Props

Question 1

The thrust produced by a rotating propeller is a result of which condition?

Answer 1

An area of low pressure in front of the propeller blades.

Question 2

Define propeller blade angle

Answer 2

The angle formed between the chord of the blade and the plane of rotation

Question 3

Define propeller blade angle of attack

Answer 3

The angle formed between the chord of the blade and the relative wind.

Question 4

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

Answer 4

Effective Pitch

Question 5

Geometric pitch of a propeller is defined as-

Answer 5

Effective pitch plus slippage.

Question 6

What operational force causes the greatest stress on a propeller?

Answer 6

Centrifugal Force

Question 7

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

Answer 7

Thrust-bending Force

Question 8

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

Answer 8

Torque bending force

Question 9

What operational force tends to increase the pitch angle?

Answer 9

Aerodynamic Twisting Force

Question 10

Propeller blade station numbers increase from?

Answer 10

Hub to tip

Question 11

Which of the following functions require the use of a propeller blade station?

Answer 11

Measuring propeller blade angle.

Question 12

What is the smallest increment that can be measured with a prop protractor?

Answer 12

1/10 of a degree

Question 13

What is the primary purpose of a cuff on a propeller blade?

Answer 13

Increase the flow of cooling air to the engine nacelle.

Question 14

What is the purpose of the three small holes in the tipping of wood propeller blades?

Answer 14

To allow the moisture between the tipping and the wood to escape/vent.

Question 15

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

Answer 15

In the counterweight assembly.

Question 16

The effect of an unbalanced propeller will be?

Answer 16

Greater at high RPM

Question 17

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

Answer 17

To support the propeller on the balancing knives.

Question 18

What type of imbalance will cause a two-blade propeller to come to rest in a horizontal position while being checked on a balancing beam?

Answer 18

Vertical

Question 19

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

Answer 19

Solder

Question 20

The application of more protective coating on one blade than the other when refinishing a wood propeller is done for what reason?

Answer 20

To achieve final balancing

Question 21

Whatis the primary purpose of a feathering propeller?

Answer 21

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

Question 22

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

Answer 22

Low pitch through high pitch to feather position.

Question 23

During operationa/ check of an aircraft using a hydromatic full-feathering propeller, the feather button, after being pushed:

Answer 23

Remains depressed until the feather cycle is complete, then opens.

Question 24

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

Answer 24

A latch mechanism composed of springs and lock pins

Question 25

How does a propeller synchrophasing system allow a pilot to reduce noise and vibration?

Answer 25

Adjusting the phase angles between the propellers on the aircraft's engines.

Question 26

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

Answer 26

Decrease thrust and cause excessive vibration.

Question 27

Propeller fluid ant-icing-sistems generally use which of the following?

Answer 27

Isopropyl alcohol

Question 28

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

Answer 28

Centrifugal force

Question 29

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

Answer 29

Rheostat

Question 30

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

Answer 30

By slip rings and brushes

Question 31

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

Answer 31

Governor flyweights

Question 32

During the on-speed condition of a propeller

Answer 32

the centrifugal force of the governor flyweights is equal to the speeder spring force.

Question 33

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

Answer 33

Over speed

Question 34

Constant-speed non-feathering propellers without counterweights increase pitch angle using

Answer 34

Oil pressure

Question 35

Counterweights on constant-speed featherable propellers are used for

Answer 35

Increasing blade angle

Question 36

To increase power without damaging a reciprocating engine, which of the controls should be advanced first, the Throttle or Propeller Pitch Control?

Answer 36

Increase propeller pitch control than throttle.

Question 37

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

Answer 37

High speed and low pitch angle

Question 38

During what phase of flight will the blade angle of a constant-speed propeller be the greatest

Answer 38

High altitude cruise

Question 39

What is the result of moving the throttle on a reciprocating engine when the propeller is in the constant-speed range with the engine developing cruise power?

Answer 39

Opening the throttle will cause an increase in blade angle.

Question 40

What unit directs oil to and from the cylinder on the Hamilton Standard two-position counterweight propeller?

Answer 40

3 way valve

Question 41

For what reason is it important to repair nicks in aluminum alloy propeller blades as soon as possible?

Answer 41

Eliminate stress concentration points

Question 42

Repairs of nicks, scratches, and gouges on aluminum blades must be made in which manner?

Answer 42

Parallel to length of the blade

Question 43

Which of the following generally renders an aluminum alloy propeller unrepairable?

Answer 43

Transverse cracks of any size

Question 44

When preparing a propeller blade for inspection it should be cleaned with which of the following?

Answer 44

Mild soap and water

Question 45

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

Answer 45

Dye penetrant

Question 46

Removal of propeller blade tips within the Type Certificate Data Sheet limits when correcting a defect is

Answer 46

A major repair

Question 47

Repairs of aluminum alloy adjustable pitch propeller blades are not permitted in which area?

Answer 47

Shank

Question 48

How can front cone bottoming be corrected on a splined shaft installation?

Answer 48

By using a spacer behind the rear cone

Question 49

Which of the following determines oil and grease specifications for lubrication of propellers?

Answer 49

Propeller manufacturer

Question 50

How is the pitch-changing mechanism of a hydromatic propeller lubricated?

Answer 50

With the pitch changing oil