問題一覧
1
What actuates the pilot valve in the governor of a constant-speed propeller?
Governor flyweights.
2
The purpose of permanently sealing and partially filling some models of McCauley propeller hubs with dyed oil is to
make the location of cracks readily apparent.
3
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
remain in the full LOW PITCH position.
4
The primary purpose of the front and rear cones for propellers that are installed on splined shafts is to
position the propeller hub on the splined shaft.
5
What operational force tends to increase propeller blade angle?
Aerodynamic twisting force.
6
Minor surface damage located in a repairable area, but not on the leading or trailing edges of aluminum blades, may be repaired by first
filing with a riffle file.
7
When engine power is increased, the constant-speed propeller tries to function so that it will
maintain the RPM, increase the blade angle, and maintain a low angle of attack.
8
Which of the following statements concerning the installation of a new fixed-pitch wood propeller is true?
Inspect the bolts for tightness after the first flight and again after the first 25 hours of flying.
9
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?
High pitch directly to feather position.
10
Which of the following is used to correct horizontal unbalance of a wood propeller?
Solder
11
The primary purpose of a propeller is to
change engine horsepower to thrust.
12
What unit in the propeller anti-icing system controls the output of the pump?
Rheostat
13
Propeller aerodynamic (thrust) imbalance can be largely eliminated by
correct blade contouring and angle setting.
14
Which of the following functions requires the use of a propeller blade station?
Measuring blade angle.
15
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?
Centrifugal force acting on the counterweights.
16
The blade angle of a fixed-pitch propeller
is smallest at the tip.
17
After proper removal of aluminum blade damage, the affected surface should be polished with
very fine sandpaper
18
What operational force causes the greatest stress on a propeller?
Centrifugal force
19
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?
The plane of rotation
20
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
feathered or in the most critical pitch configuration.
21
What is a function of the automatic propeller synchronizing system on multiengine aircraft?
To control engine RPM and reduce vibration.
22
What operational force tends to bend the propeller blades forward at the tip?
Thrust-bending force.
23
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?
Vertical
24
Propellers exposed to salt spray should be flushed with
Fresh water
25
Which of the following methods is used to straighten a bent aluminum propeller blade that is within repairable limits?
Cold straightening only.
26
The centrifugal twisting moment of an operating propeller tends to
reduce the pitch angle.
27
The angle-of-attack of a rotating propeller blade is measured between the blade chord or face and which of the following?
Relative airstream
28
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
increase, engine manifold pressure will increase, and engine RPM will decrease.
29
Removal of propeller blade tips within Type Certificate Data Sheet limits when correcting a defect is
A major repair
30
Propeller blade tracking is the process of determining
the positions of the tips of the propeller blades relative to each other.
31
If a flanged propeller shaft has dowel pins
the propeller can be installed in only one position.
32
The primary purpose of a feathering propeller is to
eliminate the drag created by a wind milling propeller when an engine fails in flight.
33
Why is the pulley stop screw on a propeller governor adjustable?
To limit the maximum engine speed during takeoff.
34
Propeller blade stations are measured from the
hub centerline
35
How is the speed of a constant-speed propeller changed in flight?
By changing the load tension against the flyweights ¡n the governor.
36
Cold straightening a bent aluminum propeller blade may be accomplished by
an appropriately rated repair station or the manufacturer.
37
Surface treatment to counter the effects of dye-penetrant inspection on a propeller is accomplished by
washing off with solvent.
38
Grease used in aircraft propellers reduces the frictional resistance of moving parts and is easily molded into any form under pressure. This statement defines
antifriction and plasticity characteristics of grease.
39
An aircraft’s propeller system beta range
is used to produce zero or negative thrust.
40
What operational force causes propeller blade tips to lag in the opposite direction of rotation?
Torque-bending force
41
On most reciprocating multiengine aircraft, automatic propeller synchronization is accomplished through the actuation of the
propeller governors
42
Which of the following generally renders an aluminum alloy propeller unrepairable?
Transverse cracks of any size.
43
What action takes place when the cockpit control lever for a hydroniatic constant-speed propeller is actuated?
Compression of the speeder spring is changed.
44
It is important that nicks in aluminum alloy propeller blades be repaired as soon as possible in order to
eliminate stress concentration points.
45
The pitch-changing mechanism of the hydroniatic propeller is lubricated by
the pitch-changing oil.
46
Where are the high and low pitch stops of a Hamilton Standard constant-speed or two-position counterweight propeller located?
In the counterweight assembly
47
If a blade of a particular metal propeller is shortened because of damage to the tip, the remaining blade(s) must be
reduced to conform with the shortened blade.
48
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
fatigue failure.
49
How can a steel propeller hub be tested for cracks?
By magnetic particle inspection.
50
How does the propeller overspeed governor on a turboprop engine decrease propeller RPM?
By allowing oil to escape from the propeller hub thus driving the blades to a increased blade angle.
51
For takeoff, a constant-speed propeller is normally set in the
LOW PITCH, high RPM position.
52
On aircraft equipped with hydraulically operated constant- speed propellers, all ignition and magneto checking is done with the propeller in which position?
High RPM
53
Constant-speed non-feathering McCauley, Hartzell, and other propellers of similar design without counterweights increase pitch angle using
oil pressure
54
The purpose of a three-way propeller valve is to
direct oil from the engine oil system to the propeller cylinder.
55
A propeller synchrophasing system allows a pilot to reduce noise and vibration by
adjusting the phase angle between the propellers on an aircraft’s engines.
56
Proper operation of electric deicing boots on individual propeller blades may best be determined by
feeling the sequence of boot heating and have an assistant observe the loadmeter indications.
57
What is the purpose of an arbor used in balancing a propeller?
To support the propeller on the balance knives.
58
Generally, unless otherwise specified by the manufacturer, repairs of nicks, scratches, gouges, etc. on aluminum propeller blades must be made
parallel to the length of the blade.
59
Blade angle is an angle formed by a line perpendicular to the crankshaft and a line formed by the
chord of the blade
60
How is anti-icing fluid ejected from the slinger ring on a propeller?
By centrifugal force.