1
Q
What is the specific gravity of a lead acid battery?
A
1.275 – 1.3
2
Q
Clevis bolts are used only where?
A
Where shear loads occur
3
Q
What does two dashes on the head of a bolt or rivet mean?
A
That it is made of aluminum alloy 2024
4
Q
Eyebolts are used where?
A
Where external tension loads are to be applied
5
Q
Aircraft control cables are made from?
A
Carbon steel or corrosion resistant steel wire and may consist of flexible or non-flexible construction (Galvanized or stainless)
6
Q
What type of corrosion occurs when two mating surfaces normally at rest with respect to each other are subject to slight relative motion?
A
Fretting corrosion
7
Q
Who is the ‘SAE’?
A
Society of Automotive Engineers
8
Q
The property of metal, which permits it to be permanently drawn, bent or twisted into various shapes without breaking is?
A
Ductility
9
Q
What do you call the tool to make external threads?
A
Die
10
Q
What is the electrolyte used in nickel cadmium battery?
A
Potassium hydroxide solution
11
Q
On control cable, woven splice terminal, the 5 tuck woven splice may be utilized on 7x7 flexible cable and 7x19 extra flexible cable; however, this type of terminal will only develop what percentage of cable strength?
A
75%
12
Q
On control cable, a wrap solder splice will develop?
A
90% of cable strength
13
Q
A swaged type terminal splice will develop?
A
100% of cable strength
14
Q
A swaged type splice is tested to?
A
60% of its breaking strength
15
Q
In general, how would you choose the diameter of a rivet?
A
Three times the thickness of the thickest layer
16
Q
Number 9 in binary is?
A
1001
17
Q
What happens to a flexible hydraulic line under pressure?
A
It contracts in length and expands in diameter
18
Q
What should be the total length of a flex line?
A
The distance between the 2 fittings plus 5 to 8%
19
Q
Minimum distance between supports on a flex hose is?
A
24 inches
20
Q
Threads on bolts, screws and nuts are designated by class of fit. What is Class 1?
A
Loose fit
21
Q
Aircraft bolts are usually manufactured in?
A
Class 3
22
Q
When you bend a sheet of aluminum, the bend should be?
A
90 degrees to the grain
23
Q
Atmospheric pressure or altimeter pressure at sea level is?
A
14.7 psi or 29.92 in hg
24
Q
What is the term used to describe the temperature to which humid air must be cooled at constant pressure to become saturated?
A
Dew point
25
The formula for power is?
P = force x distance / time
26
Horsepower is?
550 ft lbs per sec or 33000 ft. lbs. per min
27
What kind of inspection requires the least amount of surface preparation?
Ultrasonic inspection
28
When do you apply the developer in the inspection process?
After cleaning surface, applying penetrant, removing penetrant with emulsifier, and drying part
29
Volume of a cylinder formula is?
V = 3.14 x r² x h
30
On engineering drawing, where is usually the title and scale located?
Lower right corner
31
What kind of line is this _____ _ _ _____ _ _ _____?
Phantom line
32
What type of drawing would permit the tracing of the flow of a hydraulic system?
Schematic drawing
33
What has the lightest specific gravity: water, mercury, kerosene, or aviation gasoline?
Aviation gasoline
34
What are the two types of threads on an 'A.N.' fitting?
Parallel and tapered
35
In fitting AN320-10, what does the -10 mean?
10/16 = 5/8
36
What are the colors of hydraulic lines?
Blue and yellow
37
What is the color of the instrument air line?
Orange and gray with a zigzag
38
The head of a bolt that has an 'X' inside of a triangle is a?
NAS close tolerance bolt
39
What is a JO bolt?
Internally threaded structural fastener
40
What is the principal advantage of the Teflon hose?
Its operating strength
41
Aircraft hose fittings have a flare angle of?
37 degrees
42
What are thermosetting plastics?
Application of heat to set up or harden
43
What is the most important factor when selecting torch tip size?
Thickness of the metal
44
What is the first consideration for selecting a welding rod?
Proper material
45
What is the welding method of silver soldering?
Brazing
46
How are rivets measured, e.g. MS20426-DD-5-8?
5 diameter in 32 of an inch, 8 length in 16 of an inch
47
What is the minimum edge distance of a rivet?
2X diameter of rivet
48
What is the minimum rivet spacing?
3X diameter of rivet
49
What must be considered when making a rivet seam?
Shear strength of rivet and bearing strength of metal
50
What compound mixed with aluminum is best for weight to strength ratio?
Zinc
51
If you have a cylinder and its volume is reduced to half and its temperature is doubled, what happens to the pressure?
Increases
52
What is the percentage of gases in the atmosphere?
21% oxygen, 78% nitrogen, 1% other
53
What amount of damage is allowable in hydraulic lines that can be repaired in a scratch?
10% of wall thickness, dent 20%, flattening 75%
54
How many threads should be showing for turnbuckle installations?
Max 3
55
Nitrating is hardening metal by?
Heating the metal up to 1000 F and then surrounding it with ammonia gas
56
Sheet metal tensile strength is measured in?
PSI
57
What is horsepower measured in?
33000 ft. lb. per min or 550 ft lb. per sec
58
What is one horsepower?
550 ft. lb. per sec
59
What is the total resistance if 3, 47-ohm resistors are wired in parallel?
Ohms = 47/3
60
What is the PNP transistor symbol?
61
If you have two channels with no input on either, but you receive output, what type of gate is it?
NOR gate or a NAND gate
62
What are the thread types for hydraulic fittings?
Pipe and tube
63
What is the lubricant that can be used with oxygen?
MIL-T-5542
64
'Cold Flow' is a term used in?
Rubber hose
65
What is the area of a cylinder?
3.1416 x diameter squared divided by 4
66
What is the minimum size of cable for primary flight controls?
1/8 inch
67
What are the two substances that consist of nicad battery plates?
Nickel hydroxide and Cadmium hydroxide
68
What is the most common type of rivet used on aircraft?
Dimpled head (2117)
69
What is the simplest test for delamination of composites?
Ring or coin tap test
70
Why is lead used with x-ray inspections?
High absorption of alpha rays
71
What is a microvolt?
V x 10^-6 e.g. 0.000 001
72
What is the primary advantage of nylon center hydraulic lines?
It can take high pressure
73
Hoses for aircraft instruments are marked with?
Orange and gray with a zigzag
74
What kind of fluids have a good resistance to combustion and a low degree of evaporation?
High flash point
75
To eliminate magnetic flux on pieces being magnetically inspected, what is applied?
D/C decreasing in intensity
76
What is the color of 100 avgas fuel?
Green
77
What are 7 x 19 cables?
7 strands of 19 wires each
78
The term 'wide cut' is used with?
Aviation fuels jet B, when kerosene is mixed with gasoline
79
What is Reid vapor pressure?
The pressure on a fuel which is required to change it to a vapor
80
What tool is designed to enlarge a hole and produce an accurate size?
Reamer
81
What is the metal composition construction percentage for Monel?
68% nickel and 29% copper
82
What method of magnetic particle inspection is most widely used?
Continuous
83
Alloy steel bolts smaller than ¼ inch in diameter should not be used where?
On primary structure
84
What equals one horsepower?
33000 ft. lbs. per min
85
What is the ratio of the water vapor actually present in the atmosphere to the amount that would be present if the air was saturated at the prevailing temperature and pressure?
Relative humidity
86
What is the meaning of a print tolerance as used in the title block of an aircraft blueprint?
A notation on an aircraft drawing of the tolerance allowed on the finished part described by the drawing
87
If a cylinder's volume is reduced to half (temperature remains constant), what will happen to the pressure?
Double
88
If both volume and temperature of a confined gas are doubled, what will happen to the pressure?
Not change
89
A nicopress splice has what percentage of strength?
100%
90
What does the speed of sound in the atmosphere do?
Changes with a change in temperature
91
A material's resistance to the forces tending to tear it at the point of pressure is?
Toughness-shear
92
Given the power in watts and the resistance, how do you find the current?
I = E/R
93
What is the cube root of 99?
4.626
94
What is a Joggle (sheet metal term)?
Offset
95
What method is used to detect intergranular corrosion?
Ultrasonic or eddy current
96
What is used to quench aluminum when it is being solution heat-treated?
Water
97
When metal is allowed to cool at air temperature, what is that called?
Normalizing
98
When a transistor starts to heat up, what happens to it and its material?
Even small amounts of heat can damage a transistor – heat sinks are often used
99
What percentage of potassium hydroxide is there in nicad electrolyte?
30% lower resistance
100
Which tool is used to find the center of a shaft or other cylindrical work?
Combination set
101
Why are metal parts put in the freezer after heat-treating?
Slows down hardening after heat treating
102
What is the frequency and the inductance in henrys used to find in a circuit?
Circuit reactance
103
When using dye penetrant, if you are trying to find a minute crack, what step will take longer?
Allow penetrant more time
104
When using a water-soluble penetrant, when is the developer used?
They will describe the step before
105
What is the international marking for instrument air?
A zigzag
106
What is a JO-bolt?
A 3 piece internally threaded rivet
107
Duckbill pliers are mainly used for?
Lockwire
108
What type of lubricant is used in welding hose oxygen lines?
MIL-T-5542 or Bee wax
109
When a repair is made to a honeycomb structure, what is the material that the new honeycomb is made of?
Fiberglass
110
What should the working voltage of a capacitor in an AC circuit be?
At least 50% greater than the highest applied voltage
111
What type of diagram is used to explain a principle of operation, rather than show the parts as they actually appear?
Schematic diagram
112
A certain slack must be left in a flexible hose during installation because, when under pressure, it?
Contracts in length and expands in diameter
113
Flexible lines must be installed with what percentage of slack?
5 to 8%
114
Scratches or nicks on the straight portion of aluminum alloy tubing may be repaired if they are no deeper than?
10% of the wall thickness
115
Which metals are inspected using the magnetic particle inspection method?
Iron alloys
116
One way a part may be demagnetized after magnetic particle inspection is by?
Slowly moving the part out of an AC magnetic field of sufficient strength
117
Which heat-treating process of metal produces a hard, wear-resistant surface over a strong, tough core?
Case hardening
118
Nitriding is a process which?
Forms a hard case on a part to resist wear
119
Where is an AN clevis bolt used in an airplane?
Only for shear load application
120
107. In a capacitive circuit does voltage lead or lag current and by how many degrees (also know when it is an inductive circuit) pg.126 in general a/c text?
Voltage lags it would in theory be 90 degree
121
108. One question on resistor colors is red, green, and yellow?
250,000 +- 20%
GENERAL PRACTICE
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