AMS 274 TURBINES FINAL
COMPREHENSIVE STUDY GUIDE 2026
FULL QUESTIONS AND SOLUTIONS
GRADED A+
◍ If the anti-ice air valve is open what happens to EGT?.
Answer: EGT increases (tachometer and EPR also shift)
◍ How do you calculate EPR?.
Answer: Turbine discharge/Compressor inlet pressure
◍ What are the most common type of thermocouples used?.
Answer: Chromel/Alumel (CA)
◍ What do the older style APUs have in them?.
Answer: Governors
◍ What is the typical gear down ratio for pneumatic starters?.
Answer: 25:1
◍ What is the starting sequence for turbine engines?.
Answer: Starter --> Ignition --> Fuel
◍ you hear a clicking noise from the pneumatic starter it indicates:.
Answer: The pawls re-engaging (normal)
◍ Typical air flow in a pneumatic starter:.
Answer: Air flows into the starter --> Stator vanes (designed to choke in
order to prevent overspeed) --> Turbine
◍ What was Whittle famous for?.
Answer: Invented the jet engine
, ◍ What are the 4 types of gas turbines and typical aircraft they are found on:.
Answer: 1. Turbojet (supersonic)2. Turbofan (large commercial)3.
Turboprop (larger GA)4. Turboshaft (helicopters)
◍ What is the Brayton Cyle?.
Answer: thermodynamic cycle that explains how gas turbine engines run
◍ Bernoulli's principle:.
Answer: As the velocity of a fluid increases, the pressure exerted by the
fluid decreases (convergent ducts: velocity increases and pressure
decreases/divergent ducts: velocity decreases and pressure increases)
◍ What company produced the first gas turbine engine in the
U. S.?.
Answer: General Electric
◍ In a split-spool/dual-spool/twin-spool turbine, what drives what?.
Answer: The low-speed turbine drives the first compressor The high speed
turbine drives the second compressor
◍ What is typically found in a turboshaft engine?.
Answer: A power turbine
◍ What is the low bypass, medium bypass, and high bypass general engine
ratios?.
Answer: Low: 1:1Medium: 2:1 to 3:1High: 4:1 to 9:1
◍ What is another name for an impeller?.
Answer: A centrifugal compressor
◍ What does Fn stand for?.
Answer: Thrust net
◍ What does Fg stand for?.
Answer: Static thrust (gross thrust)
◍ How do you calculate bypass ratio?.
Answer: airflow of the fan/airflow of the core
COMPREHENSIVE STUDY GUIDE 2026
FULL QUESTIONS AND SOLUTIONS
GRADED A+
◍ If the anti-ice air valve is open what happens to EGT?.
Answer: EGT increases (tachometer and EPR also shift)
◍ How do you calculate EPR?.
Answer: Turbine discharge/Compressor inlet pressure
◍ What are the most common type of thermocouples used?.
Answer: Chromel/Alumel (CA)
◍ What do the older style APUs have in them?.
Answer: Governors
◍ What is the typical gear down ratio for pneumatic starters?.
Answer: 25:1
◍ What is the starting sequence for turbine engines?.
Answer: Starter --> Ignition --> Fuel
◍ you hear a clicking noise from the pneumatic starter it indicates:.
Answer: The pawls re-engaging (normal)
◍ Typical air flow in a pneumatic starter:.
Answer: Air flows into the starter --> Stator vanes (designed to choke in
order to prevent overspeed) --> Turbine
◍ What was Whittle famous for?.
Answer: Invented the jet engine
, ◍ What are the 4 types of gas turbines and typical aircraft they are found on:.
Answer: 1. Turbojet (supersonic)2. Turbofan (large commercial)3.
Turboprop (larger GA)4. Turboshaft (helicopters)
◍ What is the Brayton Cyle?.
Answer: thermodynamic cycle that explains how gas turbine engines run
◍ Bernoulli's principle:.
Answer: As the velocity of a fluid increases, the pressure exerted by the
fluid decreases (convergent ducts: velocity increases and pressure
decreases/divergent ducts: velocity decreases and pressure increases)
◍ What company produced the first gas turbine engine in the
U. S.?.
Answer: General Electric
◍ In a split-spool/dual-spool/twin-spool turbine, what drives what?.
Answer: The low-speed turbine drives the first compressor The high speed
turbine drives the second compressor
◍ What is typically found in a turboshaft engine?.
Answer: A power turbine
◍ What is the low bypass, medium bypass, and high bypass general engine
ratios?.
Answer: Low: 1:1Medium: 2:1 to 3:1High: 4:1 to 9:1
◍ What is another name for an impeller?.
Answer: A centrifugal compressor
◍ What does Fn stand for?.
Answer: Thrust net
◍ What does Fg stand for?.
Answer: Static thrust (gross thrust)
◍ How do you calculate bypass ratio?.
Answer: airflow of the fan/airflow of the core
