T40(E)(N9)T
NOVEMBER 2012
NATIONAL CERTIFICATE
AIRCRAFT METALWORK THEORY N2
(11021102)
9 November (X-Paper)
09:00 – 12:00
Candidates will require pens, drawing instruments, a pencil, calculator and a ruler.
This question paper consists of 5 pages and 2 diagram sheets.
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T40(E)(N9)T
DEPARTMENT OF HIGHER EDUCATION AND TRAINING
REPUBLIC OF SOUTH AFRICA
NATIONAL CERTIFICATE
AIRCRAFT METALWORK THEORY N2
TIME: 3 HOURS
MARKS: 100
________________________________________________________________________
INSTRUCTIONS AND INFORMATION
1.
Answer ALL the questions.
2.
Read ALL the questions carefully.
3.
Number the answers correctly according to the numbering system used in this
question paper.
4.
Drawings must be large, neat and clear.
5.
Start each question on a NEW page.
6.
Write neatly and legibly.
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QUESTION 1: TOOLS
1.1
1.2
1.3
FIGURE 1, DIAGRAM SHEET 1 (attached) shows a squaring shear. Name
the parts A to F.
(6)
FIGURE 2, DIAGRAM SHEET 1 (attached) shows a pneumatic rivet gun.
Name the parts A to E.
(5)
Name the FOUR colours of Cleco fasteners used during riveting.
(4)
[15]
QUESTION 2: MATERIAL
2.1
2.2
Describe the following properties when referring to metals.
examples of the metals who have these properties.
Give also
2.1.1
Fatigue resistance
(2)
2.1.2
Ductility
(2)
2.1.3
Elasticity
(2)
2.1.4
Malleability
(2)
2.1.5
Brittleness
(2)
What does each of the following letters mean in the temper designation
system for aluminium rivets?
2.2.1
2.2.2
2.2.3
2.2.4
2.2.5
F
O
H
T
W
(5)
[15]
QUESTION 3: RIVETS
3.1
State FOUR precautions upon which the strength of a rivet depends.
3.2
Make a sketch to show the maximum rivet length and the buck tail size.
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(4)
(6)
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QUESTION 4: FUEL TANKS
Describe the soap solution test when repairing fuel tanks under the following headings:
4.1
Testing prior to repairs
4.2
Testing after repairs
(4)
(6)
[10]
QUESTION 5: CONSTRUCTION
5.1
FIGURE 3, DIAGRAM SHEET 2 (attached) shows an aircraft's wing. Label
the wing parts from A – J.
[10]
QUESTION 6: DRAWINGS
6.1
Name FIVE types of drawings used in the aircraft industry.
6.2
Make neat labelled sketches to explain joggling.
(5)
(10)
[15]
QUESTION 7: DEVELOPMENT
FIGURE 4, DIAGRAM SHEET 2 (attached) shows a transitional sheet-metal article in
the shape of a truncated cone. Copy the given views in your ANSWER BOOK and
develop the article. Show the full development using scale 1:1.
QUESTION 8: GENERAL
Indicate whether the following statements are TRUE or FALSE. Choose the answer
and write only 'true' or 'false' next to the question number (8.1 – 8.10) in the ANSWER
BOOK.
8.1
The micrometer is a precision measuring instrument and is used to obtain
measurements of up to ONE HUNDREDTH of a millimetre.
8.2
Straight-jaw tin snips are used to cut metal in straight lines or circles.
8.3
Hand reamers are available in standard and adjustable sizes.
8.4
Conductivity is the property which enables a metal to carry heat or electricity.
8.5
Strength is ONE factor when selecting rivets.
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8.6
Aldolizing is the most common surface treatment of non-clad aluminium alloy
surfaces.
8.7
Countersunk rivet heads are marked by a cross.
8.8
Black is the colour coding of 4,8 mm Cleco fasteners.
8.9
Torsion is the stress that produces twisting.
8.10
Continuous thick lines are used for visible outlines on engineering drawings.
TOTAL:
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DIAGRAM SHEET 1
FIGURE 1
FIGURE 2
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DIAGRAM SHEET 2
FIGURE 3
FIGURE 4
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