AMS 274 TURBINES LATEST
FINAL EXAM
What are the 2 types of main engine bearings found in turbines and what
types of loads can they take? - ANSWERS-1. Ball bearings (take axial
loads)
2. Roller bearings (take radial/centrifugal loads)
Fir tree turbine blades are: - ANSWERS-Impulse-Reaction type blades
What are the most common type of blades found on turbines? -
ANSWERS-Impulse-Reaction type blades
Active clearance control is for what? - ANSWERS-Turbine case cooling
What is the most common type of compressor blades? - ANSWERS-
Dovetail
What alloys are used in the turbine section? - ANSWERS-Nickel-based
alloys to withstand the heat
What does the pressure relief valve in the oil system do? - ANSWERS-
1. Provides positive pressure
END OF
PAGE 1
, AMS 274 TURBINES LATEST
FINAL EXAM
2. Prevents tank failure
3. Prevents foaming
The dwell chamber/oil tank de-airator does what in the oil system? -
ANSWERS-Removes air from the scavenge subsystem oil
What are the 2 sources oused to cool oil? - ANSWERS-Fuel and air
What are the 3 subsystems in the oil system? - ANSWERS-Scavenge,
pressure, and breather
When is the last-chance filter/system used? - ANSWERS-Only when the
main filter is completely clogged
What is the terminating point within the pressure subsystem in the oil
system? - ANSWERS-Oil jet
What determines a hot tank vs. a cold tank? - ANSWERS-Where the
cooler is located
Hot = cooler located in pressure subsys.
END OF
PAGE 2
FINAL EXAM
What are the 2 types of main engine bearings found in turbines and what
types of loads can they take? - ANSWERS-1. Ball bearings (take axial
loads)
2. Roller bearings (take radial/centrifugal loads)
Fir tree turbine blades are: - ANSWERS-Impulse-Reaction type blades
What are the most common type of blades found on turbines? -
ANSWERS-Impulse-Reaction type blades
Active clearance control is for what? - ANSWERS-Turbine case cooling
What is the most common type of compressor blades? - ANSWERS-
Dovetail
What alloys are used in the turbine section? - ANSWERS-Nickel-based
alloys to withstand the heat
What does the pressure relief valve in the oil system do? - ANSWERS-
1. Provides positive pressure
END OF
PAGE 1
, AMS 274 TURBINES LATEST
FINAL EXAM
2. Prevents tank failure
3. Prevents foaming
The dwell chamber/oil tank de-airator does what in the oil system? -
ANSWERS-Removes air from the scavenge subsystem oil
What are the 2 sources oused to cool oil? - ANSWERS-Fuel and air
What are the 3 subsystems in the oil system? - ANSWERS-Scavenge,
pressure, and breather
When is the last-chance filter/system used? - ANSWERS-Only when the
main filter is completely clogged
What is the terminating point within the pressure subsystem in the oil
system? - ANSWERS-Oil jet
What determines a hot tank vs. a cold tank? - ANSWERS-Where the
cooler is located
Hot = cooler located in pressure subsys.
END OF
PAGE 2
