MODULE: 17- PROPELLER
CATEGORY: B1.1
17.1 FUNDAMENTALS
1. When in the windmill position; ATM
A. opposes CTM.
B.is not related to CTM.
C. assists CTM.
2. As a propeller blade moves through the air, forces are produced. This forces are known as
A. lift and torque.
B. lift and drag.
C. thrust and torque.
3. A rotating propeller imparts rearwards motion to a
A. small mass of air at high velocity.
B. large mass of air at low velocity.
C. small mass of air at low velocity.
4. Propeller efficiency is
A. the ratio of output speed to input propeller speed.
B. the ratio of the work applied to the geometric pitch to useful work on the C.S.U.
C. the ratio of the useful work done by the propeller to work done by the engine on
the propeller.
5. The blade angle at the root is.
A. low.
B. high.
C. master blade angle.
6. How does torque act?
A. In the same direction as the plane of rotation.
B. At right angles to the plane of rotation.
C. In opposition to the direction of rotation.
7. The purpose of blade twist is to
A. reduce angle of attack at the blade root.
B. ensure that tip speed does not go faster than Mach 1.
C. even out thrust distribution across the propeller.
8. When is thrust greatest?
A. At 70 to 80% of propeller length.
B. In the first 50%.
C. At the same all along the length.
9. CTM changes the pitch of a blade
A. about its twisting axis.
B. bending forward.
C. towards the feather plane.
Page 1 of 10
, MODULE: 17- PROPELLER
CATEGORY: B1.1
17.2 PROPELLER CONSTRUCTION
10. The timber is often used today in propeller construction is
A. birch.
B. spruce.
C. balsa.
11. The metal that is at the tip and along the leading edge of a wooden propeller is for
A. balancing.
B. protection.
C. Anti-icing.
12. Blade cuffs are fitted to the root of the blades
A. to increase the strength of the blade.
B. to increase thrust.
C. to increase flow of cooling air into the engine nacelle.
13. A propeller is centralised on the propeller shaft by
A. the front and rear cones.
B. the front git seal.
C. the rear pre-load shims.
14. Reduction gearing allows the blade tips to
A. operate below the speed of sound.
B. operate above the speed of sound.
C. rotate slower than the root of the propeller blade.
15. A ducted propeller is used because
A. ducted props give more thrust for the diameter of disc.
B. only ducted props can be vectored.
C. ducted props give less thrust for the diameter of disc.
16. A two positions propeller uses.
A. high pitch for take off and low pitch for cruise.
B. low pitch for take off and climb and high pitch for cruise.
C. high pitch for take off and cruise and low pitch for climb and descent.
17. Solidity of a propeller can be increased by increasing
A. blade chord.
B. blade angle.
C. blade thickness.
Page 2 of 10
CATEGORY: B1.1
17.1 FUNDAMENTALS
1. When in the windmill position; ATM
A. opposes CTM.
B.is not related to CTM.
C. assists CTM.
2. As a propeller blade moves through the air, forces are produced. This forces are known as
A. lift and torque.
B. lift and drag.
C. thrust and torque.
3. A rotating propeller imparts rearwards motion to a
A. small mass of air at high velocity.
B. large mass of air at low velocity.
C. small mass of air at low velocity.
4. Propeller efficiency is
A. the ratio of output speed to input propeller speed.
B. the ratio of the work applied to the geometric pitch to useful work on the C.S.U.
C. the ratio of the useful work done by the propeller to work done by the engine on
the propeller.
5. The blade angle at the root is.
A. low.
B. high.
C. master blade angle.
6. How does torque act?
A. In the same direction as the plane of rotation.
B. At right angles to the plane of rotation.
C. In opposition to the direction of rotation.
7. The purpose of blade twist is to
A. reduce angle of attack at the blade root.
B. ensure that tip speed does not go faster than Mach 1.
C. even out thrust distribution across the propeller.
8. When is thrust greatest?
A. At 70 to 80% of propeller length.
B. In the first 50%.
C. At the same all along the length.
9. CTM changes the pitch of a blade
A. about its twisting axis.
B. bending forward.
C. towards the feather plane.
Page 1 of 10
, MODULE: 17- PROPELLER
CATEGORY: B1.1
17.2 PROPELLER CONSTRUCTION
10. The timber is often used today in propeller construction is
A. birch.
B. spruce.
C. balsa.
11. The metal that is at the tip and along the leading edge of a wooden propeller is for
A. balancing.
B. protection.
C. Anti-icing.
12. Blade cuffs are fitted to the root of the blades
A. to increase the strength of the blade.
B. to increase thrust.
C. to increase flow of cooling air into the engine nacelle.
13. A propeller is centralised on the propeller shaft by
A. the front and rear cones.
B. the front git seal.
C. the rear pre-load shims.
14. Reduction gearing allows the blade tips to
A. operate below the speed of sound.
B. operate above the speed of sound.
C. rotate slower than the root of the propeller blade.
15. A ducted propeller is used because
A. ducted props give more thrust for the diameter of disc.
B. only ducted props can be vectored.
C. ducted props give less thrust for the diameter of disc.
16. A two positions propeller uses.
A. high pitch for take off and low pitch for cruise.
B. low pitch for take off and climb and high pitch for cruise.
C. high pitch for take off and cruise and low pitch for climb and descent.
17. Solidity of a propeller can be increased by increasing
A. blade chord.
B. blade angle.
C. blade thickness.
Page 2 of 10
