quiz 1

Question 1

It is normally consists of two or more blades attached to the central hub which is mounted to an engine crankshaft.

Answer 1

propeller

Question 2

are usually a rotating wings, that have a leading edge, trailing edge, tip, shank, face, and back.

Answer 2

Blades

Question 3

An angle between the plane of rotation and the chord line.

Answer 3

Propeller Blade Angle

Question 4

A reference position on a blade that is a specified distance from the center of the hub.

Answer 4

Blade Station

Question 5

It is the distance that a propeller section Will move forward in one revolution.

Answer 5

Pitch

Question 6

Is the gradual twist In the propeller blade from shank to tip.

Answer 6

Pitch Distribution

Question 7

Types of Propellers

Answer 7

Fixed-Pitch Propellers
Ground Adjustable Propellers
Two-Position Propeller
Controllable Pitch Propellers
Constant – Speed Propeller
Automatic Pitch Control

Question 8

Simplest of propeller designs and is associated with many light, piston engine aircraft.

Answer 8

Fixed-Pitch Propellers

Question 9

Propellers are similar to fixed pitch propellers In that their blade angles cannot be changed In flight

Answer 9

Ground Adjustable Propellers

Question 10

Is a design that allows the pilot to select one of two blade angles while to flight, allowing (the use of a low blade angle for takeoff and a high blade angle for cruise).

Answer 10

Two-Position Propeller

Question 11

were designed to give the pilot the ability to set the blades at any angle on the propeller’s range while in flight, giving the pilot more control over the propeller- than the two-position design.

Answer 11

Controllable Pitch Propellers

Question 12

This propeller is not controllable by the pilot. Instead. it will theoretically set the propeller blades at the most efficient angle by reacting lo forces generated by engine thrust torque, and airspeed.

Answer 12

Automatic Pitch Control

Question 13

This propeller system uses a controllable propeller which the pilot Indirectly controls by adjusting a constant-speed control unit commonly called the governor.

Answer 13

Constant – Speed Propeller

Question 14

The amount of lift produced depends on the:

Answer 14

Airfoil Shape
RPM
Angle of Attack

Question 15

, Changes in airfoil shape and Blade angle

Answer 15

Propeller Pitch Distribution

Question 16

The blade angle near the center of the propeller will be_____________ toward the tip. ()

Answer 16

highest with a decrease in blade angle

Question 17

1.______airfoils near the hub and 2._______ airfoils toward the tip.

Answer 17

1.Low speed
2.high-speed

Question 18

The pitch distribution and the change in airfoil shape along the length of the blade are necessary because:

Answer 18

each section is moving at a different velocity With the. slowest speeds near the hub and the highest speeds near the Up.

Question 19

Is the angle between the airfoil chord line and the relative wind.

Answer 19

AOA (Angle of Attack)

Question 20

Five Operational Forces

Answer 20

centrifugal force
torque bending force
thrust bending force
aerodynamic twisting force
centrifugal twisting force

Question 21

The force which causes the greatest stress on a propeller.

Answer 21

Centrifugal Force

Question 22

Tends to bend the propeller blades forward at the tips because the lift toward the tip of the blade flexes the thin blade sections forward.

Answer 22

Thrust Bending Force

Question 23

Is a force which tends to bend the propeller blade back in the direction opposite of rotation.
Air resistance opposes the rotation of the blade

Answer 23

Torque Bending Force

Question 24

Tries to twist the a blade to a higher angle by aerodynamic action.

Answer 24

Aerodynamic Twisting Moment

Question 25

Tends to decrease the blade angle and opposes aerodynamic twisting moment.

Answer 25

Centrifugal Twisting Moment

Question 26

Propeller produces thrust which the aerodynamic and mechanical forces are present that cause the blades to vibrate.

Answer 26

Vibrational Force and Critical Range