AMS 274 TURBINES FINAL FINAL TEST
2026 QUESTIONS WITH CORRECT
ANSWERS GRADED A+
◍ newtons 1st law.
Answer: (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.
◍ What does the diffuser do.
Answer: increases pressuredecreases velocity
◍ What does the first turbine tun.
Answer: The N2 compressor
◍ newtons 2nd law.
Answer: Force = mass x acceleration
◍ newtons 3rd law.
Answer: For every action there is an equal and opposite reaction (one in one
out theory)
◍ where is the highest pressure found.
Answer: at the diffuser (AKA the outlet of the compressor)
◍ What does the nozzle diaphram do.
Answer: increases velocity and directs flow
◍ What does P+5 mean.
Answer: pressure total at engine station 5
◍ bernoullis principle.
Answer: air acts as an incompressible fluid when flowing at subsonic
speeds; as the air velocity increases pressure decreases
, ◍ otto's cycle.
Answer: operating principle for reciprocating engine, 4 stroke 5 event cycle,
intake, compression, ignition, power, exhaust
◍ brayton cycle.
Answer: 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).
Answer: higher system complexity, greater reliance on electrical power,
potential for total system failure
◍ What are the advantages of a FADEC system (4).
Answer: enhance fuel efficiency, improve thrust management, automatic
engine condition monitoring, reduce pilot workload
◍ What are the type of cracks called that run perpendicular to the blade edges.
Answer: stress rupture cracks
◍ is FADEC an airframe or engine component.
Answer: engine
◍ What is the cause of stress rupture cracks.
Answer: High heat
◍ what does FADEC stand for.
Answer: Full Authority Digital Engine Control
◍ what are the advantages of a free turbine.
Answer: 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.
Answer: turbulent/disruptive airflow to the engine caused by: excessive fuel
flow result of acceleration, excessively lean mix result of deceleration,
2026 QUESTIONS WITH CORRECT
ANSWERS GRADED A+
◍ newtons 1st law.
Answer: (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.
◍ What does the diffuser do.
Answer: increases pressuredecreases velocity
◍ What does the first turbine tun.
Answer: The N2 compressor
◍ newtons 2nd law.
Answer: Force = mass x acceleration
◍ newtons 3rd law.
Answer: For every action there is an equal and opposite reaction (one in one
out theory)
◍ where is the highest pressure found.
Answer: at the diffuser (AKA the outlet of the compressor)
◍ What does the nozzle diaphram do.
Answer: increases velocity and directs flow
◍ What does P+5 mean.
Answer: pressure total at engine station 5
◍ bernoullis principle.
Answer: air acts as an incompressible fluid when flowing at subsonic
speeds; as the air velocity increases pressure decreases
, ◍ otto's cycle.
Answer: operating principle for reciprocating engine, 4 stroke 5 event cycle,
intake, compression, ignition, power, exhaust
◍ brayton cycle.
Answer: 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).
Answer: higher system complexity, greater reliance on electrical power,
potential for total system failure
◍ What are the advantages of a FADEC system (4).
Answer: enhance fuel efficiency, improve thrust management, automatic
engine condition monitoring, reduce pilot workload
◍ What are the type of cracks called that run perpendicular to the blade edges.
Answer: stress rupture cracks
◍ is FADEC an airframe or engine component.
Answer: engine
◍ What is the cause of stress rupture cracks.
Answer: High heat
◍ what does FADEC stand for.
Answer: Full Authority Digital Engine Control
◍ what are the advantages of a free turbine.
Answer: 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.
Answer: turbulent/disruptive airflow to the engine caused by: excessive fuel
flow result of acceleration, excessively lean mix result of deceleration,
