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Advantages of Centrifugal over Axial Compressor -ANSWERS-- High compression
ratio (10::1 - Dual)
- Good efficiency
- Simplicity
- Lower weight (for smaller engines)
- Easy to start (due to low mass)
Disadvantages of Centrifugal over Axial Compressor -ANSWERS-- Large frontal
area (more drag)
- 15:1 largest ratio (due to weight)
Diverging -ANSWERS-Velocity decreases, pressure increases (Subsonic Conditions)
Converging -ANSWERS-Velocity increases, pressure decreases (Subsonic
Conditions)
Dual Spool Compressor -ANSWERS-Utilizes 2 independently rotating axial flow
compressors
Fg (Gross Thrust) -ANSWERS-Force the engine exerts against its mounts while
operating but not moving - also known as static thrust
, Fn (Net Thrust) -ANSWERS-Effective thrust developed by the engine during flight
PT7 -ANSWERS-Total pressure at station No. 7 or turbine discharge pressure
(Exposure to) High Temp -ANSWERS-Reason Turbine blades are generally more
susceptible to operating damage than compressor blades
Erosion Damage (To the compressor and turbine sections) -ANSWERS-The result
of recurrent ingestion of dust or other fine airborne particulates into a turbine
engine
Cracking -ANSWERS-Type of damage a turbine engine hot section is particularly
susceptible to
Graphite/Lead -ANSWERS-Writing material that can not be used on turbine
blades?
Across l/e or t/e at a right angle (to the edge length) -ANSWERS-Location of stress
rupture cracks on turbine blades
Overtemp Condition -ANSWERS-When the leading edge of a first-stage turbine
blade is found to have stress rupture cracks, which of the following should be
suspected?.
Stress rupture -ANSWERS-When aircraft turbine blades are subjected to excessive
heat stress, what type of failures would you expect?