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Powerplant > Propellers > Flashcards

Propellers Flashcards

1
Q

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

A

Brushes & Slip Rings

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2
Q

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

A

Centrifugal Force

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3
Q

Propeller fluid anti-icing systems generally use what?

A

Isopropyl Alcohol

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4
Q

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

A

Decrease in Thrust & Excessive Vibration

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5
Q

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

A

Rheostat

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6
Q

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

A

Adjusting the phase angle between the propellers on aircraft engine

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7
Q

What determines oil and grease specifications for lubrication of propellers?

A

Propeller’s Manufacture

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8
Q

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?

A

Vertical Imbalance

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9
Q

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

A

Supports the propeller on the balancing Knives

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10
Q

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

A

Achieve final balancing by applying protective coatings to the light blade

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11
Q

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

A

Greater at Higher RPM

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12
Q

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

A

Add or Remove Solder from the Blade Tip

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13
Q

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

A

is equal to the speeder spring force

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14
Q

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

A

Governor Flyweights

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15
Q

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

A

Overspeed

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16
Q

What operational force tends to increase propeller blade angle?

A

Aerodynamic Twisting Force

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17
Q

Which function requires the use of a propeller blade station?

A

Measure of Blade Angles

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18
Q

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

A

High Speed, High Altitude Cruising Flight

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19
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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20
Q

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

A

Pitch Changing Oil

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21
Q

The thrust produced by a rotating propeller is a result of

A

Area of decreased pressure immediately in front of propeller blade

22
Q

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

A

Propeller feathering pump motor

23
Q

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

A

Chord of the blade at a specified station

24
Q

Propeller blade station numbers increase from

A

Hub Center to Centerline of Tip

25
Q

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

A

Low Pitch, High Pitch, Feather Position

26
Q

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

A

Counterweight Assemblies

27
Q

The primary purpose of a cuff on a propeller is to

A

Increase the flow of cool air to the engine nacelle

28
Q

The purpose of a three-way propeller valve is to

A

Directs oil from the engine oil system to propeller cylinder

29
Q

Geometric pitch of a propeller is defined as the

A

Effective Pitch + Slippage

30
Q

Propeller blade angle is the angle between the

A

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

31
Q

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

A

Torque Bending

32
Q

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

A

Thrust Bending

33
Q

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

A

Low Blade Angle, High RPM

34
Q

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

A

Oil Pressure

35
Q

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

A

Increasing blade angle

36
Q

The primary purpose of a feathering propeller is to

A

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

37
Q

How do you correct front cone bottoming?

A

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

38
Q

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

A

To allow moisture between the tipping & the wood to escape

39
Q

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

A

Blade Shanks

40
Q

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

A

Eliminate Stress on concentration points

41
Q

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

A

Parallel to the length of the blade

42
Q

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

A

Mild Soap & Water

43
Q

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

A

Dye Penetrant

44
Q

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

A

A Major Repair

45
Q

What defect generally renders an aluminum alloy propeller unrepairable?

A

Traverse cracks of any size will render a propeller unrepairable

46
Q

Centrifugal Force is

A

A physical force that pulls the blades outward from the hub

47
Q

The smallest increment you can measure with a propeller protractor?

A

Tenth of a degree

48
Q

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

A

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

49
Q

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

A

high pitch stops & spring loaded latches

50
Q

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

A

Propeller Pitch Control forward, then throttle

Powerplant (18 decks)

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