Marking Scheme...Marking Scheme (Main Session 2019): SEC Graphical Communication Page 3 of 22 PAPER...

Marking Scheme SEC Graphical Communication

Main Session 2019

MATSEC Examinations Board

Marking Scheme (Main Session 2019): SEC Graphical Communication

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Marking schemes published by the MATSEC Examination Board are not intended to be standalone documents. They are an essential resource for markers who are subsequently monitored through a verification process to ensure consistent and accurate application of the marking scheme.

In the case of marking schemes that include model solutions or answers, it should be noted that these are not intended to be exhaustive. Variations and alternatives may also be acceptable. Examiners must consider all answers on their merits, and will have consulted with the MATSEC Examinations Board when in doubt.


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PAPER 1

Question 1 – Geometry

Geometry No 1

Dividing and marking the 12 tick marks 2

Drawing the two equilateral triangles 2

Lining in the six-pointed star 4

Overall finishing and neatness 2

Total 10


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Question 2 – Polar Enlargement

Polar Enlargement No 2

Projecting lines from point P 2

Drawing the bottom floor profile 2

Drawing the middle floor profile 2

Drawing the top floor profile with the dome 3

Drawing the clock circles 3

Drawing the inner windows (using an extra point) 4

Neatness and accuracy 2

Total 18


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Question 3 – Ellipse & Circles in contact

Ellipse & Circles in contact No 3

Use any approved method to draw the semi ellipse at the bottom (deduct ½ mark if major and minor axis have incorrect measurement)

4

Line in the elliptical curve neatly and smoothly 2

Find the focal points and construct the tangent at point X, extend the perpendicular line. (just extending perpendicular line 1 mark.)

4

Drawing circle R28mm from A 1

Constructing tangent from point P to R28mm 2

Drawing circle R20mm from B 1

Constructing inside tangent between 2 circles of diff. diameters (Tangents with no constructions 1 mark.)

3

Finding the centres and constructing R 90mm & R30 2


Total 20


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Question 4 – Sectioning

Sectioning No 4

Project the lines from the plan to A-A 1

Draw the left circle 1

Correctly line the main shaft and the holes on the right. 1

Lining in the correct profile 1

and apply correct sectioning lines (ribs not sectioned) 1 mark saw cut not sectioned, 1 mark webs not sectioned, 1 mark right hole, 1 mark hatching remaining.

4

Draw the 3 centre lines (drawing straight lines instead of centre lines – no marks.

3

Add 2 radial and 2 linear dimensions 4


Total 16


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Question 5 – Quadrilateral and triangle construction

Quadrilateral and triangle constructions No 5

Label shape ABCD as TRAPEZIUM 2

Construct equilateral triangle TUV (using protractor / setsquares from vertex) 3

Find the centre of ARC KL using chord theorem 4

Construct angle XWY angle 75° using compasses 1

Deduct 42 from 160 = 118 and draw line WY 118. 1

Construct triangle WXY using triangle construction having base, base angle + perimeter

3

Rendering the Bunsen burner and the stand in shiny metal 4

Total 18


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Question 6 – two-point Perspective

Two Point Perspective No 6

Project lines from A to VP1 and VP2 1

Use any approved method and construct a crate 1

Transfer the measurements to the crate 2

Constructing the 4 legs 2

Constructing the top shelf 2

Constructing the top 5mm border including chamfer 2

Constructing the bottom shelf 4

Constructing the middle partition 1

Finishing off the drawing 2


Total 18


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PAPER 2A

Question 1 – Computer graphics

Computer graphics No 1

Writing down E , G & H , F as the answers of the first part 1

Drawing the black command (1) 1

Drawing the blue commands (2) 2

Drawing the red commands (4) 2

Mirroring the design on the two lines of symmetry 3


Total 10


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Question 2 – Ideograms, charts and graphs

Ideograms, Charts & Graphs No 2

Design THREE sketches and ONE final icon for each pet + colour (3 marks each set)

9

Copy a smaller version of the final icon in Table B (icon) 1

Write down the star rating of the missing pets, 9,4,6 in (Table B) 1

Draw 1 & 1/2 stars for Fish in Pictograph A 1

Total 12

Question 3 – Free


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Freehand and Orthographic projection

Freehand and Orthographic projection No 3

Sketch the front, end & plan of the book in first angle projection 3

Draw the book mark and chalice design 1

Sketch the Isometric view of the elevations 4

Lining in the correct outlines and smooth isometric curves 1

Overall Presentation 1

Total 10


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Question 4 – Involute and Archimedean spiral

Involute and Archimedean spiral No4

Divide circle centre C into a number of equal parts 1

Project perpendicular lines from each division 1

Plot the points and line in the involute of a circle (final radial = 125 mm) 2

Draw the supports 1

Draw radials on point O (normally 12) 1

Divide A1-B1 into the same number of radials (normally 12) 2

Plot the points and line in the Archimedean spiral 2

Draw the second Archimedean spiral from A2 – B2 4


Total 16


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Question 5 – True lengths and developments

True lengths and developments No 5

Projecting the truncation on the plan 2

Projecting the End elevation 3

Drawing the hidden line in the End Elevation 1

Finding the true lengths of the sides 2

Constructing the development 3

Finding the true lengths of the cut 1

Drawing the true shape 2

Writing down the True lengths, EG=54, EF=55, GF=42 1


Total 16


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Question 6 – Assembly

Assembly No 6

Drawing the base in the plan including chamfers 2

Drawing the R15mm body in the plan 1

Drawing the 4 fins in the plan including the hidden details 4

Drawing the base in the front including chamfers 2

Drawing the cylindrical body in the front 1

Drawing the conical top in the front 1

Drawing the 2 side and 1 central fin 3

Adding hidden details of the fins, top and bottom dowels 3


Total 18


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Question 7 – Auxiliary projection

Auxiliary projection No 7

Project the lines from the plan to X1-Y1 1

Construct the first step 2

Construct the second step 2

Divide the middle circle into a number of parts and project on the auxiliary 4

Divide the side quadrants into a number of parts and project on the auxiliary 4

Draw the top 2

Finish off the depths 2

Finishing, neatness and accuracy 1

Total 18


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PAPER 2B

Question 1 – Computer graphics--

Computer graphics No 1

Drawing the black command (1) 1

Drawing the blue commands (2) 2

Drawing the red commands (2) 2

Mirroring the design on the two lines of symmetry 4


Total 10


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Question 2 – Ideograms, charts and graphs

Ideograms, Charts & Graphs No 2

Design THREE sketches and ONE final icon for birds + colour 4

Design THREE sketches and ONE final icon for fish + colour 4

Copy a smaller version of the final icons in Table B 1

Write down the star rating of the missing pets - birds 6 1

Draw 2 stars for Cats in Pictograph A 1


Total 12

Question 3 – Freehand and Ort


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Freehand and Orthographic projection

Freehand and Orthographic projection No 3

Sketch the front, end & plan of the match box in first angle projection 3

Draw the matches and flint designs 1

Sketch the Isometric view of the elevations 4

Lining in the correct outlines and smooth isometric curves 1

Presentation 1

Total 10


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Question 4 – Involute and Archimedean spiral

Involute and Archimedean spiral No4

Divide circle centre C into a number of equal parts 1

Project perpendicular lines from each division 2

Plot the points and line in the involute of a circle (final radial = 125 mm) 3

Draw the supports 1

Draw radials on point O (normally 12) 1

Divide A-B into the same number of radials (normally 12) 2

Plot the points and line in the Archimedean spiral 4


Total 16


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Question 5 – True lengths and developments

True lengths and developments No 5

Projecting the truncation on the plan 2

Projecting the End elevation 3

Drawing the hidden line in the End elevation 1

Finding the true lengths of the sides 2

Constructing the development 3

Finding the true lengths 1

Drawing the true shape 2

Writing down the True lengths, EG=55, EF=55, GF=35 1


Total 16


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Question 6 – Assembly

Assembly No 6

Drawing the base in the front including chamfers 4

Drawing the cylindrical body in the front 3

Drawing the conical top in the front 2

Drawing the 2 sides and 1 central fin 3

Adding hidden details of the fins and top dowel 4


Total 18


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Question 7 – Auxiliary projection

Auxiliary projection No 7

Project the lines from the plan to X1-Y1 2

Construct the second step 2

Divide the middle circle into a number of parts and project on the auxiliary 5

Project the side slopes on the plan and project on the auxiliary 4

Draw the top 2

Finish off the depth 1

Finishing, neatness and accuracy 2

Total 18

Marking Scheme...Marking Scheme (Main Session 2019): SEC Graphical Communication Page 3 of 22 PAPER...

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