AMS 274 final Exam Questions and Answers Already Passed Latest Update 2025-2026
newtons 1st law - Answers (Law of Inertia) an object in motion tends to stay in motion & an
object at rest stays at rest unless acted upon by an outside force.
newtons 2nd law - Answers Force = mass x acceleration
newtons 3rd law - Answers For every action there is an equal and opposite reaction (one in one
out theory)
bernoullis principle - Answers air acts as an incompressible fluid when flowing at subsonic
speeds; as the air velocity increases pressure decreases
otto's cycle - Answers operating principle for reciprocating engine, 4 stroke 5 event cycle, intake,
compression, ignition, power, exhaust
brayton cycle - Answers 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) - Answers higher system complexity, greater reliance
on electrical power, potential for total system failure
What are the advantages of a FADEC system (4) - Answers enhance fuel efficiency, improve
thrust management, automatic engine condition monitoring, reduce pilot workload
is FADEC an airframe or engine component - Answers engine
what does FADEC stand for - Answers Full Authority Digital Engine Control
what are the advantages of a free turbine - Answers 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 - Answers 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 - Answers audible noise,
fluctuation in RPM, increase in EGT
what are the sections of a turbojet engine - Answers compressor, combustor, and turbine.
what are the sections of a turboshaft engine - Answers gas generator and power turbine
what are the sections of a turbofan engine - Answers Fan, compressor, turbine, exhaust
, what is customer service air - Answers extracted from compressor discharge air, 'cleaner' than
engine service air
what is engine service air - Answers 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 - Answers fan = 30-
60%
exhaust = 40-70%
what is the % of thrust comes from the fan vs core on a high bypass turbofan - Answers fan =
80-90%
exhaust = 10-20%
what is the ratio for low bypass turbofans - Answers 1:1
what is the ratio for medium bypass turbofans - Answers 2:1 or 3:1
what is the ratio for high bypass turbofans - Answers 4:1 to 9:1
what is the % of thrust distribution on a turboprop - Answers 75-95% prop, 5-25% gas
what are the two types of rockets - Answers solid fuel rocket and liquid fuel rocket
what does the specific gravity adjustment allow you to do? - Answers 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 - Answers false
high turbine discharge pressure, resulting in low trim
what will excessive wind in the inlet while trimming cause - Answers false high compression
and turbine discharge, resulting in low trim
what 2 factors can prevent you from trimming an a/c - Answers wind temperature/velocity
limits
How is rigging accomplished on a turbine engine - Answers by setting the throttle springback
and cushion so that your power level setting is correct for takeoff
what is trimming and when is it performed - Answers it applies to idle RPM and maximum thrust
adjustments, usually done after maintenance that might have affected engine performance or
during time checks
what direction should you make final adjustments while trimming - Answers final adjustments
should be made in the increasing direction
newtons 1st law - Answers (Law of Inertia) an object in motion tends to stay in motion & an
object at rest stays at rest unless acted upon by an outside force.
newtons 2nd law - Answers Force = mass x acceleration
newtons 3rd law - Answers For every action there is an equal and opposite reaction (one in one
out theory)
bernoullis principle - Answers air acts as an incompressible fluid when flowing at subsonic
speeds; as the air velocity increases pressure decreases
otto's cycle - Answers operating principle for reciprocating engine, 4 stroke 5 event cycle, intake,
compression, ignition, power, exhaust
brayton cycle - Answers 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) - Answers higher system complexity, greater reliance
on electrical power, potential for total system failure
What are the advantages of a FADEC system (4) - Answers enhance fuel efficiency, improve
thrust management, automatic engine condition monitoring, reduce pilot workload
is FADEC an airframe or engine component - Answers engine
what does FADEC stand for - Answers Full Authority Digital Engine Control
what are the advantages of a free turbine - Answers 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 - Answers 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 - Answers audible noise,
fluctuation in RPM, increase in EGT
what are the sections of a turbojet engine - Answers compressor, combustor, and turbine.
what are the sections of a turboshaft engine - Answers gas generator and power turbine
what are the sections of a turbofan engine - Answers Fan, compressor, turbine, exhaust
, what is customer service air - Answers extracted from compressor discharge air, 'cleaner' than
engine service air
what is engine service air - Answers 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 - Answers fan = 30-
60%
exhaust = 40-70%
what is the % of thrust comes from the fan vs core on a high bypass turbofan - Answers fan =
80-90%
exhaust = 10-20%
what is the ratio for low bypass turbofans - Answers 1:1
what is the ratio for medium bypass turbofans - Answers 2:1 or 3:1
what is the ratio for high bypass turbofans - Answers 4:1 to 9:1
what is the % of thrust distribution on a turboprop - Answers 75-95% prop, 5-25% gas
what are the two types of rockets - Answers solid fuel rocket and liquid fuel rocket
what does the specific gravity adjustment allow you to do? - Answers 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 - Answers false
high turbine discharge pressure, resulting in low trim
what will excessive wind in the inlet while trimming cause - Answers false high compression
and turbine discharge, resulting in low trim
what 2 factors can prevent you from trimming an a/c - Answers wind temperature/velocity
limits
How is rigging accomplished on a turbine engine - Answers by setting the throttle springback
and cushion so that your power level setting is correct for takeoff
what is trimming and when is it performed - Answers it applies to idle RPM and maximum thrust
adjustments, usually done after maintenance that might have affected engine performance or
during time checks
what direction should you make final adjustments while trimming - Answers final adjustments
should be made in the increasing direction
