AMS 274 Turbines Final Exam Questions
With Correct Answers
If the anti-ice air valve is open what happens to EGT? - CORRECT ANSWER✔✔-
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EGT increases (tachometer and EPR also shift)
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How do you calculate EPR? - CORRECT ANSWER✔✔-Turbine
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discharge/Compressor inlet pressure
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What are the most common type of thermocouples used? - CORRECT
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ANSWER✔✔-Chromel/Alumel (CA) |
What do the older style APUs have in them? - CORRECT ANSWER✔✔-Governors
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What is the typical gear down ratio for pneumatic starters? - CORRECT
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ANSWER✔✔-25:1
What is the starting sequence for turbine engines? - CORRECT ANSWER✔✔-
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Starter --> Ignition --> Fuel
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you hear a clicking noise from the pneumatic starter it indicates: - CORRECT
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ANSWER✔✔-The pawls re-engaging (normal) | | |
Typical air flow in a pneumatic starter: - CORRECT ANSWER✔✔-Air flows into the
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starter --> Stator vanes (designed to choke in order to prevent overspeed) -->
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Turbine
, What was Whittle famous for? - CORRECT ANSWER✔✔-Invented the jet engine
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What are the 4 types of gas turbines and typical aircraft they are found on: -
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CORRECT ANSWER✔✔-1. Turbojet (supersonic)
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2. Turbofan (large commercial)
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3. Turboprop (larger GA)
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4. Turboshaft (helicopters)
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What is the Brayton Cyle? - CORRECT ANSWER✔✔-thermodynamic cycle that
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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
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ANSWER✔✔-General Electric |
In a split-spool/dual-spool/twin-spool turbine, what drives what? - CORRECT
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ANSWER✔✔-The low-speed turbine drives the first compressor | | | | | | |
The high speed turbine drives the second compressor
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What is typically found in a turboshaft engine? - CORRECT ANSWER✔✔-A power
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turbine
With 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
