M-15 Gas Turbine Engine Final Practice Test [92 Question and 115 Minutes]

Module 15 : Gas Turbine Engine

Final Practice Test

  

 

1. A jet engine derives its thrust by ?
   1.   reaction of the propelling gases
   2.   impingement of the propelling gases on the outside air
   3.   drawing air into the compressor
2. The working fluid of a gas turbine engine is ?
   1.   kerosene
   2.   air
   3.   gasoline
3. In a twin spool compressor system, the first stage turbine drives the ?
   1.   N1 and N2 compressors
   2.   N2 compressor
   3.   N1 compressor
4. The term Pt7 means ?
   1.   the total pressure at station No. 7
   2.   the total inlet pressure
   3.   pressure and temperature at station No. 7
5. The pressure of supersonic air as it flows through a divergent nozzle?
   1.   is inversely proportional to the temperature
   2.   increases
   3.   decreases
6. A gas turbine engine comprises which three main sections?
   1.   Compressor, diffuser, and stator
   2.   Turbine, compressor, and combustion
   3.   Turbine, combustion, and stator
7. In what section of a turbojet engine is the jet nozzle located ?
   1.   Turbine
   2.   Exhaust
   3.   Combustion
8. The Brayton cycle is known as the constant ?
   1.   mass cycle
   2.   pressure cycle
   3.   temperature cycle
9. Standard sea level pressure is ?
   1.   29.00 inches Hg
   2.   29.29 inches Hg
   3.   29.92 inches Hg
10. A turboprop engine derives its thrust by ?
    1.   reaction of the prop-wash
    2.   reaction of the propulsion gases
    3.   impingement of the prop-wash on the outside air
11. Adiabatic compression is ?
    1.   one where there is no loss or gain of heat
    2.   one where there is an increase in kinetic energy
    3.   an isothermal process
12. In a ducted fan engine, the fan is driven by the ?
    1.   air passing over the compressor
    2.   turbine
    3.   accessory gearbox
13. On a gas turbine engine, what is the fan driven by?
    1.   I P turbine
    2.   H P turbine
    3.   LP turbine
14. The density of gas may be expressed as ?
    1.   volume/weight
    2.   pressure/volume
    3.   weight/volume
15. A divergent duct will cause subsonic flow to decrease in ?
    1.   velocity, pressure remains constant
    2.   velocity, increase pressure
    3.   pressure, increase velocity
16. The purpose of a diffuser is to ?
    1.   induce a swirl to the air prior to combustion
    2.   increase the static pressure of the air
    3.   increase the kinetic energy of the air
17. On a triple spool engine, the first stage of turbines drive ?
    1.   the LP compressor
    2.   the I P compressor
    3.   the HP compressor
18. What type of oil is used in a gas turbine engine?
    1.   Phosphate Ester
    2.   Synthetic
    3.   Mineral
19. The hottest casing is the ?
    1.   combustion chamber
    2.   L.PT
    3.   H.PT
20. Oil pressure and scavenge pumps are usually ?
    1.   multi-plunger pumps
    2.   spur gear pumps
    3.   diaphragm pumps
21. After placing an engine into storage, details would be recorded in ?
    1.   Engine log book
    2.   Technical Log
    3.   Aircraft log book
22. Installed engines must be re-preserved after preservation at least every ?
    1.   six weeks
    2.   six days
    3.   six months
23. What would be indicative of a hung start?
    1.   High E.G.T
    2.   Engine would fail to reach self sustaining speed
    3.   Starter would fail to disengage
24. A rotation pad on an accessory drive gear box is provided for ?
    1.   N2 rotation
    2.   Alternate tachogenerator fitment
    3.   F1 rotation
25. During start, if a bleed valve is stuck closed ?
    1.   E.G.T is unaffected
    2.   E.G.T will be higher than normal
    3.   E.G.T will be lower than normal
26. Galling is a condition caused by excessive?
    1.   scoring
    2.   chafing
    3.   temperatures
27. If a compressor surge occurs, it is recognized by ?
    1.   coughing in the compressor and vibration
    2.   fluctuating RPM and fuel flow
    3.   fluctuating E.G.T and thrust
28. A hot start refers to?
    1.   too much fuel being supplied
    2.   early ignition
    3.   high E.G.T before idle RPM is achieved
29. What may be an indication of a bleed valve stuck in the closed position?
    1.   Compressor stalling at low RPM
    2.   Low E.G.T reading
    3.   Over speed
30. Engine oil sampling analysis is taken?
    1.   after engine shut down
    2.   when oil level is high
    3.   at specific time after engine shut down
31. Methyl Bromide fire extinguisher are installed with neck ?
    1.   at the bottom
    2.   at the top
    3.   horizontal
32. The most satisfactory extinguishing agent for an electrical fire is?
    1.   carbon tetrachloride
    2.   methyl bromide
    3.   carbon dioxide
33. A continuous loop fire detector is what type of detector?
    1.   Overheat detector
    2.   Spot detector
    3.   Rate of temperature rise detector
34. How is the fire extinguishing agent distributed in the engine section ?
    1.   Nitrogen pressure and slinger rings
    2.   Spray nozzles and fluid pumps
    3.   Spray nozzles and perforated tubing
35. A fuel or oil fire is defined as a ?
    1.   class C fire
    2.   class B fire
    3.   class A fire
36. Forward engine mounts take which loads ?
    1.   Thrust, vertical and shear loads
    2.   Centrifugal, thrust and axial
    3.   Thrust, vertical and impact
37. Auxiliary power units provide?
    1.   pneumatic and electrical power
    2.   hydraulic and pneumatic power
    3.   hydraulic and electrical power
38. An A.P.U is?
    1.   a self contained variable speed gas turbine engine
    2.   a reserved engine in case of a main engine failure
    3.   a self contained constant speed gas turbine engine
39. On a twin spool turbo-shaft engine, the free turbine is connected to the ?
    1.   L.P gearbox
    2.   Output gearbox
    3.   H.P gearbox
40. What type of reduction gear is used on most turboprop modern engines ?
    1.   Helical cut parallel spur gears
    2.   Straight cut parallel spur gears
    3.   Epicyclic reduction gear
41. Fuel trimming on a turboprop engine is?
    1.   governor controlled
    2.   automatic
    3.   pilot controlled
42. Water or water/methanol injected into the combustion chamber inlet increases?
    1.   combustion chamber outlet temperatures
    2.   mass airflow through the turbine
    3.   fuel to air ratio by up to 20%
43. Water methanol injection will increase thrust by up to?
    1.   70%
    2.   50%
    3.   30%
44. Integrating fuel flow gives ?
    1.   total fuel consumed
    2.   fuel flow and acceleration
    3.   average fuel flow
45. E.G.T thermocouples are usually made of?
    1.   chromel and platinum
    2.   chromel and alumel
    3.   nickel and platinum
46. A thermocouple indicator is basically a ?
    1.   milliohmeter
    2.   milliammeter
    3.   millivoltmeter
47. Where is Turbine Outlet Temperature (T.O.T) measured?
    1.   Downstream of the turbine
    2.   Upstream of the turbine
    3.   In the combustion chamber
48. oil temperature thermocouples are usually constructed of ?
    1.   alumel constantan
    2.   iron constantan
    3.   chromel alumel
49. What power is required for E.G.T gauge indication?
    1.   115V AC
    2.   28V DC
    3.   No power - it is self generating
50. Fuel flow indication is taken from ?
    1.   after the LP pump
    2.   after the H.P pump
    3.   after either H.P Pump or LP Pump
51. The resistor in a D.C. starter motor?
    1.   prevents over speed
    2.   prevents current surge when motor is at low rpm
    3.   used when D.C. motor fails
52. An aircraft flying through heavy rain may use, as a precaution?
    1.   continuous ignition
    2.   engine intake deicing
    3.   airframe deicing
53. The field of the D.C. starter motor used on gas turbine engine is ?
    1.   shunt or compound
    2.   series or compound
    3.   series only
54. The type of ignition system used on most turbine aircraft engines is?
    1.   low tension
    2.   capacitor discharge
    3.   high resistance
55. What type of turbine blade is most commonly used in air starter motors?
    1.   Impulse-reaction
    2.   Reaction
    3.   Impulse
56. As air is bled off the engine, EGT will?
    1.   increase
    2.   decrease
    3.   remain constant
57. Turbine case cooling utilizes?
    1.   LP compressor air
    2.   Fan air
    3.   HP compressor air
58. Engine anti-ice is taken AIR from the ?
    1.   Turbine
    2.   LP compressor
    3.   HP compressor
59. When does E.E.C channel change over occur?
    1.   On fault
    2.   On engine shut down
    3.   On engine start up
60. Fuel boost pumps are cooled using?
    1.   Fuel pumps do not require cooling
    2.   Fuel
    3.   Ram air
61. When FADEC is in normal mode ?
    1.   channel A or B will be in command
    2.   channel A will be in command
    3.   channel B will be in command
62. In-Flight the engine E.E.C controls ?
    1.   EGT
    2.   Throttle position
    3.   Fuel flow
63. Which of the following turbine fuel filters has the greatest filtering action?
    1.   Small wire mesh
    2.   Micron
    3.   Stacked charcoal
64. The swash plate in a fuel pump, when static is?
    1.   at some intermediate position
    2.   in the minimum position
    3.   in the maximum position
65. A fuel heater prevents?
    1.   HP filter icing
    2.   LP filter icing
    3.   Neither
66. The fuel pump plungers are lubricated by?
    1.   synthetic anti-freeze oil
    2.   grease packed bearings
    3.   the Fuel
67. Specific fuel consumption at altitude will?
    1.   decrease
    2.   remain constant
    3.   increase
68. A spur gear pump operating in a lubrication system promotes?
    1.   low flow at high pressure
    2.   low flow at low pressure
    3.   high flow at low pressure
69. A full flow oil system has?
    1.   a hot and cold oil pressure limit
    2.   a variable oil pressure dependant upon throttle setting
    3.   a single fixed minimum oil pressure
70. What type of oil system is usually found on turbine engines?
    1.   Dry sump, dip, and splash
    2.   Wet sump, spray, and splash
    3.   Dry sump, pressure, and spray
71. Which of the following is a function of the fuel oil heat exchanger on a turbojet engine?
    1.   Increases fuel temperature
    2.   Aerates the fuel
    3.   Emulsifies the oil
72. Calorific value is the?
    1.   vaporisation point of fuel
    2.   amount of heat or energy in one pound of fuel
    3.   fuel boiling temperature
73. A fuel system icing inhibitor is a fuel additive which?
    1.   prevents the water in the fuel freezing
    2.   prevents the fuel from freezing
    3.   prevents both the water and the fuel freezing
74. Kerosene will burn effectively at an air/fuel ratio of ?
    1.   45:1
    2.   150:1
    3.   15:1
75. Taper roller bearings accept loads in which direction ?
    1.   Radial and axial in both directions
    2.   Radial and axial in one direction only
    3.   Axial loads only
76. Indentations on bearing races caused by high static loads are known as ?
    1.   brinelling
    2.   galling
    3.   fretting
77. A carbon seal has which type of sealing arrangement ?
    1.   Full contact with casing
    2.   Full contact with race
    3.   Full contact with labyrinth
78. On a Clamshell door type thrust reverser, The Clamshell doors redirect the exhaust gas stream?
    1.   45 degrees to the thrust line
    2.   90 degrees to the thrust line
    3.   0 degrees to the thrust line
79. A convergent exhaust nozzle produces mainly ?
    1.   momentum and pressure thrust
    2.   momentum thrust
    3.   pressure thrust
80. Exhaust noise can be reduced by ?
    1.   lowering the vibration frequency
    2.   increasing the jet velocity
    3.   increasing the mixing rate
81. A Convergent-Divergent nozzle ?
    1.   requires the aircraft to be travelling at supersonic speeds
    2.   makes maximum use of Pressure thrust
    3.   produces a type of thrust known as kinetic thrust
82. A choked nozzle ?
    1.   has no effect on the thrust
    2.   increases thrust
    3.   decreases thrust
83. A slow constant growth in a turbine blade is known as?
    1.   primary creep
    2.   secondary creep
    3.   tertiary creep
84. Turbine engine components are never manufactured by ?
    1.   electrical resistance welding
    2.   argon arc welding
    3.   gas welding
85. What are blue and golden deposits evidence of, on a turbine blade ?
    1.   Titanium
    2.   Aluminium
    3.   Magnesium
86. An increase in turbine diameter is caused by ?
    1.   prolonged high temperatures and centrifugal loads
    2.   products of combustion
    3.   over speed
87. Creep, overall ?
    1.   has no effect on turbine diameter
    2.   decreases turbine diameter
    3.   increases turbine diameter
88. Why are nozzle guide vanes fitted ?
    1.   To increase velocity of the air flow
    2.   To increase velocity of the gas flow
    3.   To decrease velocity of the gas flow
89. The three main types of turbine blades are ?
    1.   impulse, vector, and impulse-vector
    2.   reaction, converging, and diverging
    3.   impulse, reaction, and impulse-reaction
90. A combustion chamber has a ?
    1.   convergent inlet, divergent outlet
    2.   convergent inlet, convergent outlet
    3.   divergent inlet, convergent outlet
91. Fuel nozzles are cleaned ?
    1.   in-situ with detergent solution
    2.   in-situ with carbon solution
    3.   with a rag and solvent
92. Secondary air in the combustion chamber is used for ?
    1.   cooling
    2.   combustion
    3.   increasing axial velocity of gases

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