All Practice Exams
100+ Free Module 17 Propeller Practice Questions
Pass your UK CAA Part-66 AME Module 17 — Propeller exam on the first try — instant access, no signup required.
✓ No registration✓ No credit card✓ No hidden fees✓ Start practicing immediately
100+ Questions
100% Free
Loading practice questions...
Same family resources
Explore More UK CAA Part-66 AME Licence Modules
Continue into nearby exams from the same family. Each card keeps practice questions, study guides, flashcards, videos, and articles in one place.
Sample Module 17 Propeller Practice Questions
Try these sample questions to test your Module 17 Propeller exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1According to blade element theory, how is an aircraft propeller blade defined structurally and aerodynamically?
A.As a continuous twisted airfoil composed of an infinite number of small airfoil sections operating at varying velocities and pitch angles
B.As a symmetrical flat plate producing uniform thrust across its entire span
C.As a variable-camber foil that changes thickness in flight via internal hydraulic actuators
D.As a rigid rotating disc where aerodynamic lift acts only at the extreme blade tip
Explanation: Blade element theory treats a propeller blade as a series of small, connected airfoil elements along its radius. Because rotational linear velocity increases from root to tip (v = ωr), each element is set at a progressively smaller angle of attack/blade angle (blade twist) so all elements operate at optimum efficiency.
2What is defined as the theoretical distance an aircraft propeller would move forward in one complete revolution through a non-yielding solid medium?
A.Effective pitch
B.Geometric pitch
C.Propeller slip
D.Angle of advance
Explanation: Geometric pitch is the distance a propeller element would advance in one 360° revolution if it were turning through a solid, non-slipping medium. It is determined purely by the blade angle relative to the plane of rotation.
3An aircraft propeller has a geometric pitch of 80 inches. During cruise flight at a given airspeed and RPM, its effective pitch is measured at 64 inches. What is the propeller slip percentage?
A.25%
B.16%
C.20%
D.80%
Explanation: Propeller slip = Geometric Pitch - Effective Pitch = 80 in - 64 in = 16 inches. Slip percentage = (Slip / Geometric Pitch) * 100 = (16 / 80) * 100 = 20%.
4Why is a propeller blade twisted along its length from root to tip?
A.To ensure the root section produces maximum thrust while the tip section produces zero drag
B.To allow the centrifugal force to pull the blade into coarse pitch automatically at high engine RPM
C.To equalize the mechanical bending stress caused by engine exhaust gas impingement
D.To maintain a relatively constant angle of attack along the blade despite increasing rotational linear velocity toward the tip
Explanation: Rotational linear speed increases proportionally with radius (v = 2πr × RPM). Since relative airflow speed increases toward the tip, the blade angle must decrease toward the tip (blade twist) to maintain an even angle of attack and prevent tip stalling.
5Which force acting on a rotating propeller blade creates Centrifugal Turning Moment (CTM)?
A.Centrifugal force acting on the mass of the blade attempting to align blade elements with the plane of rotation, turning it toward fine pitch
B.Aerodynamic lift acting forward of the pitch change axis turning the blade toward feather
C.Engine oil pressure pushing against the hub piston to rotate the blade toward reverse pitch
D.Torque bending force bending the blade tip opposite to the direction of rotation
Explanation: Centrifugal Turning Moment (CTM) arises because centrifugal force acts on every mass particle of the rotating blade. The force attempts to align the blade's chord line with the plane of rotation, creating a strong twisting moment toward FINE pitch (lower blade angle).
6How does Aerodynamic Turning Moment (ATM) affect propeller blade pitch angle during operation?
A.It acts behind the pitch-change axis and forces the blade into reverse pitch
B.It acts forward of the blade pitch-change axis and tends to turn the blade toward a higher blade angle (coarse pitch)
C.It counteracts centrifugal force and reduces total blade tensile stress to zero
D.It twists the blade shank toward negative pitch whenever airspeed exceeds Vne
Explanation: Aerodynamic Turning Moment (ATM) is caused by aerodynamic lift acting on the blade airfoil section. Because the center of lift is located forward of the blade's pitch-change axis, ATM tends to rotate the blade toward a higher blade angle (COARSE pitch). Under normal operating conditions, CTM is stronger than ATM.
7What happens to the angle of attack of a fixed-pitch propeller if aircraft forward velocity increases while engine RPM remains constant?
A.The angle of attack increases proportionally
B.The angle of attack remains completely unaffected
C.The angle of attack decreases
D.The angle of attack reverses to negative 90 degrees
Explanation: The relative airflow vector is the resultant of rotational velocity (RPM component) and forward airspeed (forward flight vector). Increasing forward velocity increases the forward airflow vector component, tilting the relative airflow closer to the blade chord line and thereby DECREASING the angle of attack.
8Where along the radius of a typical propeller blade is the maximum aerodynamic thrust generated?
A.At the extreme blade tip (100% radius)
B.Directly at the blade shank root (0% to 10% radius)
C.Equally distributed across all radial stations from hub to tip
D.At approximately 70% to 75% of the blade radius
Explanation: Peak aerodynamic efficiency and maximum thrust production occur around 70% to 75% of the blade radius. Near the hub, rotational velocity is too low for significant thrust; at the extreme tip, tip losses and compressibility effects reduce efficiency.
9Which force is responsible for the greatest mechanical stress imposed on an operating propeller blade?
A.Centrifugal force
B.Thrust bending force
C.Torque bending force
D.Aerodynamic turning moment
Explanation: Centrifugal force is by far the largest mechanical stress acting on a propeller blade. At high RPM, centrifugal force generates immense tensile stress pulling the blade outward from the hub (often exceeding several tons of force per blade).
10What is the relationship between Centrifugal Turning Moment (CTM) and Aerodynamic Turning Moment (ATM) during normal cruising flight?
A.ATM is greater than CTM, giving the blade a natural tendency to feather automatically
B.CTM is greater than ATM, giving the blade a natural tendency to move toward fine pitch
C.CTM and ATM are always exactly equal and opposite under all operating conditions
D.CTM acts only on tractor propellers while ATM acts only on pusher propellers
Explanation: Under all normal operating speed ranges, Centrifugal Turning Moment (CTM) significantly exceeds Aerodynamic Turning Moment (ATM). Therefore, the net physical tendency of a rotating propeller blade is to rotate toward FINE pitch unless resisted by oil pressure, counterweights, or springs.
About the Module 17 Propeller Exam
UK CAA Part-66 Module 17 covers propeller aerodynamics, governor operation, feathering mechanisms, synchrophasers, and blade maintenance for B1.1/B1.2 AME candidates. Exam includes 32 MCQs with a 75% pass mark.
Questions
32 scored questions
Time Limit
40 minutes
Passing Score
75%
Exam Fee
£75 (UK Civil Aviation Authority (CAA))
Module 17 Propeller Exam Content Outline
50%
Core Knowledge & Regulations
Fundamental principles, laws, and operating requirements.
50%
Applied Systems & Calculations
Practical application, calculations, and maintenance procedures.
How to Pass the Module 17 Propeller Exam
What You Need to Know
- Passing score: 75%
- Exam length: 32 questions
- Time limit: 40 minutes
- Exam fee: £75
Keys to Passing
- Complete 500+ practice questions
- Score 80%+ consistently before scheduling
- Focus on highest-weighted sections
- Use our AI tutor for tough concepts
Module 17 Propeller Study Tips from Top Performers
1Review official CAA syllabus and learning objectives.
2Practise worked calculations and formula applications.
Frequently Asked Questions
What is the pass mark for Module 17 Propeller?
The pass mark required by the UK CAA is 75%.