture
2 - lower airflow
3 - greater vulnerability to foreign object damage
4 - lower pressure ratio
The combination which regroups all of the correct answers is:





16. The blade angle of a propeller is the angle between the:





17. The richness of a fuel/air mixture ratio is the:





18. With a piston engine, when detonation is recognised, you:





19. The diffuser in a centrifugal compressor is a device in which the:





20. A |fan| stage of a ducted-fan turbine engine is driven by:





21. In a free turbine engine:





22. At constant fuel flow, if engine compressor air is bled off for engine anti-icing or a similar system, the turbine temperature:





23. A |hung start| is the failure of an engine to accelerate to its normal idle speed. It may be caused by:





24. A reverse thrust door warning light on the flight deck instrument panel illuminates when:





25. The compression ratio of a piston engine is the ratio of the:





26. The purpose of the venturi in a carburettor is to:





27. The mixture control for a carburettor achieves its control by:





28. The purpose of a distributor in an ignition system is to distribute:





29. The very rapid magnetic field changes (flux) around the primary coil in a magneto are accomplished by the:





30. A turbocharger system is normally driven by:





31. A turbocharger consists of a:





32. In a single spool gas turbine engine, the compressor rpm is:





33. When the combustion gases pass through a turbine the:





34. The primary reason for a limitation being imposed on the temperature of gas flow is to:





35. In a gas turbine engine, compressor blades, which are not rigidly fixed in position when the engine is stationary, take up a rigid position when the engine is running due to:





36. The purpose of a variable bypass valve, fitted between the LP and HP compressor of an axial flow compressor, is to:





37. Turbine blade stages may be classed as either |impulse| or |reaction|. In an impulse turbine stage:





38. With respect to a piston engine aircraft, ice in the carburettor:





39. The part of a piston engine that transforms reciprocating movement into rotary motion is termed the:





40. In a piston engine if the ratio of air to fuel, by weight, is approximately 9:1, the mixture is said to be:





41. To ensure that the fuel flow is kept directly proportional to the mass of air flowing through the choke, thus preventing the main jet supplying excessive fuel as engine speed is increased, a carburettor is fitted with:





42. The oil system for a piston engine incorporates an oil cooler that is fitted:





43. When leaning the mixture for the most economic cruise fuel flow, excessive leaning will cause:





44. What will eventually happen during a continuous climb with a mixture setting full rich?





45. With an aircraft fitted with a fixed pitch propeller, during flight at normal cruising speed, one magneto fails completely. This will first cause:





46. The use of too low an octane fuel may cause:





47. The cylinder head and oil temperature gauges are to exceed the normal operating ranges if a pilot





48. As the flight altitude increases, if no leaning is made with the mixture control:





49. When starting an engine or when the engine runs at an idle rpm on ground, the mixture is:





50. The application of carburettor heat reduces





51. An impulse coupling does not function at such speeds above those encountered in starting. Its engaging pawls are prevented from operating at higher speeds by





52. Spark timing is related to engine speed in the way that the:





53. An impulse magneto coupling





54. If the ground wire between the magneto and the ignition switch becomes disconnected, the most noticeable result will be that the engine





55. An impulse coupling is installed on a magneto of a piston engine to:





56. Cooling air for a reciprocating engine can be obtained by means of:





57. A chip detector in the oil system of an engine/gearbox is to indicate that





58. Vents in oil tanks are primarily to





59. A pressure relief valve that does not fit on its seat properly would result in





60. A magnetic plug can be used to





61. A stage in an axial compressor:





62. For a fan jet engine, the by-pass ratio is the:





63. In very cold weather, the pilot notices during startup, a slightly higher than normal engine oil pressure. This higher pressure:





64. In a turbo-jet, the purpose of the turbine is to ...





65. If, when the magneto selector switch is set to the OFF position, a piston engine continues to run normally, the most probable cause is that:





66. From the cruise, with all the parameters correctly set, if the altitude is reduced, to maintain the same mixture the fuel flow should:





67. On a normally aspirated engine (non turbo-charged), the manifold pressure gauge always indicates…





68. Using compressor bleed air to power systems:





69. A piston engine may use a fuel of a different grade than the recommended:





70. During a power change on an engine equipped with a constant speed propeller, a wrong combination of manifold pressure and RPM values results in excessive pressures in the cylinders. This is the case when one simultaneously selects a ...





71. The control of free turbine engines on turboprops, is accomplished by:-a propeller control lever used to select:
1 - propeller RPM
2 - turbine temperature
3 - turbine RPM-a fuel control lever used to select:
4 - propeller RPM
5 – torque
6 - turbine temperature
The combination which regroups all of the correct statements is:





72. The static thrust of a turbo-jet, at the selection of full power:
1. equals the product of the exhaust gas mass flow and the exhaust gas velocity
2. is obtained by pressure of the exhaust gas on the ambient air
3. produces zero mechanical power since the aeroplane is not moving
4. is independent of the outside air temperature
The combination which regroups all of the correct statements is:





73. The main reason for opening the cowl flaps is to control the:





74. When in flight, a piston engine is stopped and the propeller blade angle is near 90°, the propeller is said to be:





75. The use of igniters is necessary or recommended on a turbo-jet:
1. throughout the operating range of the engine
2. for accelerations
3. for ground starts
4. for in-flight relights
5. during turbulence in flight
6. under heavy precipitation or in icing conditions
The combination which regroups all of the correct statements is:





76. The thermal efficiency of a piston engine is about:





77. Spark plug fouling is more likely to happen if:





78. |Vapour lock| is the phenomenon by which:





79. In a piston engine, magnetos are used to produce the spark which ignites the fuel/air mixture. The operating principle of magnetos consists in:





80. For a piston engine, the chemically correct fuel/air ratio of the mixture is:





81. (For this question use annex 021-11507A-available as file attachment in course)On the attached diagram showing the power output of a piston engine as a function of mixture richness, best economy is at the point marked:




82. (For this question use annex 021-11474A-available as file attachment in course) The gas turbine illustrated is of the following type:




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