Midterm

Question 1

A device for converting engine horsepower into usable thrust

Answer 1

propeller

Question 2

A propeller used on light aircraft, whose blade angles cannot be changed

Answer 2

fixed pitch propeller

Question 3

a propeller whose pitch can be changed in flight by the pilot’s control lever or switch

Answer 3

controllable-pitch propeller

Question 4

the angle between the blade section chord line and the plane of rotation of the propeller

Answer 4

blade angle

Question 5

a system which uses a governor to adjust the propeller blade angle maintain a selected RPM

Answer 5

constant-speed propeller system

Question 6

the rotation of the propeller blades to an angle of about 90 degrees which will eliminate the drag of a windmilling propeller

Answer 6

feather

Question 7

rotating of the propeller blades to a negative angle to produce a braking or reversing thrust

Answer 7

reversing

Question 8

one arm of a propeller from the hub to the tip

Answer 8

blade

Question 9

the central portion of a propeller which is fitted to the engine crankshaft and carries the blades

Answer 9

hub

Question 10

forward edge of the propeller blade

Answer 10

leading edge

Question 11

the curved side of a propeller airfoil section the can be seen while standing in front of the airplane

Answer 11

back

Question 12

the plane in which the propeller rotates, 90 degrees to the crankshaft centerline

Answer 12

plane of rotation

Question 13

the imaginary line which extends from the leading edge to the trailing edge of a blade airfoil section

Answer 13

chord line

Question 14

a distance from the center of the propeller hub measured in inches

Answer 14

blade station

Question 15

the same as geometric pitch. Often used interchangeably with blade angle

Answer 15

pitch

Question 16

the twist in a propeller blade along its length

Answer 16

pitch distribution

Question 17

a propeller which can be adjusted on the ground to change the blade angles

Answer 17

ground adjustable propeller

Question 18

the propeller control device in a constant-speed system

Answer 18

governor

Question 19

What is the smallest division that can be read with a propeller protactor?

Answer 19

tenths of a degree

Question 20

What should be the condition of the cockpit controls before working near a propeller?

Answer 20

Magneto switch is off and key is removed from the switch. Mixture control is in the idle cutoff position and master switch is in the off position.

Question 21

Which FAR defines the different classes of maintenance for the propeller systems?

Answer 21

FAR Part 43

Question 22

What information is required to be on the hub or clade butt of a propeller?

Answer 22

Builder’s name, model designation, serial number, type certificate number, and production certificate number

Question 23

What is the minimum ground clearance for the propeller on a tricycle-geared aircraft?

Answer 23

7 inches

Question 24

the angle between the chord line of a propeller blade section and the relative wind

Answer 24

angle of attack

Question 25

the force which tries to pull the blades of the hub

Answer 25

centrifugal force

Question 26

force that tends to bend the propeller blades forward at the tips

Answer 26

thrust bending force

Question 27

force which tends to bend the propeller blade back in the direction opposite to the direction of rotation

Answer 27

torque bending force

Question 28

force that tends to increase the propeller blade angle

Answer 28

aerodynamic twisting moment

Question 29

force that tends to decrease blade angle and opposes aerodynamic twisting moment

Answer 29

centrifugal twisting moment

Question 30

the rpm range at which destructive harmonic vibrations exist

Answer 30

critical range

Question 31

the theoretical distance that an aircraft will move forward in one revolution of the propeller

Answer 31

geometric pitch

Question 32

the distance forward that an aircraft actually moves in one revolution of the propeller

Answer 32

effective pitch

Question 33

the difference between geometric and effective pitch

Answer 33

slip

Question 34

a crankshaft whose propeller mounting surface forms a flat plate 90 degrees to the shaft centerline, med hp engine

Answer 34

flanged

Question 35

a cylindrical-shaped crankshaft extension which has splines on its surface to prevent propeller rotation on the shaft, high hp engines

Answer 35

splined

Question 36

a crankshaft design whose propeller-mounting surface tapers to a smaller diameter and acts like a cone seating surface, low hp engines

Answer 36

tapered