BLADES AND PROEP (key)

Question 1. A propeller synchrophasing system allows a pilot to reduce noise and vibration by

 

Setting the pitch angle of all propellers exactly the same.

Adjusting the phase angle between the propellers on an aircraft's engines.

Adjusting the plane of rotation of all propellers.

Adjusting the phase angle between the propellers on an aircraft's engines.

Question 2. (1) A mechanic certificate with a powerplant rating authorizes the holder to repair deep scars, nicks, and dents on aluminum propeller blades.

(2) A mechanic certificate with a powerplant rating authorizes the holder to perform minor straightening of steel propeller blades. Regarding the above statements,

 

A.  Neither No. 1 nor No. 2 is true.

B.  Only No. 1 is true.

C.  Both No. 1 and No. 2 are true.

A.  Neither No. 1 nor No. 2 is true.

Question 3. The purpose of permanently sealing and partially filling some models of McCauley propeller hubs with dyed oil is to

 

A.  Provide an always clean separate lubrication of the internal parts.

B.  Dampen pressure surges and prevent too rapid changes in propeller blade angle.

C.  Make the location of cracks readily apparent.

C.  Make the location of cracks readily apparent.

Question 4. Inspection of propeller blades by dye-penetrant inspection is accomplished to detect

 

A.  Fatigue failure or cracks

B.  Material de-bond

C.  Torsional stress

A.  Fatigue failure or cracks

Question 5. What actuates the pilot valve in the governor of a constant-speed propeller?

 

A.  Governor flyweights

B.  Engine oil pressure

C.  Governor pump oil pressure

A.  Governor flyweights

Question 6. Which of the following determines oil and grease specifications for lubrication of propellers?

 

A.  Engine manufacturer's instructions

B.  Lubricant manufacturer's instructions

C.  Propeller manufacturer's instructions

C.  Propeller manufacturer's instructions

Question 7. When the centrifugal force acting on the propeller governor flyweights overcomes the tension on the speeder spring, a propeller is in what speed condition?

 

A.  On speed

B.  Underspeed

C.  Overspeed

C.  Overspeed

Question 8. Propeller blade stations are measured from the

 

A.  Hub centerline

B.  Blade base

C.  Index mark on the blade shank

A.  Hub centerline

Question 9. The centrifugal twisting moment of an operating propeller tends to

 

A.  Bend the blades in the direction of rotation.

B.  Reduce the pitch angle.

C.  Increase the pitch angle.

B.  Reduce the pitch angle.

Question 10. Geometric pitch of a propeller is defined as the

 

A.  Effective pitch plus slippage.

B.  Effective pitch minus slippage.

C.  Angle between the blade chord and the plane of rotation.

A.  Effective pitch plus slippage.

Question 11. How can a steel propeller hub be tested for cracks?

 

A.  By anodizing.

B.  By magnetic particle inspection.

C.  By etching.

B.  By magnetic particle inspection.

Question 12. What controls the constant-speed range of a constant-speed propeller?

 

A.  The mechanical limits in the propeller pitch range.

B.  Engine RPM.

C.  Angle of climb and descent with accompanying changes in airspeed.

A.  The mechanical limits in the propeller pitch range.

Question 13. 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.

B.  So as to return the damaged area to the original dimensions.

C.  Perpendicular to the blade axis.

A.  Parallel to the length of the blade.

Question 14. Propeller blade tracking is the process of determining

 

A.  The positions of the tips of the propeller blades relative to each other.

B.  That the blade angles are within the specified tolerance of each other.

C.  The plane of rotation of the propeller with respect to the aircraft longitudinal axis.

A.  The positions of the tips of the propeller blades relative to each other.

Question 15. For takeoff, a constant-speed propeller is normally set in the

 

A.  LOW PITCH, high RPM position

B.  HIGH PITCH, low RPM position

C.  HIGH PITCH, high RPM position

A.  LOW PITCH, high RPM position

Question 16. Propellers exposed to salt spray should be flushed with

 

A.  Fresh water

B.  Stoddard solvent

C.  Soapy water

A.  Fresh water

Question 17. Which of the following forces or combination of forces operates to move the blades of a constant-speed counterweight-type propeller to the HIGH PITCH position?

 

A.  Centrifugal force acting on the counterweights.

B.  Prop governor oil pressure acting on the propeller piston-cylinder arrangement.

C.  Engine oil pressure acting on the propeller piston-cylinder arrangement and centrifugal force acting on the counterweights.

A.  Centrifugal force acting on the counterweights.

Question 18. Manually feathering a hydromechanical propeller means to

 

A.  Block governor oil pressure to the cylinder of the propeller.

B.  Port governor oil pressure from the cylinder of the propeller.

C.  Port governor oil pressure to the cylinder of the propeller.

B.  Port governor oil pressure from the cylinder of the propeller.

Question 19.

(1) During takeoff, propeller thrust (pull) is greatest if the blade angle of attack is low and the engine power setting is high.

(2) With the aircraft stationary, propeller thrust is greatest if the blade angle of attack is high and the engine power setting is high. Regarding the above statements,

 

A.  Only No. 1 is true.

B.  Both No. 1 and No. 2 are true.

C.  Only No. 2 is true.

A.  Only No. 1 is true.

Question 20. How is aircraft electrical power for propeller deicer systems transferred from the engine to the propeller hub assembly?

 

A.  By slip rings and brushes.

B.  By slip rings and segment plates.

C.  By flexible electrical connectors.

A.  By slip rings and brushes.

Question 21. How does the aerodynamic twisting force affect operating propeller blades?

 

A.  It tends to turn the blades to a low blade angle

B.  It tends to bend the blades forward.

C.  It tends to turn the blades to a high blade angle.

C.  It tends to turn the blades to a high blade angle.

Question 22. A powerplant using a hydraulically controlled constant-speed propeller is operating within the propeller’s constant-speed range at a fixed throttle setting. If the tension of the propeller governor control spring (speeder spring) is reduced by movement of the cockpit propeller control, the propeller blade angle will

 

A.  Decrease, engine manifold pressure will increase, and engine RPM will decrease.

B.  Decrease, engine manifold pressure will decrease, and engine RPM will increase.

C.  Increase, engine manifold pressure will increase, and engine RPM will decrease.

C.  Increase, engine manifold pressure will increase, and engine RPM will decrease.

Question 23. Most engine-propeller combinations have one or more critical ranges within which continuous operation is not permitted. Critical ranges are established to avoid

 

A.  Low or negative thrust conditions

B.  Inefficient propeller pitch angles

C.  Severe propeller vibration

C.  Severe propeller vibration

Question 24. Constant-speed non-feathering McCauley, Hartzell, and other propellers of similar design without counterweights increase pitch angle using

 

A.  Oil pressure

B.  Centrifugal twisting moment

C.  Spring pressure

A.  Oil pressure

Question 25. The low pitch stop on a constant-speed propeller is usually set so that

 

A.  Maximum allowable engine RPM cannot be exceeded with any combination of manifold pressure, altitude, or forward speed.

B.  The engine will turn at its rated takeoff RPM at sea level when the throttle is opened to allowable takeoff manifold pressure.

C.  The limiting engine manifold pressure cannot be exceeded with any combination of throttle opening, altitude, or forward speed.

B.  The engine will turn at its rated takeoff RPM at sea level when the throttle is opened to allowable takeoff manifold pressure.

Question 26. Grease used in aircraft propellers reduces the frictional resistance of moving parts and is easily molded into any form under pressure. This statement defines

 

A.  Antifriction and plasticity characteristics of grease.

B.  Viscosity and melting point of grease.

C.  Antifriction and chemical stability of grease.

A.  Antifriction and plasticity characteristics of grease.

Question 27. Propeller blade angle is the angle between the

 

A.  Relative wind and the rotational plane of the propeller.

B.  Chord of the blade and the rotational plane of the propeller.

C.  Chord of the blade and the relative wind.

A.  Relative wind and the rotational plane of the propeller.

Question 28. Which of the following generally renders an aluminum alloy propeller unrepairable?

 

A.  Blade face surface damage.

B.  Leading or trailing edge damage

C.  Transverse cracks of any size.

C.  Transverse cracks of any size.

Question 29. The actual distance a propeller moves forward through the air during one revolution is known as the

 

A.  Geometric pitch

B.  Relative pitch

C.  Effective pitch

C.  Effective pitch

Question 30. On aircraft equipped with hydraulically operated constant-speed propellers, all ignition and magneto checking is done with the propeller in which position?

 

A.  Low RPM

B.  High RPM

C.  High pitch range

B.  High RPM

Question 31. Propeller fluid anti-icing systems generally use which of the following?

 

A.  Isopropyl alcohol

B.  Ethylene glycol

C.  Ethyl alcohol

A.  Isopropyl alcohol

Question 32. It is important that nicks in aluminum alloy propeller blades be repaired as soon as possible in order to

 

A.  Equalize the centrifugal loads between the blades.

B.  Maintain equal aerodynamic characteristics between the blades.

C.  Eliminate stress concentration points.

C.  Eliminate stress concentration points.

Question 33. Which of the following best describes the blade movement of a feathering propeller that is in the HIGH RPM position when the feathering action is begun?

 

A.  High pitch through low pitch to feather position.

B.  Low pitch through reverse pitch to feather position.

C.  Low pitch through high pitch to feather position.

C.  Low pitch through high pitch to feather position.

Question 34. Surface treatment to counter the effects of dye-penetrant inspection on a propeller is accomplished by

 

A.  Wiping with alcohol.

B.  Rinse the blade in alodine solution.

C.  Washing off with solvent.

C.  Washing off with solvent.

Question 35. During which of the following conditions of flight will the blade pitch angle of a constant-speed propeller be the greatest?

 

A.  High-speed, high-altitude cruising flight.

B.  Approach to landing.

C.  Climb following takeoff.

A.  High-speed, high-altitude cruising flight.

Question 36. Longitudinal (fore and aft) clearance of constant-speed propeller blades or cuffs must be at least 1/2 inch (12.7 mm) between propeller parts and stationary parts of the aircraft. This clearance is with the propeller blades

 

A.  Feathered or in the most critical pitch configuration.

B.  At takeoff pitch (maximum thrust) angle.

C.  At the lowest pitch angle.

A.  Feathered or in the most critical pitch configuration.

Question 37. The application of more protective coating on one blade than the other when refinishing a wood propeller

 

A.  May be necessary to achieve final balancing.

B.  Should never be done.

C.  Has little or no effect on operating characteristics.

A.  May be necessary to achieve final balancing.

Question 38. When engine power is increased, the constant-speed propeller tries to function so that it will

 

A.  Maintain the RPM, decrease the blade angle, and maintain a low angle of attack. ®

B.  Increase the RPM, decrease the blade angle, and maintain a low angle of attack.

C.  Maintain the RPM, increase the blade angle, and maintain a low angle of attack.

C.  Maintain the RPM, increase the blade angle, and maintain a low angle of attack.

Question 39. If propeller cones or hub cone seats show evidence of galling and wear, the most likely cause is

 

A.  The front cone was not fully bottomed against the crankshaft splines during installation

B.  The propeller retaining nut was not tight enough during the previous operation.

C.  The pitch change stops were located incorrectly, causing the cone seats to act as the high pitch stop.

B.  The propeller retaining nut was not tight enough during the previous operation.

Question 40. What action takes place when the cockpit control lever for a hydromatic, constant- speed propeller is actuated?

 

A.  Compression of the speeder spring is changed.

B.  The governor bypass valve is positioned to direct oil pressure to the propeller dome.

C.  The governor booster pump pressure is varied.

A.  Compression of the speeder spring is changed.

Question 41. An aircraft's propeller system beta range

 

A.  Is used to produce zero or negative thrust.

B.  Is used to achieve maximum thrust during takeoff.

C.  Refers to the most fuel efficient pitch range to use at a given engine RPM

A.  Is used to produce zero or negative thrust.

Question 42. Which of the following methods is used to straighten a bent aluminum propeller blade that is within repairable limits?

 

A.  Careful heating to accomplish straightening, followed by heat treatment to restore original strength.

B.  Either hot or cold straightening, depending on the location and severity of damage.

C.  Cold straightening only.

C.  Cold straightening only.

Question 43. Repairs of aluminum alloy adjustable pitch propellers are not permitted to be made on which of the following propeller blade areas?

 

A.  Shank

B.  Face

C.  Back

Shank

Question 44. What is a function of the automatic propeller synchronizing system on multi-engine aircraft?

 

A.  To control the power output of all engines.

B.  To control the tip speed of all propellers.

C.  To control engine RPM and reduce vibration.

C.  To control engine RPM and reduce vibration.

Question 45. The propeller governor controls the

 

A.  Linkage and counterweights from moving in and out.

B.  Oil to and from the pitch changing mechanism.

C.  Spring tension on the boost pump speeder spring.

B.  Oil to and from the pitch changing mechanism.

Question 46. When preparing a propeller blade for inspection, it should be cleaned with

 

A.  Steel wool

B.  Methyl ethyl ketone

C.  Mild soap and water

C.  Mild soap and water

Question 47. How is the oil pressure delivery on a hydromatic propeller normally stopped after the blades have reached their full-feathered position?

 

A.  Electric cutout pressure switch.

B.  Stop lugs in the teeth of the rotating cam.

C.  Pulling out the feathering push button.

A.  Electric cutout pressure switch.

Question 48. Which of the following occurs to cause front cone bottoming during propeller installation?

 

A.  The front cone enters the front propeller hub cone seat at an angle causing the propeller retaining nut to appear tight when it is only partially tightened.

B.  The front cone becomes bottomed in the front propeller hub cone seat before the rear propeller hub cone seat has engaged the rear cone.

C.  The front cone contacts the ends of the shaft splines, preventing the front and rear cones from being tightened against the cone seats in the propeller hub.

C.  The front cone contacts the ends of the shaft splines, preventing the front and rear cones from being tightened against the cone seats in the propeller hub.

Question 49. The pitch-changing mechanism of the hydromatic propeller is lubricated by

 

A.  Using an approved-type grease in a grease gun at intervals prescribed by the propeller manufacturer.

B.  The pitch-changing oil.

C.  Thoroughly greasing, necessary only during propeller overhaul

B.  The pitch-changing oil.

Question 50. How is anti-icing fluid ejected from the slinger ring on a propeller?

 

A.  By pump pressure

B.  By centripetal force.

C.  By centrifugal force.

B.  By centripetal force.

Question 51. Proper operation of electric deicing boots on individual propeller blades may best be determined by

 

A.  Observing the ammeter or loadmeter for current flow.

B.  Feeling the sequence of boot heating and have an assistant observe the loadmeter indications.

C.  Feeling the boots to see if they are heating.

B.  Feeling the sequence of boot heating and have an assistant observe the loadmeter indications.

Question 52. The primary purpose of a propeller is to

 

A.  Create lift on the fixed airfoils of an aircraft.

B.  Provide static and dynamic stability of an aircraft in flight.

C.  Change engine horsepower to thrust.

C.  Change engine horsepower to thrust.

uestion 53. The centrifugal twisting force acting on a propeller blade is

 

A.  Greater than the aerodynamic twisting force and tends to move the blade to a higher angle.

B.  Greater than the aerodynamic twisting force and tends to move the blade to a lower angle.

C.  Less than the aerodynamic twisting force and tends to move the blade to a lower angle.

B.  Greater than the aerodynamic twisting force and tends to move the blade to a lower angle.

Question 54. A fixed-pitch wooden propeller that has been properly installed and the attachment bolts properly torqued exceeds the out-of-track allowance by 1/16 inch. The excessive out-of-track condition may be corrected by

 

A.  Discarding the propeller since out-of-track conditions cannot be corrected.

B.  Slightly over tightening the attachment bolts adjacent to the most foward blade.

C.  Placing shims between the inner flange and the propeller.

C.  Placing shims between the inner flange and the propeller.

Question 55. When lubricating a Hartzell propeller blade with grease, to prevent damage to the blade seals, the service manual may recommend on some models to

 

A.  Pump grease into both zerk fittings for the blade simultaneously.

B.  Remove one of the two zerk fittings for the blade and grease the blade through the remaining fitting.

C.  Remove the seals prior to greasing and reinstall them afterwards.

B.  Remove one of the two zerk fittings for the blade and grease the blade through the remaining fitting.

Question 56. The blade angle of a fixed-pitch propeller

 

A.  Is smallest at the tip.

B.  ls greatest at the tip.

C.  Increases in proportion to the distance each section is from the hub.

A.  Is smallest at the tip.

Question 57. When lubricating a newly overhauled steel hub propeller, you should lubricate the Propeller

 

A.  After 10 hours of operation.

B.  After one to two hours of operation.

C.  At the next 100-hour inspection.

B.  After one to two hours of operation.

Question 58. In what position is the constant-speed propeller control placed to check the magnetos?

 

A.  Full increase, low propeller blade pitch angle.

B.  Full increase, high propeller blade pitch angle.

C.  Full decrease, low propeller blade pitch angle.

A.  Full increase, low propeller blade pitch angle.

Question 59. During the on-speed condition of a propeller, the

 

A.  Centrifugal force acting on the governor flyweights is greater than the tension of the speeder spring.

B.  Tension on the speeder spring is less than the centrifugal force acting on the governor flyweights.

C.  Centrifugal force of the governor flyweights is equal to the speeder spring force.

C.  Centrifugal force of the governor flyweights is equal to the speeder spring force.

Question 60. Counterweights on constant-speed propellers are generally used to aid in

 

A.  Increasing blade angle

B.  Decreasing blade angle

C.  Unfeathering propellers

A.  Increasing blade angle

Question 61. What operational force tends to bend the propeller blades forward at the tip?

 

A.  Centrifugal-twisting force

B.  Torque-bending force

C.  Thrust- bending force

C.  Thrust- bending force

Question 62. When running-up an engine and testing a newly installed hydromatic propeller, it is necessary to exercise the propeller by moving the governor control through its entire travel several times to

 

A.  Seat the blades fully against the low pitch stop.

B.  Test the maximum RPM setting of the governor.

C.  Free the dome of any entrapped air.

C.  Free the dome of any entrapped air.

Question 63. Which of the following defects is cause for rejection of wood propellers?

 

A.  An oversize hub or bolthole, or elongated boltholes.

B.  Solder missing from screw heads securing metal tipping.

C.  No protective coating on the propeller.

A.  An oversize hub or bolthole, or elongated boltholes.

Question 64. Blade angle is an angle formed by a line perpendicular to the crankshaft and a line formed by the

 

A.  Relative wind

B.  Chord of the blade

C.  Blade face

B.  Chord of the blade

Question 65. The purpose of a three-way propeller valve is to

 

A.  Direct oil from the engine oil system to the propeller cylinder.

B.  Direct oil from the engine through the governor to the propeller.

C.  Permit constant-speed operation of the propeller.

A.  Direct oil from the engine oil system to the propeller cylinder.

uestion 66. Propeller aerodynamic (thrust) imbalance can be largely eliminated by

 

A.  Static balancing.

B.  Correct blade contouring and angle setting.

C.  Keeping the propeller blades within the same plane of rotation.

B.  Correct blade contouring and angle setting.

Question 67. The holding coil on a hydromatic propeller feathering button switch holds a solenoid relay closed that applies power to the propeller

 

A.  Feathering pump motor

B.  Dome feathering mechanism

C.  Governor

A.  Feathering pump motor

Question 68. How does the propeller overspeed governor on a turboprop engine decrease propeller RPM?

 

A.  When oil pressure is increased, the return spring and counterweights force the oil out of the servo piston.

B.  As oil pressure increases, the servo piston is pushed forward, and the feather spring is compressed.

C.  When oil pressure is decreased, the return spring and counterweights force the oil out of the servo piston.

B.  As oil pressure increases, the servo piston is pushed forward, and the feather spring is compressed.

Question 69. The primary purpose of a cuff on a propeller is to

 

A.  Strengthen the propeller.

B.  Distribute anti-icing fluid.

C.  Increase the flow of cooling air to the engine nacelle.

C.  Increase the flow of cooling air to the engine nacelle.

Question 70. If a flanged propeller shaft has dowel pins

 

A.  The propeller can only be installed in a given position.

B.  Install the propeller so that the blades are positioned for hand propping.

C.  Check carefully for the front cone bottoming against the pins.

A.  The propeller can only be installed in a given position.

Question 71. A constant-speed propeller provides maximum efficiency by

 

A.  Increasing the lift coefficient of the blade.

B.  Increasing blade pitch as the aircraft speed decreases.

C.  Adjusting blade angle for most conditions encountered in flight.

C.  Adjusting blade angle for most conditions encountered in flight.

Question 72. Which of the following is used to correct horizontal unbalance of a wood propeller?

 

A.  Brass screws

B.  Shellac

C.  Solder

C.  Solder

Question 73. What will happen to the propeller blade angle and the engine RPM if the tension on the propeller governor control spring (speeder spring) is increased?

 

A.  Blade angle will decrease and RPM will increase.

B.  Blade angle will decrease and RPM will decrease.

C.  Blade angle will increase and RPM will decrease.

B.  Blade angle will decrease and RPM will decrease.

Question 74. What is the basic purpose of the three small holes (No. 60 drill) in the tipping of wood propeller blades?

 

A.  To provide a means for inserting balancing shot when necessary.

B.  To provide a means for periodically impregnating the blade with preservation materials.

C.  To allow the moisture which may collect between the tipping and the wood to escape (vent the tipping)

C.  To allow the moisture which may collect between the tipping and the wood to escape (vent the tipping)

Question 75. Maximum taper contact between crankshaft and propeller hub is determined by using

 

A.  A micrometer.

B.  A surface gauge.

C.  Bearing blue color transfer.

C.  Bearing blue color transfer.

Question 76. What unit in the propeller anti-icing system controls the output of the pump?

 

A.  Rheostat

B.  Cycling timer

C.  Pressure relief valve

A.  Rheostat

Question 77. What operational force causes the greatest stress on a propeller?

 

A.  Aerodynamic twisting force

B.  Centrifugal force

C.  Thrust bending force

B.  Centrifugal force

Question 78. Which of the following best describes the blade movement of a propeller that is in the high RPM position when reversing action is begun?

 

A.  Low pitch through feather position to reverse pitch.

B.  Low pitch through high pitch to reverse pitch

C.  Low pitch directly to reverse pitch.

C.  Low pitch directly to reverse pitch.

Question 79. Why is a constant-speed counterweight propeller normally placed in full HIGH PITCH Position before the engine is stopped?

 

A.  To prevent hydraulic lock of the piston when the oil cools.

B.  To prevent overheating of the engine during the next start.

C.  To prevent exposure and corrosion of the pitch changing mechanism.

C.  To prevent exposure and corrosion of the pitch changing mechanism.

Question 80. 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

B.  Harmonic

C.  Horizontal

A.  Vertical

Question 81. The aerodynamic force acting on a rotating propeller blade operating at a normal pitch angle tends to

 

A.  Increase the pitch angle.

B.  Reduce the pitch angle.

C.  Bend the blades rearward in the line of flight.

A.  Increase the pitch angle.

Question 82. Which of the following statements concerning the installation of a new fixed-pitch wood propeller is true?

 

A.  Inspect the bolts for proper torque after every 50 hours and annual inspection

B.  Inspect the bolts for proper torque after the first flight and after the first 25 hours of flying.

C.  NAS close-tolerance balts should be used to install the propeller.

B.  Inspect the bolts for proper torque after the first flight and after the first 25 hours of flying.

Question 83. On most reciprocating multi-engine aircraft, automatic propeller synchronization is accomplished through the actuation of the

 

A.  Throttle levers

B.  Propeller governors

C.  Propeller control levers

B.  Propeller governors

Question 84. What is indicated when the front cone bottoms while installing a propeller?

 

A.  Rear cone should be moved forward.

B.  Blade angles are incorrect.

C.  Propeller-dome combination is incorrect.

A.  Rear cone should be moved forward.

Question 85. Which of the following defects is cause for rejection of wood propellers?

 

A.  Delamination found by conducting a tap test.

B.  Bonding or separation of the trailing edge of the propeller blade.

C.  Dye penetrant inspection failure.

B.  Bonding or separation of the trailing edge of the propeller blade.

Question 86. How is a propeller controlled in a large aircraft with a turboprop installation?

 

A.  By varying the engine RPM except for feathering and reversing

B.  Independently of the engine.

C.  By the engine power lever.

C.  By the engine power lever.

Question 87. What method would be used to inspect an aluminum propeller blade when a crack is suspected?

 

A.  Magnetic particle

B.  Dye-penetrant

C.  Bright light

B.  Dye-penetrant

Question 88. The primary reason for careful inspection and prompt repairing of minor surface defects such as scratches, nicks, gouges, etc. on aluminum alloy propellers is to Prevent

 

A.  Corrosion

B.  Fatigue failure

C.  Unbalanced aerodynamics

B.  Fatigue failure

Question 89. How is the speed of a constant-speed propeller changed in flight?

 

A.  By advancing or retarding the throttle.

B.  By varying the output of the governor booster pump.

C.  By changing the load tension against the flyweights in the governor.

C.  By changing the load tension against the flyweights in the governor.

Question 90. Ice formation on a propeller blade will

 

A.  Increase thrust and drag.

B.  Cause a change in blade angle.

C.  Produce unbalance and vibration.

C.  Produce unbalance and vibration.

Question 91. What is the purpose of an arbor used in balancing a propeller?

 

A.  To level the balance stand.

B.  To mark the propeller blades where weights are to be attached

C.  To support the propeller on the balance knives.

C.  To support the propeller on the balance knives.

Question 92. Which of the following best describes the blade movement of a full feathering, constant-speed propeller that is in the LOW RPM position when the feathering action is begun?

 

A.  High pitch directly to feather position.

B.  Low pitch through high pitch to feather position.

C.  High pitch through low pitch to feather position.

A.  High pitch directly to feather position.

Question 93. The propeller blade angle is defined as the acute angle between the airfoil section chord line (at the blade reference station) and which of the following?

 

A.  The plane of rotation.

B.  The relative wind.

C.  The axis of blade rotation during pitch change.

A.  The plane of rotation.

Question 94. Which of the following statements about constant-speed counterweight propellers is also true when referring to two-position counterweight propellers?

 

A.  The pilot selects the RPM and the propeller changes pitch to maintain the selected RPM.

B.  Blade angle changes are accomplished by the use of two forces, one hydraulic and the other centrifugal.

C.  Since an infinite number of blade angle positions are possible during flight, propeller efficiency is greatly improved.

B.  Blade angle changes are accomplished by the use of two forces, one hydraulic and the other centrifugal.

Question 95. During engine operation at speeds lower than those for which the constant-speed Propeller control can govern in the INCREASE RPM position, the propeller will

 

A.  Maintain engine RPM in the normal manner until the HIGH PITCH stop is reached.

B.  Remain in the full LOW PITCH position.

C.  Remain in the full HIGH PITCH position.

B.  Remain in the full LOW PITCH position.

Question 96. Oil leakage around the rear cone of a hydromatic propeller usually indicates a defective

 

A.  Dome-barrel oil seal

B.  Piston gasket

C.  Spider-shaft oil seal

C.  Spider-shaft oil seal

Question 97. Where are the high and low pitch stops of a Hamilton Standard constant-speed or two-position counterweight propeller located?

 

A.  In the hub and blade assembly.

B.  In the counterweight assembly.

C.  In the dome assembly.

B.  In the counterweight assembly.

Question 98. What normally prevents a Hartzell Compact propeller from going to feather when the engine is shut down on the ground?

 

A.  Propeller cylinder air pressure.

B.  Accumulator provided oil pressure.

C.  A latch mechanism composed of springs and lock pins.

C.  A latch mechanism composed of springs and lock pins.

Question 99. Apparent engine roughness is often a result of propeller unbalance. The effect of an unbalanced propeller will usually be

 

A.  Approximately the same at all speeds.

B.  Greater at high RPM.

C.  Greater at low RPM

B.  Greater at high RPM.

Question 100. The thrust produced by a rotating propeller is a result of

 

A.  An area of low pressure behind the propeller blades.

B.  The angle of relative wind and rotational velocity of the propeller.

C.  An area of decreased pressure immediately in front of the propeller blades.

C.  An area of decreased pressure immediately in front of the propeller blades.