UNIVERSITY OF MALTA
THE MATRICULATION CERTIFICATE EXAMINATION
INTERMEDIATE LEVEL
GRAPHICAL COMMUNICATION &
ENGINEERING DRAWING
May 2012
MARKING SCHEME
MATRICULATION AND SECONDARY EDUCATION
CERTIFICATE EXAMINATIONS BOARD
SECTION A
Hyperbola and Parabola as plane locus of point
Question No. 1 (a)
drawing the outline of the triangle, of height 95 and vertex angle 90º
1
drawing the directrix, axis, and vertex. Locating the position of the
focus, using the given eccentricity of 3:2
1
construction of the ratio of the hyperbola with the proportion of 3:2 of
each successive point by using a scaled line
1
plotting the position of the points of the hyperbola by lines and arcs
2
joining the intersecting arc and lines of the hyperbola by a smooth
curve and terminating at the horizontal line
2
Total marks for question No. 1 (a)
7
Question No. 1 (b)
using an appropriate method to construct the parabola within the given
rectangle 240 by 80
locating by construct the position of the focus, showing the method
clearly
3
locating and drawing the position of the directric of the parabola
1
2
Total marks for question No. 1 (b)
6
Total marks for question No. 1 (a) and (b)
13
Transition piece
Question No. 2 (a)
copying the given plan and the front elevation of the transition piece
Total marks for question No. 2 (a)
2
1
1
Question No. 2 (b)
dividing the elev and plan into a number of parts
1
constructing the true lengths of the slant heights of the transition piece
3
Total marks for question No. 2 (b)
4
Question No. 2 (c)
plotting the width of each sector of the base of the transition piece and
true length of each slant height by intersecting arcs to draw a onefourth surface development of the transition piece
6
correct drawing of one-fourth development of the transition piece
2
Total marks for question No. 2 (c)
8
Total marks for question No. 2 (a), (b) and (c)
13
Right cylinder to Rectangular Pyramid
Question No. 3 (a)
copying the given front elevation
1
Total marks for question No. 3 (a)
1
Question No. 3(b)
constructing the plan substituting the cylinder by two lines (0.5each)
and two curves (1.5 each) representing the curves of intersection on
the rectangular pyramid
Total marks for question No. 3 (b)
4
4
Question No. 3(c)
selecting a number of points on the front elevation and plan passing
through the curve of intersection
3
1
finding the true lengths of these lines
3
constructing the surface development of the three sides of the pyramid
4
Total marks for question No. 3 (c)
8
Total marks for question No 3(a), (b) and (c)
13
Displacement Diagram and Disc Cam
Question No. 4 (a)
Simple Harmonic Motion - Rise of 60mm from 0º to 150ºº
1.5
Top Dwell
- Rest from150º to 180º
0.5
Uniform Acceleration
- Fall of 25mm from 180º to 240º
1.5
Uniform Retardation
- Fall of 25mm from 240º to 300º
1.5
Uniform Velocity
- Fall of 10mm from 300º to 360º
1
Total marks for question No. 4 (a)
Question No. 4 (b)
Plotting of points and position of roller follower for all points,
6
2
lining in the cam profile tangential to each roller-ended circle and
annotation
3
correct rotation of the cam
2
incorrect rotation of the cam – deduct 2 marks
Total marks for question No. 4 (b)
7
Total marks for question No. 4 (a) and (b)
13
4
Forces on Beam
Question No. 5 (a)
copying the linear diagram to a scale of 10mm representing 1m
1
Total marks for question No. 5 (a)
1
Question No. 5 (b)
constructing the load line using a force scale of 10mm reps 1kN,
1
the Polar diagram with a polar
1
Total marks for question 5 (b)
2
Question No5 (c)
drawing the shear force diagram
2
and the bending moment diagram
2
using a clear notation system
1
Total marks for question 5 (c)
Question No5 (d)
calculating and writing down the magnitude on the left
5
3.333kN.
calculating and writing down the magnitude of the Reaction on the
right 0.766kN.
Total marks for question 5 (d)
Total marks for question No. 5(a), (b), (c) and (d)
5
2.5
2.5
5
13
SECTION B
Orthographic View (Parts of a Spraying Unit)
Question No. 6
drawing of the left-hand upright of the bracket including the 3mm
undercut and the two Ø 8 bossed holes
3
drawing the Ø 35 x 45mm upright cylinder to suit the column
1
drawing of the two webs in position and correctly sectioned
4
NOTE: deduct 2 marks if hatching not correct
locating and drawing correctly the slider column in position to suit the
slider
drawing of the M15 x 1.5mm nut and washer correctly in position and
not shown in section
2
3
locating the slider (15mm above the bossed face A) and drawing of the
slider accurately in position and showing both M10x1 and M8x1
threaded holes
4
slider correctly sectioned
2
NOTE: deduct 1 mark if hatching not correct
locating correctly the M8 x 1mm slider locking screw and knurling
correctly indicated using proper convention
presentation and neatness
3
2
Total marks for question No. 6
24
Isometric view (Pressure Cam)
Question No. 7
drawing of a crate 132.5mm x 76mm x 128mm
1
drawing of the Ø75 x 76mm collar
4
drawing of the Ø 30 hole including the 6mm wide keyway
4
6
locating and drawing the R68 front part arc
4
lining in the rear R68 arc and completing both curves
2
locating and drawing the 24mm square top prism
3
locating and drawing the 14mm wide stiffening web
4
neatness and presentation
2
Total marks for question No. 7
24
SECTION C
Presentation of Logo
Question No 8
a) writing short phrases or keywords associated with the given brief
3
b) producing a series of sketches that indicate the candidate’s
developing idea
6
c) identifying elements in the sketches that the candidate intends to use
in the final image.
1
d) drawing the final realisation in a square 150mm x 150mm.
10
d i) enhancing the solution using two to three colours.
3
d ii) presenting a neat layout on the drawing paper preferably as
suggested by the examiner.
1
Total marks for question No.8
24
Single-Point Perspective Drawing
Question No 9
drawing the picture plane 490mm x 280mm
0.5
placing the vanishing point in the suggested position
0.5
7
marking the 14 floor tiles (35mm sq) and the 8 (35mm) wall stone
courses on the picture plane
2
locating (by construction) the wall opposite to the picture plane
1
drawing the 35mm x 35mm floor tiles converging to the v.p.
5
locating and drawing the soffit ceiling and the artificial beams ‘A’
3
locating and drawing the counter ‘A’
2
locating and drawing the pizza oven ‘B’
2
locating and drawing the table ‘C’
2
locating and drawing the two benches ‘D’
2
locating and drawing the wall table ‘E`
1
locating and drawing the two stools ‘E`
1
locating and drawing the lighting and wall decorations
1
rendering the drawing
1
Total marks for question No.8
8
24