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Propellers > Props > Flashcards

Props Flashcards

1
Q

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

A

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

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2
Q

Define propeller blade angle

A

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

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3
Q

Define propeller blade angle of attack

A

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

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4
Q

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

A

Effective Pitch

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5
Q

Geometric pitch of a propeller is defined as-

A

Effective pitch plus slippage.

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6
Q

What operational force causes the greatest stress on a propeller?

A

Centrifugal Force

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7
Q

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

A

Thrust-bending Force

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8
Q

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

A

Torque bending force

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9
Q

What operational force tends to increase the pitch angle?

A

Aerodynamic Twisting Force

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10
Q

Propeller blade station numbers increase from?

A

Hub to tip

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11
Q

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

A

Measuring propeller blade angle.

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12
Q

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

A

1/10 of a degree

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13
Q

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

A

Increase the flow of cooling air to the engine nacelle.

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14
Q

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

A

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

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15
Q

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

A

In the counterweight assembly.

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16
Q

The effect of an unbalanced propeller will be?

A

Greater at high RPM

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17
Q

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

A

To support the propeller on the balancing knives.

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18
Q

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?

A

Vertical

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19
Q

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

A

Solder

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20
Q

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

A

To achieve final balancing

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21
Q

Whatis the primary purpose of a feathering propeller?

A

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

22
Q

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?

A

Low pitch through high pitch to feather position.

23
Q

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

A

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

24
Q

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

A

A latch mechanism composed of springs and lock pins

25
Q

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

A

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

26
Q

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

A

Decrease thrust and cause excessive vibration.

27
Q

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

A

Isopropyl alcohol

28
Q

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

A

Centrifugal force

29
Q

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

A

Rheostat

30
Q

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

A

By slip rings and brushes

31
Q

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

A

Governor flyweights

32
Q

During the on-speed condition of a propeller

A

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

33
Q

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

A

Over speed

34
Q

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

A

Oil pressure

35
Q

Counterweights on constant-speed featherable propellers are used for

A

Increasing blade angle

36
Q

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

A

Increase propeller pitch control than throttle.

37
Q

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

A

High speed and low pitch angle

38
Q

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

A

High altitude cruise

39
Q

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?

A

Opening the throttle will cause an increase in blade angle.

40
Q

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

A

3 way valve

41
Q

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

A

Eliminate stress concentration points

42
Q

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

A

Parallel to length of the blade

43
Q

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

A

Transverse cracks of any size

44
Q

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

A

Mild soap and water

45
Q

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

A

Dye penetrant

46
Q

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

A

A major repair

47
Q

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

A

Shank

48
Q

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

A

By using a spacer behind the rear cone

49
Q

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

A

Propeller manufacturer

50
Q

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

A

With the pitch changing oil

Propellers (1 decks)

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