university of malta secondary education certificate …

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 4 constructing the tangent to the ellipse at point P 2 constructing the normal to the ellipse at point Q 2 constructing the semi-circle QR 2

Total marks for question No. 1 10

Tangential Arcs / Circles in Contact Question No. 2 drawing the 12 mm radius arc from point A on the given centre 1 drawing the semi-circle radius 6 mm 1 drawing the 32 mm radius arc from point B on the given centre 1 drawing the 40 mm radius arc from point C on the given centre 1 adding 12+12 and drawing the 24mm radius from the centre A 1 extending a line from P to C to draw the 70mm radius arc 2 adding the radius 32 and rad 12 and drawing the arc from centre B to intersect the 70 and 12 mm radius

2

blending the arc of 12mm with the 70 mm and the 32mm Rad arc 1 constructing the tangent at X 2 constructing the tangent at Y 2 neatness and presentation 1

Total marks for question No. 2 15 Question No 1. Question No. 2

Construction of polygon

Question No. 3 bisecting the given side AB and BC to locate the centre of the circle/pentagon

2

drawing the circle passing through the points ABC and completing the pentagon

3

extending the lines OA,OB etc 1 bisecting two angles, to locate the centre of the arc 2 drawing the five arcs 3 drawing the inner 5 pointed star 1 lining in the inner pentagon by bold lines 1


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.

2

locating and drawing the two semi-circles 2 drawing the two enlarged circles 3 establishing the diameter of the enlarged circle of the keyhole 3 locating and drawing the position of the tapered slot 3 completing the view 1


Question No.3 Question No. 4

Orthographic view Question No. 5 positioning and locating the end view 1 projecting and drawing the horizontal lines representing the Ø15 hole and Ø 20 mm counterbore (left boss)

2

projecting and drawing the 7 mm thick base of the bracket 1 projecting and drawing the 14 mm slot 2 projecting and drawing the 7 mm web of the bracket 2 representing the 10 mm step at the back of the bracket 2 placing the fillet radii and lining in elevation 1 drawing correctly all hatching lines 3 N.B. deduct 2 marks for incorrect section lines


Isometric projection Question No. 6

constructing the two right hand arcs of the piano 4

locating and drawing the left hand arcs of the piano 2

lining in the isometric lines 3

constructing the two 25mm top quadrants 4 locating and drawing the lower elliptical curve of the piano 1

lining in neatly the outline 2 Total marks for question No.6 16

Question No.5 Question No. 6

Two Point Perspective View Question No. 7 lining in the base of the shelter 2 lining in the upper tapered roof of the shelter 3 drawing the left hand side including the glass pane of the perspective 4 drawing the right hand side wall of the perspective 3 locating and drawing the seating slab 2 placing the three bench supports 3 completing the view with proper outline 1 Total marks for question No. 7 18

Question No. 7

PAPER 2A

Polygon of forces Question No. 1 drawing the four forces parallel to the given space diagram and to the correct scale length

4

completing the polygon and finding the magnitude and direction of the resulting force

4

writing the magnitude and direction in the space provided 2 Total marks for question No. 1 10

Computer Programme Question No. 2 producing the image of the lable by drawing the: (i) green border - (4) lines 3 (ii) blue base - (5) lines 5 (iii) black handle - (2) lines 2 (iv) red X - (2) lines 2


Question No. 1 Question No. 2

Safety Sign Question No. 3(a) producing the preliminary sketch and relevant ideas 3

Total marks for question No. 3(a) 3

Question No. 3 (b)

(i) drawing of suitable logo depicting head and cap/band 4

(ii) enhancing the logo by using different colours 3

(iii) the colours conform with the health and safety regulations 2 Total marks for question No. 3(b) 9 Total marks for question No. 3(a) and (b) 12

Cycloid Question No. 4 dividing the right hand generating circle into a number of parts 2 calculating the length of half the circumference and plotting the path of point P from point A to point B

5

plotting the path of the point P from point B to point C 1 drawing the path of point P as circle rolls from point C to point D 4 lining in using the proper outline 2

Total marks for question No 4 14


Curve of Intersection and Development Question No. 5 (a) drawing the outline of the box in the front elevation 2 dividing the semi-circle in the end view into a number of parts 1 projecting these divisions/lines onto the plan and front view 2 locating and drawing the curves of intersection to complete the view 4 Total marks for question No. 5 (a) 9 Question No. 5(b) measuring the distances from the plan (corner C) and transferring these divisions on the given line marked C (development)

4

by projection lines, locating the points to obtain the true shape of the required pierced hole

3

lining in neatly by a bold curve the outline of the development 2 Total marks for question No. 5 (b) 9

Total marks for question No. 5(a) and (b) 18

Question No. 5

True shape and Development Question No. 6 (a) completing the given plan 2 dividing the plan into a number of parts and projecting these generators on the front elevation

1

measuring the widths of the chords and transferring these widths to locate the points of the outer curve and drawing the profile

5

lining in the inner shape 3 Total marks for question No. 6 (a) 11

Question No. 6 (b) using proper construction to obtain the true length of the pyramid 1

drawing the surface development of the whole square pyramid 2

finding the true length of the section and completing the development 4 Total marks for question No. 6 (b) 7

Total marks for question No. 6 (a) and (b) 18

Auxiliary View Question No. 7 dividing the front and end view into an adequate number of parts by horizontal construction lines

2

projecting these lines at 45° onto the printed X-Y line 2 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 4 (ii) the cross 2 (iii) the lower part of the anchor 6 drawing the profile of the anchor by means of bold lines and smooth curves to produce a neat presentation of the anchor

2

Total marks for question No. 7 18 Question No.6 Question No. 7

PAPER 2B

Polygon of forces Question No. 1 drawing the three forces parallel to the given space diagram and to the correct scale length

4

completing the polygon and finding the magnitude and direction of the resulting force

4

writing the magnitude and direction in the space provided 2 Total marks for question No. 1 10

Computer Programme Question No. 2 producing the image of the lable by drawing the: (i) blue base – (5) lines 6 (ii) red sloping – (1) line 3 (iii) green horizontal part – (1) line 3

Total marks for question No. 2 12 Question No. 1 Question No. 2

Safety Sign Question No. 3(a) producing the preliminary sketch and relevant ideas 3

Total marks for question No. 3(a) 3

Question No. 3 (b)

(i) drawing of suitable logo depicting neck tie/scarf 4

(ii) enhancing the logo by using different colours 3

(iii) the colours conform with the health and safety regulations 2 Total marks for question No. 3(b) 9 Total marks for question No. 3(a) and (b) 12

Cycloid Question No. 4 dividing the generating circle into a number of parts 2 calculating the length of the circumference 2 locating geometrically the path of point P 6 drawing the locus of point P by a neat and smooth curve 2 completing the drawing 2

Total marks for question No 4 14


Line of Intersection and Development Question No. 5 (a) drawing the outline of the box in the front elevation 2 drawing lines from the corners of the half octagon from the end view to the front elevation and onto the plan

2

locating and drawing the lines of intersection to complete the view 5 Total marks for question No. 5 (a) 9 Question No. 5(b) measuring the distances from the plan (corner C) and transferring these divisions on the given vertical line marked C (development)

4

by projection lines, locating the points to obtain the true shape of the required pierced hole

3

lining in neatly by bold lines the outline of the development 2 Total marks for question No. 5 (b) 9

Total marks for question No. 5(a) and (b) 18

Question No. 5

True shape and development Question No. 6 (a) completing the given plan 2 dividing the plan into a number of parts and projecting these generators on the front elevation

1

measuring the widths of the chords and transferring these widths to locate the points of the outer curve and drawing the half profile

5

lining in half the inner shape 3 Total marks for question No. 6 (a) 11

Question No. 6 (b) using proper construction to obtain the true length of the pyramid 1

drawing the surface development of the whole square pyramid 2

finding the true length of the section and completing the development 4 Total marks for question No. 6 (b) 7 Total marks for question No. 6 (a) and (b) 18

Auxiliary View

Question No. 7 dividing the front and end view into an adequate number of parts by horizontal construction lines

2

projecting these lines at 45° onto the printed X-Y line 2 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 4 (ii) drawing the middle part of the anchor 2 (iii) the lower part of the anchor 6 drawing the profile of the anchor by means of neat, bold lines and smooth curves to produce a neat presentation of the anchor

2



university of malta secondary education certificate …

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