AS 121 EXAM 3 QUESTIONS WITH 100%
CORRECT ANSWERS LATEST VERSION
2025/2026.
Standard pressure at 10000 feet is (according to the values on the FAA table) - ANS 20.57
inches of mercury
Which of the following helps determine the shape of the airfoil? - ANS Purpose of the specific
aircraft
As angle of attack increases, the center of pressure (CP) - ANS Moves forward
What will happen to an object immersed in fluid when pressure on one surface of the object
becomes less than pressure on the other surface of the object? - ANS The object will move in
the direction of the lower pressure
The standard atmosphere at sea level is - ANS 15 degrees C and 29.92 inches of mercury
The weight of the atmosphere at 18000 feet is ______ what it is at sea level. - ANS 1/2
Why is pressure altitude important to pilots? - ANS It is used to determine airplane
performance
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,Newton and Bernoulli have stated laws that fully explain how lift is formulated. - ANS false
What are the effects of less dense air on aircraft performance? - ANS Reduces power, thrust,
lift
Most of the atmosphere's oxygen is contained below ___________ feet. - ANS 35,000
Which statement relates to Bernoulli's principle? - ANS Air traveling faster over the curved
upper surface of an airfoil causes lower pressure on the top surface.
When are the four forces that act on an airplane in equilibrium? - ANS During unaccelerated
level flight.
What is the relationship of lift, drag, thrust, and weight when the airplane is in straight-and-level
flight? - ANS Lift equals weight and thrust equals drag.
What happens when an aircraft reaches the critical angle of attack? - ANS Any further
increase in angle of attack causes the wing to stall
Ground Effect becomes effective within - ANS One (1) wingspan above the surface
An aircraft always will Stall when - ANS The Critical Angle of Attack is exceeded
The penalty for a wing producing lift is called - ANS Induced drag
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, Wingtip vortices are greatest when the generating aircraft is - ANS Heavy, clean (gear and
flaps up), and slow
Aspect ratio is the ratio of - ANS The wing span to the wing chord
The acronym used in class for the engine used in our Cessna 172 aircraft is - ANS HAND FL
An increase in aspect ratio with a constant velocity will - ANS Decrease the drag
Which of the following is affected significantly by aircraft stability? - ANS Maneuverability
Induced drag is a by-product of - ANS Lift
What is dihedral and what is its purpose? - ANS Outer wing tips are higher than the wing
roots - helps the aircraft with roll stability
Angle of attack is defined as the acute angle between the chord line of the airfoil and -
ANS The direction of the relative wind
Aircraft stability is primarily due to - ANS The design characteristics of the aircraft
In order for an airplane to maintain level flight the pilot must coordinate the - ANS Angle of
attack (AOA) and thrust
In steady flight, the sum of the opposing forces is - ANS Zero
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
CORRECT ANSWERS LATEST VERSION
2025/2026.
Standard pressure at 10000 feet is (according to the values on the FAA table) - ANS 20.57
inches of mercury
Which of the following helps determine the shape of the airfoil? - ANS Purpose of the specific
aircraft
As angle of attack increases, the center of pressure (CP) - ANS Moves forward
What will happen to an object immersed in fluid when pressure on one surface of the object
becomes less than pressure on the other surface of the object? - ANS The object will move in
the direction of the lower pressure
The standard atmosphere at sea level is - ANS 15 degrees C and 29.92 inches of mercury
The weight of the atmosphere at 18000 feet is ______ what it is at sea level. - ANS 1/2
Why is pressure altitude important to pilots? - ANS It is used to determine airplane
performance
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,Newton and Bernoulli have stated laws that fully explain how lift is formulated. - ANS false
What are the effects of less dense air on aircraft performance? - ANS Reduces power, thrust,
lift
Most of the atmosphere's oxygen is contained below ___________ feet. - ANS 35,000
Which statement relates to Bernoulli's principle? - ANS Air traveling faster over the curved
upper surface of an airfoil causes lower pressure on the top surface.
When are the four forces that act on an airplane in equilibrium? - ANS During unaccelerated
level flight.
What is the relationship of lift, drag, thrust, and weight when the airplane is in straight-and-level
flight? - ANS Lift equals weight and thrust equals drag.
What happens when an aircraft reaches the critical angle of attack? - ANS Any further
increase in angle of attack causes the wing to stall
Ground Effect becomes effective within - ANS One (1) wingspan above the surface
An aircraft always will Stall when - ANS The Critical Angle of Attack is exceeded
The penalty for a wing producing lift is called - ANS Induced drag
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, Wingtip vortices are greatest when the generating aircraft is - ANS Heavy, clean (gear and
flaps up), and slow
Aspect ratio is the ratio of - ANS The wing span to the wing chord
The acronym used in class for the engine used in our Cessna 172 aircraft is - ANS HAND FL
An increase in aspect ratio with a constant velocity will - ANS Decrease the drag
Which of the following is affected significantly by aircraft stability? - ANS Maneuverability
Induced drag is a by-product of - ANS Lift
What is dihedral and what is its purpose? - ANS Outer wing tips are higher than the wing
roots - helps the aircraft with roll stability
Angle of attack is defined as the acute angle between the chord line of the airfoil and -
ANS The direction of the relative wind
Aircraft stability is primarily due to - ANS The design characteristics of the aircraft
In order for an airplane to maintain level flight the pilot must coordinate the - ANS Angle of
attack (AOA) and thrust
In steady flight, the sum of the opposing forces is - ANS Zero
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
