Propellers

Question 1

How is aircraft electrical power for propeller de-icer systems transferred from the engine to propeller hub assembly?

Answer 1

Brushes & Slip Rings

Question 2

How is anti-icing fluid ejected from the slinger ring on a propeller?

Answer 2

Centrifugal Force

Question 3

Propeller fluid anti-icing systems generally use what?

Answer 3

Isopropyl Alcohol

Question 4

Ice formation on propellers, when an aircraft is in flight, will cause what?

Answer 4

Decrease in Thrust & Excessive Vibration

Question 5

What unit (component) in the propeller anti-icing system controls the output of the pump?

Answer 5

Rheostat

Question 6

A propeller synchrophasing system allows a pilot to reduce noise and vibration by

Answer 6

Adjusting the phase angle between the propellers on aircraft engine

Question 7

What determines oil and grease specifications for lubrication of propellers?

Answer 7

Propeller’s Manufacture

Question 8

What type of imbalance will cause a two-blade propeller to have a persistent tendency to come to rest in a horizontal position (with the blades parallel to the ground) while being checked on a propeller balancing beam?

Answer 8

Vertical Imbalance

Question 9

What is the purpose of an ARBOR used in balancing a propeller?

Answer 9

Supports the propeller on the balancing Knives

Question 10

The application of more protective coating on one blade than the other when refinishing a wood propeller is to…

Answer 10

Achieve final balancing by applying protective coatings to the light blade

Question 11

Apparent engine roughness is often a result of propeller unbalance. The effect of an unbalanced propeller will usually be

Answer 11

Greater at Higher RPM

Question 12

Which of the following is used to correct horizontal unbalance of a wood propeller?

Answer 12

Add or Remove Solder from the Blade Tip

Question 13

During the on-speed condition of a propeller, the position of the flyweights

Answer 13

is equal to the speeder spring force

Question 14

What actuates the pilot valve in the governor of a constant-speed propeller?

Answer 14

Governor Flyweights

Question 15

When the centrifugal force acting on the propeller governor flyweight overcomes the tension on the speeder spring, a propeller is in what speed condition?

Answer 15

Overspeed

Question 16

What operational force tends to increase propeller blade angle?

Answer 16

Aerodynamic Twisting Force

Question 17

Which function requires the use of a propeller blade station?

Answer 17

Measure of Blade Angles

Question 18

During which of the following conditions of flight will the blade pitch angle of a constant-speed propeller be greatest?

Answer 18

High Speed, High Altitude Cruising Flight

Question 19

The actual distance a propeller moves forward through the air during one revolution is known as the

Answer 19

Effective Pitch

Question 20

The pitch-changing mechanism of the hydromatic propeller is lubricated by

Answer 20

Pitch Changing Oil

Question 21

The thrust produced by a rotating propeller is a result of

Answer 21

Area of decreased pressure immediately in front of propeller blade

Question 22

The holding coil on a hydromatic propeller feathering button switch holds a solenoid relay closed that applies power to the what?

Answer 22

Propeller feathering pump motor

Question 23

Blade angle is an angle formed by a line perpendicular to the crankshaft and a line formed by the

Answer 23

Chord of the blade at a specified station

Question 24

Propeller blade station numbers increase from

Answer 24

Hub Center to Centerline of Tip

Question 25

What best describes the blade movement of a feathering propeller that is in the HIGH RPM position when the feathering action is begun?

Answer 25

Low Pitch, High Pitch, Feather Position

Question 26

Where are the high and low pitch stops of a Hamilton Standard constant-speed or two-position counterweight propeller located?

Answer 26

Counterweight Assemblies

Question 27

The primary purpose of a cuff on a propeller is to

Answer 27

Increase the flow of cool air to the engine nacelle

Question 28

The purpose of a three-way propeller valve is to

Answer 28

Directs oil from the engine oil system to propeller cylinder

Question 29

Geometric pitch of a propeller is defined as the

Answer 29

Effective Pitch + Slippage

Question 30

Propeller blade angle is the angle between the

Answer 30

horizontal plane of rotation of the rotor disc and the chord line of the airfoil

Question 31

What operational force causes the propeller blade tips to lag in the opposite direction of rotation?

Answer 31

Torque Bending

Question 32

What operational force tends to bend the propeller blades forward at the tip?

Answer 32

Thrust Bending

Question 33

What are the rotational speed and blade pitch angle requirements of a constant-speed propeller during takeoff?

Answer 33

Low Blade Angle, High RPM

Question 34

Constant-speed non-feathering McCauley, Hartzell, and other propeller of similar design without counterweight increase pitch angle using

Answer 34

Oil Pressure

Question 35

Counterweights on constant-speed propellers are generally used to aid in

Answer 35

Increasing blade angle

Question 36

The primary purpose of a feathering propeller is to

Answer 36

Eliminate the drag created by a windmilling propeller when an engine fails in flight

Question 37

How do you correct front cone bottoming?

Answer 37

Place a thick steel spacer (shim) behind the rear cone.

Question 38

What is the basic purpose of the three small holes (No.60 drill) in the tipping of wood propeller blades?

Answer 38

To allow moisture between the tipping & the wood to escape

Question 39

Repairs of aluminum alloy adjustable pitch propeller are not permitted to be made on what propeller blade area?

Answer 39

Blade Shanks

Question 40

It is important that nicks in aluminum alloy propeller blades be repaired as soon as possible in order to

Answer 40

Eliminate Stress on concentration points

Question 41

Generally, unless otherwise specified by the manufacturer, repairs of nicks, scratches, gouges, etc. on aluminum propeller blades must be made

Answer 41

Parallel to the length of the blade

Question 42

When preparing a propeller blade for inspection it should be cleaned with

Answer 42

Mild Soap & Water

Question 43

What method would be used to inspect an aluminum propeller blade when a crack is suspected?

Answer 43

Dye Penetrant

Question 44

Removal of propeller blade tips within Type Certificate Data Sheet limits when correcting a defect is considered to be…

Answer 44

A Major Repair

Question 45

What defect generally renders an aluminum alloy propeller unrepairable?

Answer 45

Traverse cracks of any size will render a propeller unrepairable

Question 46

Centrifugal Force is

Answer 46

A physical force that pulls the blades outward from the hub

Question 47

The smallest increment you can measure with a propeller protractor?

Answer 47

Tenth of a degree

Question 48

When engine power is increased, the constant-speed propeller tries to function so that it will…

Answer 48

increase blade angle in order to maintain constant RPM & maintain low angle of attack & increase airspeed

Question 49

What normally prevents Hartzell Compact propeller from going to feather when an engine is shut down on the ground

Answer 49

high pitch stops & spring loaded latches

Question 50

To increase power without damaging a reciprocating engine, which control should be advanced first?

Answer 50

Propeller Pitch Control forward, then throttle