AMS 274 final [ACTUAL EXAM] LATEST VERSION
[QUESTIONS AND ANSWERS] WITH PRACTICE EXAM
DETAILED AND VERIFIED FOR GUARANTEED PASS-
LATEST UPDATE 2025 GRADED A (BRAND NEW!!)
newtons 3rd law - ✔✔✔✔✔ For every action there is an equal and opposite reaction
(one in one out theory)
bernoullis principle - ✔✔✔✔✔ air acts as an incompressible fluid when flowing at
subsonic speeds; as the air velocity increases pressure decreases
otto's cycle - ✔✔✔✔✔ operating principle for reciprocating engine, 4 stroke 5 event
cycle, intake, compression, ignition, power, exhaust
brayton cycle - ✔✔✔✔✔ constant pressure cycle, a thermodynamic cycle used to
describe continuous combustion like in turbine engines, intake, compression,
combustion, and exhaust
What are the disadvantages of FADEC (3) - ✔✔✔✔✔ higher system complexity,
greater reliance on electrical power, potential for total system failure
What are the advantages of a FADEC system (4) - ✔✔✔✔✔ enhance fuel efficiency,
improve thrust management, automatic engine condition monitoring, reduce pilot
workload
is FADEC an airframe or engine component - ✔✔✔✔✔ engine
what does FADEC stand for - ✔✔✔✔✔ Full Authority Digital Engine Control
what are the advantages of a free turbine - ✔✔✔✔✔ prop can be held at low rpm
during taxi, engine is easier to start, propeller and prop gearbox do not directly transmit
vibrations into the gas generator, a rotor brake can be used to stop prop movement
during a/c loading when engine shutdown is not desired
Why do compressor stalls happen - ✔✔✔✔✔ turbulent/disruptive airflow to the engine
caused by: excessive fuel flow result of acceleration, excessively lean mix result of
deceleration, contaminated compressor/damaged components
, what indication shows in the cockpit to indicate a compressor stall - ✔✔✔✔✔ audible
noise, fluctuation in RPM, increase in EGT
what are the sections of a turbojet engine - ✔✔✔✔✔ compressor, combustor, and
turbine.
what are the sections of a turboshaft engine - ✔✔✔✔✔ gas generator and power
turbine
what are the sections of a turbofan engine - ✔✔✔✔✔ Fan, compressor, turbine,
exhaust
what is customer service air - ✔✔✔✔✔ extracted from compressor discharge air,
'cleaner' than engine service air
what is engine service air - ✔✔✔✔✔ supplied by the compressor section, cools hot
section parts, pressurize bearing seals, and provides inlet anti-icing/fuel system heat
what is the % of thrust comes from the fan vs core on a low bypass turbofan - ✔✔✔✔✔
fan = 30-60%
exhaust = 40-70%
what is the % of thrust comes from the fan vs core on a high bypass turbofan - ✔✔✔✔✔
fan = 80-90%
exhaust = 10-20%
what is the ratio for low bypass turbofans - ✔✔✔✔✔ 1:1
what is the ratio for medium bypass turbofans - ✔✔✔✔✔ 2:1 or 3:1
what is the ratio for high bypass turbofans - ✔✔✔✔✔ 4:1 to 9:1
what is the % of thrust distribution on a turboprop - ✔✔✔✔✔ 75-95% prop, 5-25% gas
what are the two types of rockets - ✔✔✔✔✔ solid fuel rocket and liquid fuel rocket
what does the specific gravity adjustment allow you to do? - ✔✔✔✔✔ able to reset
tension on the differential pressure regulating valve spring within the fuel control when
using an alternate fuel for performance testing (ex Jet A to Jet B)
what will excessive wind in the direction of the tailpipe while trimming cause - ✔✔✔✔✔
false high turbine discharge pressure, resulting in low trim
[QUESTIONS AND ANSWERS] WITH PRACTICE EXAM
DETAILED AND VERIFIED FOR GUARANTEED PASS-
LATEST UPDATE 2025 GRADED A (BRAND NEW!!)
newtons 3rd law - ✔✔✔✔✔ For every action there is an equal and opposite reaction
(one in one out theory)
bernoullis principle - ✔✔✔✔✔ air acts as an incompressible fluid when flowing at
subsonic speeds; as the air velocity increases pressure decreases
otto's cycle - ✔✔✔✔✔ operating principle for reciprocating engine, 4 stroke 5 event
cycle, intake, compression, ignition, power, exhaust
brayton cycle - ✔✔✔✔✔ constant pressure cycle, a thermodynamic cycle used to
describe continuous combustion like in turbine engines, intake, compression,
combustion, and exhaust
What are the disadvantages of FADEC (3) - ✔✔✔✔✔ higher system complexity,
greater reliance on electrical power, potential for total system failure
What are the advantages of a FADEC system (4) - ✔✔✔✔✔ enhance fuel efficiency,
improve thrust management, automatic engine condition monitoring, reduce pilot
workload
is FADEC an airframe or engine component - ✔✔✔✔✔ engine
what does FADEC stand for - ✔✔✔✔✔ Full Authority Digital Engine Control
what are the advantages of a free turbine - ✔✔✔✔✔ prop can be held at low rpm
during taxi, engine is easier to start, propeller and prop gearbox do not directly transmit
vibrations into the gas generator, a rotor brake can be used to stop prop movement
during a/c loading when engine shutdown is not desired
Why do compressor stalls happen - ✔✔✔✔✔ turbulent/disruptive airflow to the engine
caused by: excessive fuel flow result of acceleration, excessively lean mix result of
deceleration, contaminated compressor/damaged components
, what indication shows in the cockpit to indicate a compressor stall - ✔✔✔✔✔ audible
noise, fluctuation in RPM, increase in EGT
what are the sections of a turbojet engine - ✔✔✔✔✔ compressor, combustor, and
turbine.
what are the sections of a turboshaft engine - ✔✔✔✔✔ gas generator and power
turbine
what are the sections of a turbofan engine - ✔✔✔✔✔ Fan, compressor, turbine,
exhaust
what is customer service air - ✔✔✔✔✔ extracted from compressor discharge air,
'cleaner' than engine service air
what is engine service air - ✔✔✔✔✔ supplied by the compressor section, cools hot
section parts, pressurize bearing seals, and provides inlet anti-icing/fuel system heat
what is the % of thrust comes from the fan vs core on a low bypass turbofan - ✔✔✔✔✔
fan = 30-60%
exhaust = 40-70%
what is the % of thrust comes from the fan vs core on a high bypass turbofan - ✔✔✔✔✔
fan = 80-90%
exhaust = 10-20%
what is the ratio for low bypass turbofans - ✔✔✔✔✔ 1:1
what is the ratio for medium bypass turbofans - ✔✔✔✔✔ 2:1 or 3:1
what is the ratio for high bypass turbofans - ✔✔✔✔✔ 4:1 to 9:1
what is the % of thrust distribution on a turboprop - ✔✔✔✔✔ 75-95% prop, 5-25% gas
what are the two types of rockets - ✔✔✔✔✔ solid fuel rocket and liquid fuel rocket
what does the specific gravity adjustment allow you to do? - ✔✔✔✔✔ able to reset
tension on the differential pressure regulating valve spring within the fuel control when
using an alternate fuel for performance testing (ex Jet A to Jet B)
what will excessive wind in the direction of the tailpipe while trimming cause - ✔✔✔✔✔
false high turbine discharge pressure, resulting in low trim
