UNIVERSITY OF MALTA
SECONDARY EDUCATION CERTIFICATE
SEC
GRAPHICAL COMMUNICATION
May 2011
MARKING SCHEME
MATRICULATION AND SECONDARY EDUCATION
CERTIFICATE EXAMINATIONS BOARD
PAPER 1
Ellipse / Normal
Question No. 1
proper construction of the upper half of the ellipse, using any recognized method
constructing the tangent to the ellipse at point P
constructing the normal to the ellipse at point Q
constructing the semi-circle QR
Total marks for question No. 1
4
2
2
2
10
Tangential Arcs / Circles in Contact
Question No. 2
drawing the 12 mm radius arc from point A on the given centre
drawing the semi-circle radius 6 mm
drawing the 32 mm radius arc from point B on the given centre
drawing the 40 mm radius arc from point C on the given centre
adding 12+12 and drawing the 24mm radius from the centre A
extending a line from P to C to draw the 70mm radius arc
adding the radius 32 and rad 12 and drawing the arc from centre B to
intersect the 70 and 12 mm radius
blending the arc of 12mm with the 70 mm and the 32mm Rad arc
constructing the tangent at X
constructing the tangent at Y
neatness and presentation
Total marks for question No. 2
Question No 1.
1
1
1
1
1
2
2
1
2
2
1
Question No. 2
15
Construction of polygon
Question No. 3
bisecting the given side AB and BC to locate the centre of the
circle/pentagon
drawing the circle passing through the points ABC and completing the
pentagon
extending the lines OA,OB etc
bisecting two angles, to locate the centre of the arc
drawing the five arcs
drawing the inner 5 pointed star
lining in the inner pentagon by bold lines
Total marks for question No. 3
Linear Enlargement of keyhole plate
Question No. 4
drawing the horizontal lines from A1 and B1, intersecting at the lines
extended from the centre of the keyhole, corresponding from the
horizontals of A and B.
locating and drawing the two semi-circles
drawing the two enlarged circles
establishing the diameter of the enlarged circle of the keyhole
locating and drawing the position of the tapered slot
completing the view
Total marks for question No. 4
Question No.3
Question No. 4
2
3
1
2
3
1
1
13
2
2
3
3
3
1
14
Orthographic view
Question No. 5
positioning and locating the end view
projecting and drawing the horizontal lines representing the Ø15 hole
and Ø 20 mm counterbore (left boss)
projecting and drawing the 7 mm thick base of the bracket
projecting and drawing the 14 mm slot
projecting and drawing the 7 mm web of the bracket
representing the 10 mm step at the back of the bracket
placing the fillet radii and lining in elevation
drawing correctly all hatching lines
N.B. deduct 2 marks for incorrect section lines
Total marks for question No. 5
Isometric projection
Question No. 6
constructing the two right hand arcs of the piano
locating and drawing the left hand arcs of the piano
lining in the isometric lines
constructing the two 25mm top quadrants
locating and drawing the lower elliptical curve of the piano
lining in neatly the outline
Total marks for question No.6
Question No.5
Question No. 6
1
2
1
2
2
2
1
3
14
4
2
3
4
1
2
16
Two Point Perspective View
Question No. 7
lining in the base of the shelter
lining in the upper tapered roof of the shelter
drawing the left hand side including the glass pane of the perspective
drawing the right hand side wall of the perspective
locating and drawing the seating slab
placing the three bench supports
completing the view with proper outline
Total marks for question No. 7
Question No. 7
2
3
4
3
2
3
1
18
PAPER 2A
Polygon of forces
Question No. 1
drawing the four forces parallel to the given space diagram and to the
correct scale length
completing the polygon and finding the magnitude and direction of the
resulting force
writing the magnitude and direction in the space provided
Total marks for question No. 1
Computer Programme
Question No. 2
producing the image of the lable by drawing the:
(i) green border - (4) lines
(ii) blue base - (5) lines
(iii) black handle - (2) lines
(iv) red X - (2) lines
Total marks for question No. 2
Question No. 1
4
4
2
10
3
5
2
2
Question No. 2
12
Safety Sign
Question No. 3(a)
producing the preliminary sketch and relevant ideas
Total marks for question No. 3(a)
Question No. 3 (b)
(i) drawing of suitable logo depicting head and cap/band
(ii) enhancing the logo by using different colours
(iii) the colours conform with the health and safety regulations
Total marks for question No. 3(b)
Total marks for question No. 3(a) and (b)
3
3
4
3
2
9
12
Cycloid
Question No. 4
dividing the right hand generating circle into a number of parts
calculating the length of half the circumference and plotting the path
of point P from point A to point B
plotting the path of the point P from point B to point C
drawing the path of point P as circle rolls from point C to point D
lining in using the proper outline
Total marks for question No 4
Question No. 3
Question No. 4
2
5
1
4
2
14
Curve of Intersection and Development
Question No. 5 (a)
drawing the outline of the box in the front elevation
dividing the semi-circle in the end view into a number of parts
projecting these divisions/lines onto the plan and front view
locating and drawing the curves of intersection to complete the view
Total marks for question No. 5 (a)
Question No. 5(b)
measuring the distances from the plan (corner C) and transferring
these divisions on the given line marked C (development)
by projection lines, locating the points to obtain the true shape of the
required pierced hole
lining in neatly by a bold curve the outline of the development
Total marks for question No. 5 (b)
Total marks for question No. 5(a) and (b)
Question No. 5
2
1
2
4
9
4
3
2
9
18
True shape and Development
Question No. 6 (a)
completing the given plan
dividing the plan into a number of parts and projecting these
generators on the front elevation
measuring the widths of the chords and transferring these widths to
locate the points of the outer curve and drawing the profile
lining in the inner shape
Total marks for question No. 6 (a)
Question No. 6 (b)
using proper construction to obtain the true length of the pyramid
drawing the surface development of the whole square pyramid
finding the true length of the section and completing the development
Total marks for question No. 6 (b)
2
1
5
3
11
1
2
4
7
Total marks for question No. 6 (a) and (b)
Auxiliary View
Question No. 7
dividing the front and end view into an adequate number of parts by
horizontal construction lines
projecting these lines at 45° onto the printed X-Y line
carefully measuring the widths from the end view and transferring
these widths on the lines constructed to draw:
(i) the four ellipses at the top
(ii) the cross
(iii) the lower part of the anchor
drawing the profile of the anchor by means of bold lines and smooth
curves to produce a neat presentation of the anchor
Total marks for question No. 7
Question No.6
Question No. 7
18
2
2
4
2
6
2
18
PAPER 2B
Polygon of forces
Question No. 1
drawing the three forces parallel to the given space diagram and to the
correct scale length
completing the polygon and finding the magnitude and direction of the
resulting force
writing the magnitude and direction in the space provided
Total marks for question No. 1
Computer Programme
Question No. 2
producing the image of the lable by drawing the:
(i) blue base – (5) lines
(ii) red sloping – (1) line
(iii) green horizontal part – (1) line
Total marks for question No. 2
Question No. 1
4
4
2
10
6
3
3
Question No. 2
12
Safety Sign
Question No. 3(a)
producing the preliminary sketch and relevant ideas
Total marks for question No. 3(a)
Question No. 3 (b)
(i) drawing of suitable logo depicting neck tie/scarf
(ii) enhancing the logo by using different colours
(iii) the colours conform with the health and safety regulations
Total marks for question No. 3(b)
Total marks for question No. 3(a) and (b)
3
3
4
3
2
9
12
Cycloid
Question No. 4
dividing the generating circle into a number of parts
calculating the length of the circumference
locating geometrically the path of point P
drawing the locus of point P by a neat and smooth curve
completing the drawing
Total marks for question No 4
Question No. 3
2
2
6
2
2
14
Question No. 4
Line of Intersection and Development
Question No. 5 (a)
drawing the outline of the box in the front elevation
drawing lines from the corners of the half octagon from the end view
to the front elevation and onto the plan
locating and drawing the lines of intersection to complete the view
Total marks for question No. 5 (a)
Question No. 5(b)
measuring the distances from the plan (corner C) and transferring
these divisions on the given vertical line marked C (development)
by projection lines, locating the points to obtain the true shape of the
required pierced hole
lining in neatly by bold lines the outline of the development
Total marks for question No. 5 (b)
Total marks for question No. 5(a) and (b)
Question No. 5
2
2
5
9
4
3
2
9
18
True shape and development
Question No. 6 (a)
completing the given plan
dividing the plan into a number of parts and projecting these
generators on the front elevation
measuring the widths of the chords and transferring these widths to
locate the points of the outer curve and drawing the half profile
lining in half the inner shape
Total marks for question No. 6 (a)
Question No. 6 (b)
using proper construction to obtain the true length of the pyramid
drawing the surface development of the whole square pyramid
finding the true length of the section and completing the development
Total marks for question No. 6 (b)
Total marks for question No. 6 (a) and (b)
2
1
5
3
11
1
2
4
7
18
Auxiliary View
Question No. 7
dividing the front and end view into an adequate number of parts by
horizontal construction lines
projecting these lines at 45° onto the printed X-Y line
carefully measuring the widths from the end view and transferring
these widths on the lines constructed to draw
(i) the four ellipses at the top
(ii) drawing the middle part of the anchor
(iii) the lower part of the anchor
drawing the profile of the anchor by means of neat, bold lines and
smooth curves to produce a neat presentation of the anchor
Total marks for question No. 7
Question No. 6
Question No. 7
2
2
4
2
6
2
18