AMS 274 Turbines Final UPDATED Exam Questions and CORRECT Answers
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Course
AMS 274 Turbines
Institution
AMS 274 Turbines
AMS 274 Turbines Final UPDATED Exam
Questions and CORRECT Answers
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 c...
AMS 274 Turbines Final UPDATED Exam
Questions and CORRECT Answers
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
What is another name for an impeller? - Correct Answer- A centrifugal compressor
What does Fn stand for? - Correct Answer- Thrust net
What does Fg stand for? - Correct Answer- Static thrust (gross thrust)
How do you calculate bypass ratio? - Correct Answer- airflow of the fan/airflow of the core
What do inlet guide vanes do, and are they part of the compressor? - Correct Answer-
Stationary airfoils which proceed the 1st stage compressor rotor blades and are used to direct
air into the blades at the optimal angle (No, they are not part of the compressor)
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