Propeller

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1 (8881) - How is aircraft electrical power for propeller deicer systems transferred from the engine to the propeller hub assembly?

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116 Terms

1

1 (8881) - How is aircraft electrical power for propeller deicer systems transferred from the engine to the propeller hub assembly?

B- By slip rings and brushes.

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2

2 (8882) - How is anti-icing fluid ejected from the slinger ring on a propeller?

Centrifugal force.

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3

3 (8883) - On most reciprocating multiengine aircraft, automatic propeller synchronization is accomplished through the actuation of the

B- propeller governors.

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4

4 (8884) - Propeller fluid anti-icing systems generally use which of the following?

B- Isopropyl alcohol.

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5

5 (8885) - What is a function of the automatic propeller synchronizing system on multiengine aircraft?

B- To control engine RPM and reduce vibration.

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6

6 (8886) - Ice formation on propellers, when an aircraft is in flight, will

A- decrease thrust and cause excessive vibration.

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7

7 (8887) - What unit in the propeller anti-icing system controls the output of the pump?

B- Rheostat.

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8

8 (8888) - Proper operation of electric deicing boots on individual propeller blades may best be determined by

A- feeling the sequence of boot heating and have an assistant observe the loadmeter indications.

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9

9 (8889) - A propeller synchrophasing system allows a pilot to reduce noise and vibration by

A- adjusting the phase angle between the propellers on an aircraft's engines.

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10

10 (8890) - Which of the following determines oil and grease specifications for lubrication of propellers?

C- Propeller manufacturers.

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11

11 (8891) - 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.

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12

12 (8892) - 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.

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13

13 (8893) - What is the purpose of an arbor used in balancing a propeller?

A- To support the propeller on the balance knives.

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14

14 (8894) - If a blade of a particular metal propeller is shortened because of damage to the tip, the remaining blade(s) must be

C- reduced to conform with the shortened blade.

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15

15 (8895) - The application of more protective coating on one blade than the other when refinishing a wood propeller

C- may be necessary to achieve final balancing.

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16

16 (8896) - Apparent engine roughness is often a result of propeller unbalance. The effect of an unbalanced propeller will usually be

C- greater at high RPM.

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17

17 (8897) - Which of the following is used to correct horizontal unbalance of a wood propeller?

C- Solder.

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18

18 (8898) - Propeller aerodynamic (thrust) imbalance can be largely eliminated by

A- correct blade contouring and angle setting.

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19

19 (8899) - 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- increase, engine manifold pressure will increase, and engine RPM will decrease.

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20

20 (8900) - Why is the pulley stop screw on a propeller governor adjustable?

A- To limit the maximum engine speed during takeoff.

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21

21 (8901) - 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

C- remain in the full LOW PITCH position.

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22

22 (8902) - When engine power is increased, the constant-speed propeller tries to function so that it will

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

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23

23 (8903) - The propeller governor controls the

A- oil to and from the pitch changing mechanism.

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24

24 (8904) - During the on-speed condition of a propeller, the

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

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25

25 (8905) - What actuates the pilot valve in the governor of a constant-speed propeller?

B- Governor flyweights.

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26

26 (8906) - 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.

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27

27 (8907) - 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?

C- Blade angle will decrease and RPM will increase.

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28

28 (8908) - How is the speed of a constant-speed propeller changed in flight?

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

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29

29 (8909) - When the centrifugal force acting on the propeller governor flyweights overcomes the tension on the speeder spring, a propeller is in what speed condition?

C- Overspeed.

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30

30 (8910) - What operational force causes the greatest stress on a propeller?

Centrifugal force.

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31

31 (8911) - What operational force tends to increase propeller blade angle?

B- Aerodynamic twisting force.

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32

32 (8912) - How is a propeller controlled in a large aircraft with a turboprop installation?

C- By the engine power lever.

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33

33 (8913) - How does the aerodynamic twisting force affect operating propeller blades?

A- It tends to turn the blades to a high blade angle.

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34

34 (8914) - 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 directly to reverse pitch.

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35

35 (8915) - Propellers exposed to salt spray should be flushed with

B- fresh water.

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36

36 (8916) - How can a steel propeller hub be tested for cracks?

B- By magnetic particle inspection.

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37

37 (8917) - Which of the following functions requires the use of a propeller blade station?

A- Measuring blade angle.

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38

38 (8918) - 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.

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39

39 (8919) - During which of the following conditions of flight will the blade pitch angle of a constant-speed propeller be the greatest?

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

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40

40 (8920) - The actual distance a propeller moves forward through the air during one revolution is known as the

A- effective pitch.

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41

41 (8921) - The pitch-changing mechanism of the hydromatic propeller is lubricated by

A- the pitch-changing oil.

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42

42 (8922) - 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.

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43

43 (8923) - Propeller blade stations are measured from the

B- hub centerline.

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44

44 (8924) - The thrust produced by a rotating propeller is a result of

B- an area of decreased pressure immediately in front of the propeller blades.

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45

45 (8925) - Why is a constant-speed counterweight propeller normally placed in full HIGH PITCH position before the engine is stopped?

A- To prevent exposure and corrosion of the pitch changing mechanism.

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46

46 (8926) - The low pitch stop on a constant-speed propeller is usually set so that

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

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47

47 (8927) - The angle-of-attack of a rotating propeller blade is measured between the blade chord or face and which of the following?

C- Relative airstream.

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48

48 (8928) - The centrifugal twisting moment of an operating propeller tends to

B- reduce the pitch angle.

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49

49 (8929) - Which of the following is identified as the cambered or curved side of a propeller blade, corresponding to the upper surface of a wing airfoil section?

A- Blade back.

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50

50 (8930) - 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?

B- High pitch directly to feather position.

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51

51 (8931) - The holding coil on a hydromatic propeller feathering button switch holds a solenoid relay closed that applies power to the propeller

C- feathering pump motor.

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52

52 (8932) - What is the primary purpose of the metal tipping which covers the blade tips and extends along the leading edge of each wood propeller blade?

B- To prevent impact damage to the tip and leading edge of the blade.

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53

53 (8933) - Blade angle is an angle formed by a line perpendicular to the crankshaft and a line formed by the

B- chord of the blade.

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54

54 (8934) - Propeller blade station numbers increase from

A- hub to tip.

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55

55 (8935) - The aerodynamic force acting on a rotating propeller blade operating at a normal pitch angle tends to

B- increase the pitch angle.

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56

56 (8936) - 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?

B- Centrifugal force acting on the counterweights.

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57

57 (8937) - The purpose of permanently sealing and partially filling some models of McCauley propeller hubs with dyed oil is to

C- make the location of cracks readily apparent.

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58

58 (8938) - 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?

C- Low pitch through high pitch to feather position.

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59

59 (8939) - The blade angle of a fixed-pitch propeller

B- is smallest at the tip.

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60

60 (8940) - During operational check of an aircraft using hydromatic full-feathering propellers, the following observations are made:The feather button, after being pushed, remains depressed until the feather cycle is complete, then opens.When unfeathering, it is necessary to manually hold the button down until unfeathering is accomplished.

A- Both feather cycle and unfeather cycle are functioning properly.

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61

61 (8941) - Inspection of propeller blades by dye-penetrant inspection is accomplished to detect

A- cracks or other defects.

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62

62 (8942) - What controls the constant-speed range of a constant-speed propeller?

C- The mechanical limits in the propeller pitch range.

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63

63 (8943) - For takeoff, a constant-speed propeller is normally set in the

C- LOW PITCH, high RPM position.

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64

64 (8944) - Where are the high and low pitch stops of a Hamilton Standard constant-speed or two-position counterweight propeller located?

B- In the counterweight assembly.

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65

65 (8945) - 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.

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66

66 (8946) - 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.

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67

67 (8947) - Which of the following defects is cause for rejection of wood propellers?

B- An oversize hub or bolthole, or elongated boltholes.

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68

68 (8948) - An aircraft's propeller system beta range

A- is used to produce zero or negative thrust.

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69

69 (8949) - The primary purpose of a cuff on a propeller is to

C- increase the flow of cooling air to the engine nacelle.

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70

70 (8950) - The purpose of a three-way propeller valve is to

A- direct oil from the engine oil system to the propeller cylinder.

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71

71 (8951) - The primary purpose of a propeller is to

B- change engine horsepower to thrust.

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72

72 (8952) - A constant-speed propeller provides maximum efficiency by

B- adjusting blade angle for most conditions encountered in flight.

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73

73 (8953) - The centrifugal twisting force acting on a propeller blade is

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

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74

74 (8954) - Geometric pitch of a propeller is defined as the

B- effective pitch plus slippage.

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75

75 (8955) - Propeller blade angle is the angle between the

C- chord of the blade and the rotational plane of the propeller.

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76

76 (8956) - What operational force causes propeller blade tips to lag in the opposite direction of rotation?

C- Torque-bending force.

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77

77 (8957) - What operational force tends to bend the propeller blades forward at the tip?

C- Thrust-bending force.

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78

78 (8958) - What are the rotational speed and blade pitch angle requirements of a constant-speed propeller during takeoff?

B- High-speed and low-pitch angle.

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79

79 (8959) - (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,

C- neither No. 1 nor No. 2 is true.

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80

80 (8960) - (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.

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81

81 (8961) - 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

B- feathered or in the most critical pitch configuration.

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82

82 (8962) - Constant-speed non-feathering McCauley, Hartzell, and other propellers of similar design without counterweights increase pitch angle using

A- oil pressure.

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83

83 (8963) - Counterweights on constant-speed propellers are generally used to aid in

A- increasing blade angle.

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84

84 (8964) - When lubricating a Hartzell propeller blade with grease, to prevent damage to the blade seals, the service manual may recommend on some models to

C- remove one of the two zerk fittings for the blade and grease the blade through the remaining fitting.

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85

85 (8965) - The primary purpose of a feathering propeller is to

C- eliminate the drag created by a windmilling propeller when an engine fails in flight.

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86

86 (8966) - What normally prevents a Hartzell Compact propeller from going to feather when the engine is shut down on the ground?

B- A latch mechanism composed of springs and lock pins.

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87

87 (8967) - When running-up an engine ae 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.

B- free the dome of any entrapped air.

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88

88 (8968) - Which of the following occurs to cause front cone bottoming during propeller installation?

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.

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89

89 (8969) - What is indicated when the front cone bottoms while installing a propeller?

C- Rear cone should be moved forward.

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90

90 (8970) - How is the oil pressure delivery on a hyling out the feathering push button.

B- Electric cutout pressure switch.

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91

91 (8971) - 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.

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92

92 (8972) - Which of the following statements concerning the installation of a new fixed-pitch wood propeller is true?

C- Inspect the bolts for tightness after the first flight and again after the first 25 hours of flying.

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93

93 (8973) - If propeller cones or hub cone seats show evidence of galling and wear, the most likely cause is

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

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94

94 (8974) - 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.

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95

95 (8975) - Oil leakage around the rear cone of a hydromatic propeller usually indicates a defective

B- spider-shaft oil seal.

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96

96 (8976) - Maximum taper contact between crankshaft and propeller hub is determined by using

A- bearing blue color transfer.

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97

97 (8977) - Propeller blade tracking is the process of determining

C- the positions of the tips of the propeller blades relative to each other.

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98

98 (8978) - What is the basic purpose of the three small holes (No. 60 drill) in the tipping of wood propeller blades?

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

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99

99 (8979) - 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

C- placing shims between the inner flange and the propeller.

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100

100 (8980) - Manually feathering a hydromechanical propeller means to

C- port governor oil pressure from the cylinder of the propeller.

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