AMS 274 Turbines Final Exam questions and answers 2026\2027 A+
Grade
If the anti-ice air valve is open what happens to EGT?
- correct answer EGT increases (tachometer and EPR also shift)
How do you calculate EPR?
- correct answer Turbine discharge/Compressor inlet pressure
What are the most common type of thermocouples used?
- correct answer Chromel/Alumel (CA)
What do the older style APUs have in them?
- correct answer Governors
What is the typical gear down ratio for pneumatic starters?
- correct answer 25:1
What is the starting sequence for turbine engines?
- correct answer Starter --> Ignition --> Fuel
you hear a clicking noise from the pneumatic starter it indicates:
- correct answer The pawls re-engaging (normal)
Typical air flow in a pneumatic starter:
- correct answer Air flows into the starter --> Stator vanes (designed to choke in order to prevent
overspeed) --> Turbine
, What was Whittle famous for?
- correct answer Invented the jet engine
What are the 4 types of gas turbines and typical aircraft they are found on:
- correct answer 1. Turbojet (supersonic)
2. Turbofan (large commercial)
3. Turboprop (larger GA)
4. Turboshaft (helicopters)
What is the Brayton Cyle?
- correct answer thermodynamic cycle that explains how gas turbine engines run
Bernoulli's principle:
- correct 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.?
- correct answer General Electric
In a split-spool/dual-spool/twin-spool turbine, what drives what?
- correct 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?
- correct answer A power turbine
What is the low bypass, medium bypass, and high bypass general engine ratios?
- correct answer Low: 1:1
Medium: 2:1 to 3:1
High: 4:1 to 9:1
Grade
If the anti-ice air valve is open what happens to EGT?
- correct answer EGT increases (tachometer and EPR also shift)
How do you calculate EPR?
- correct answer Turbine discharge/Compressor inlet pressure
What are the most common type of thermocouples used?
- correct answer Chromel/Alumel (CA)
What do the older style APUs have in them?
- correct answer Governors
What is the typical gear down ratio for pneumatic starters?
- correct answer 25:1
What is the starting sequence for turbine engines?
- correct answer Starter --> Ignition --> Fuel
you hear a clicking noise from the pneumatic starter it indicates:
- correct answer The pawls re-engaging (normal)
Typical air flow in a pneumatic starter:
- correct answer Air flows into the starter --> Stator vanes (designed to choke in order to prevent
overspeed) --> Turbine
, What was Whittle famous for?
- correct answer Invented the jet engine
What are the 4 types of gas turbines and typical aircraft they are found on:
- correct answer 1. Turbojet (supersonic)
2. Turbofan (large commercial)
3. Turboprop (larger GA)
4. Turboshaft (helicopters)
What is the Brayton Cyle?
- correct answer thermodynamic cycle that explains how gas turbine engines run
Bernoulli's principle:
- correct 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.?
- correct answer General Electric
In a split-spool/dual-spool/twin-spool turbine, what drives what?
- correct 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?
- correct answer A power turbine
What is the low bypass, medium bypass, and high bypass general engine ratios?
- correct answer Low: 1:1
Medium: 2:1 to 3:1
High: 4:1 to 9:1
