Questions and Answers - Propellers (Part 2) | Aircraft Systems

Questions and Answers - Propellers (Part 2)

61. Inspection of propeller blades by dye-penetrant inspection is accomplished to detect
a. cracks or other defects.
b. corrosion at the blade tip.
c. torsional stress.

62. What controls the constant-speed range of a constant-speed propeller?
a. Engine RPM.
b. Angle of climb and descent with accompanying changes in airspeed.
c. The mechanical limits in the propeller pitch range.

63. For takeoff, a constant-speed propeller is normally set in the
a. HIGH PITCH, high RPM position.
b. HIGH PITCH, low RPM position.
c. LOW PITCH, high RPM position.

64. 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.

65. Which of the following statements about constant-speed counterweight propellers is also true when referring to two-position counterweight propellers?
a. Blade angle changes are accomplished by the use of two forces, one hydraulic and the other centrifugal.
b. Since an infinite number of blade angle positions are possible during flight, propeller efficiency is greatly improved.
c. The pilot selects the RPM and the propeller changes pitch to maintain the selected RPM.


66. Most engine-propeller combinations have one or more critical ranges within which continuous operation is not permitted. Critical ranges are established to avoid
a. severe propeller vibration.
b. low or negative thrust conditions.
c. inefficient propeller pitch angles.

67. Which of the following defects is cause for rejection of wood propellers?
a. Solder missing from screw heads securing metal tipping.
b. An oversize hub or bolt hole, or elongated bolt holes.
c. No protective coating on propeller.

68. 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.

69. The primary purpose of a cuff on a propeller is to
a. distribute anti-icing fluid.
b. strengthen the propeller.
c. increase the flow of cooling air to the engine nacelle.

70. 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.

71. The primary purpose of a propeller is to
a. create lift on the fixed airfoils of an aircraft.
b. change engine horsepower to thrust.
c. provide static and dynamic stability of an aircraft in flight.

72. A constant-speed propeller provides maximum efficiency by
a. increasing blade pitch as the aircraft speed decreases.
b. adjusting blade angle for most conditions encountered in flight.
c. increasing the lift coefficient of the blade.

73. 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. less than the aerodynamic twisting force and tends to move the blade to a lower angle.
c. greater than the aerodynamic twisting force and tends to move the blade to a lower angle.

74. Geometric pitch of a propeller is defined as the
a. effective pitch minus slippage.
b. effective pitch plus slippage.
c. angle between the blade chord and the plane of rotation.

75. Propeller blade angle is the angle between the
a. chord of the blade and the relative wind.
b. relative wind and the rotational plane of the propeller.
c. chord of the blade and the rotational plane of the propeller.


76. What operational force causes propeller blade tips to lag in the opposite direction of rotation?
a. Thrust-bending force.
b. Aerodynamic-twisting force.
c. Torque-bending force.

77. What operational force tends to bend the propeller blades forward at the tip?
a. Torque-bending force.
b. Centrifugal-twisting force.
c. Thrust-bending force.

78. What are the rotational speed and blade pitch angle requirements of a constant-speed propeller during takeoff?
a. Low-speed and high-pitch angle.
b. High-speed and low-pitch angle.
c. High-speed and high-pitch angle.

79. (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. only No. 1 is true.
b. both No. 1 and No.2 are true.
c. neither No. 1 nor No.2 is true.

80. (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. only No.2 is true.
c. both No. 1 and No.2 are true.

81. Longitudinal (fore and aft) clearance of constant-speed propeller blades or cuffs must be at least 112 inch (12.7 mm) between propeller parts and stationary parts of the aircraft. This clearance is with the propeller blades
a. at takeoff pitch (maximum thrust) angle.
b. feathered or in the most critical pitch configuration.
c. at the lowest pitch angle.

82. Constant-speed non-feathering McCauley, Hartzell, and other propellers of similar design without counterweights increase pitch angle using
a. oil pressure.
b. spring pressure.
c. centrifugal twisting moment.

83. Counterweights on constant-speed propellers are generally used to aid in
a. increasing blade angle.
b. decreasing blade angle.
c. unfeathering the propellers.

84. 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 the seals prior to greasing and reinstall them afterwards.
c. remove one of the two zerk fittings for the blade and grease the blade through the remaining fitting.

85. The primary purpose of a feathering propeller is to
a. prevent further engine damage when an engine fails in flight.
b. prevent propeller damage when an engine fails in flight.
c. eliminate the drag created by a windmilling propeller when an engine fails in flight.

86. 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. A latch mechanism composed of springs and lock pins.
c. Accumulator provided oil pressure.

87. 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. free the dome of any entrapped air.
c. test the maximum RPM setting of the governor.


88. Which of the following occurs to cause front cone bottoming during propeller installation?
a. The front cone becomes bottomed in the front propeller hub cone seat before the rear propeller hub cone seat has engaged the rear cone.
b. 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.
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.

89. What is indicated when the front cone bottoms while installing a propeller?
a. Propeller-dome combination is incorrect.
b. Blade angles are incorrect.
c. Rear cone should be moved forward.

90. How is the oil pressure delivery on a hydromatic propeller normally stopped after the blades have reached their full-feathered position?
a. Pulling out the feathering push button.
b. Electric cutout pressure switch.
c. Stop lugs in the teeth of the rotating cam.

91. The primary purpose of the front and rear cones for propellers that are installed on splined shafts is to
a. position the propeller hub on the splined shaft.
b. prevent metal-to-metal contact between the propeller and the splined shaft.
c. reduce stresses between the splines of the propeller and the splines of the shaft.

92. Which of the following statements concerning the installation of a new fixed-pitch wood propeller is true?
a. If a separate metal hub is used, final track should be accomplished prior to installing the hub in the propeller.
b. NAS close-tolerance bolts should be used to install the propeller.
c. Inspect the bolts for tightness after the first flight and again after the first 25 hours of flying.

93. If propeller cones or hub cone seats show evidence of galling and wear, the most likely cause is
a. 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 previous operation.
c. the front cone was not fully bottomed against the crankshaft splines during installation.

94. On aircraft equipped with hydraulically operated constant-speed propellers, all ignition and magneto checking is done with the propeller in which position?
a. High RPM.
b. LOW RPM.
c. High pitch range.

95. Oil leakage around the rear cone of a hydromatic propeller usually indicates a defective
a. piston gasket.
b. spider-shaft oil seal.
c. dome-barrel oil seal.

96. Maximum taper contact between crankshaft and propeller hub is determined by using
a. bearing blue color transfer.
b. a micrometer.
c. a surface gauge.

97. Propeller blade tracking is the process of determining
a. the plane of rotation of the propeller with respect to the aircraft longitudinal axis.
b. that the blade angles are within the specified tolerance of each other.
c. the positions of the tips of the propeller blades relative to each other.

98. 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).

99. 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. slightly overtightening the attachment bolts adjacent to the most forward blade.
b. discarding the propeller since out-of-track conditions cannot be corrected.
c. placing shims between the inner flange and the propeller.

100. Manually feathering a hydromechanical propeller means to
a. block governor oil pressure to the cylinder of the propeller.
b. port governor oil pressure to the cylinder of the propeller.
c. port governor oil pressure from the cylinder of the propeller.

101. In what position is the constant-speed propeller control placed to check the magnetos?
a. Full decrease, low propeller blade pitch angle.
b. Full increase, high propeller blade pitch angle.
c. Full increase, low propeller blade pitch angle.

102. If a flanged propeller shaft has dowel pins
a. install the propeller so that the blades are positioned for hand propping.
b. the propeller can be installed in only one position.
c. check carefully for front cone bottoming against the pins.

103. 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.

104. Which of the following methods is used to straighten 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.

105. It is important that nicks in aluminum alloy propeller blades be repaired as soon as possible in order to
a. maintain equal aerodynamic characteristics between the blades.
b. eliminate stress concentration points.
c. equalize the centrifugal loads between the blades.

106. 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. perpendicular to the blade axis.
c. so as to return the damaged area to the original dimensions.

107. Minor surface damage located in a repairable area, but not on the leading or trailing edges of aluminum blades, may be repaired by first
a. filing with a riffle file.
b. filing with a half round or flat file.
c. rough sanding and applying a proper filler.

108. After proper removal of aluminum blade damage, the affected surface should be polished with
a. fine steel wool.
b. very fine sandpaper.
c. powdered soapstone.

109. When preparing a propeller blade for inspection it should be cleaned with
a. mild soap and water.
b. steel wool.
c. methyl ethyl ketone.

110. What method would be used to inspect an aluminum propeller blade when a crack is suspected
a. use a bright light.
b. magnetic particle.
c. dye-penetrant.

111. Removal of propeller blade tips within Type Certificate Data Sheet limits when correcting a defect is
a. a major alteration.
b. a major repair.
c. permitted under the privileges and limitations of a powerplant rating.

112. Surface treatment to counter the effects of dye-penetrant inspection on a propeller is accomplished by
a. washing off with solvent.
b. wiping with alcohol.
c. rinse the blade in alodine solution.

113. One of the advantages of inspecting an aluminum propeller utilizing dye-penetrant inspection procedure is that
a. defects just below the surface are indicated.
b. it shows whether visible lines and other marks are actually cracks rather than scratches.
c. it indicates overspeed condition.

114. 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. unbalanced aerodynamics.
c. fatigue failure.

115. Which of the following generally renders an aluminum alloy propeller unrepairable?
a. Any repairs that would require shortening and recontouring of blades.
b. Any slag inclusions or cold shuts.
c. Transverse cracks of any size.

116. Cold straightening a bent aluminum propeller blade may be accomplished by
a. the holder of a mechanic certificate with a powerplant rating.
b. an appropriately rated repair station or the manufacturer.
c. a person working under the supervision of the holder of a mechanic certificate with both airframe and powerplant ratings.


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