YEAR 10 (2nd Yr) GRAPHICAL COMMUNICATION MARKING SCHEME

DIRECTORATE FOR QUALITY AND STANDARDS IN EDUCATION Department of Curriculum Management Educational Assessment Unit

Annual Examinations 2017

YEAR 10 (2nd Yr) GRAPHICAL COMMUNICATION MARKING SCHEME

Question No. 1

Sectional Views

drawing faint projection lines from End View and Plan to Front View drawing the tunnel shaped inner part of the drawing drawing the centre-line and the vertical hole drawing the centre-lines and the two horizontal holes completing the two webs correct hatching presentation / neatness and accuracy

Total marks for question No. 1

1 2 2 2 2 4 2

15

Question No. 2

Involute

extending the sides of the quadrilateral in the right direction

4

drawing the correct arcs with centres at each corner of the quadrilateral

4

finishing the drawing

2

presentation / neatness and accuracy

2

Total marks for question No. 2

12

Question No. 1

Question No. 2

Graphical Communication ? Marking Scheme ? Year 10 (2nd Yr) ? 2017

Page 1 of 4

Question No. 3

Developments

dividing the circle into twelve parts projecting lines from the circle divisions to the Front View projecting lines from the Front View to the right marking the twelve divisions as base of the development erecting lines from these divisions to intersect horizontal lines marking the correct points to form the development finishing the drawing presentation / neatness and accuracy

Total marks for question No. 3

Question No. 4

Ellipse

constructing the part ellipse using any correct method locating the focal points constructing the Normal at M reflecting the Normal to the other side finishing the drawing presentation / neatness and accuracy

Total marks for question No. 4

1 1 1 2 2 4 2 1

14

5 2 2 1 2 2

14

Question No. 3

Question No. 4

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Graphical Communication ? Marking Scheme ? Year 10 (2nd Yr) ? 2017

Question No. 5

Perspective Projection

marking the length & width on base line and the height on vertical line

1

joining VP1 to VP2

1

erecting a line from the marked length and width to join top horizontal line 1

finding the mid-point M between the two vertical lines

1

forming the crate

2

marking dimensions on the vertical line and on the horizontal base line

2

directing all markings towards VP1, VP2 and point M as necessary

4

forming the two letters O and C

5

presentation / neatness and accuracy

1

note: any other correct construction method is accepted

Total marks for question No. 5

18

Question No. 5

Graphical Communication ? Marking Scheme ? Year 10 (2nd Yr) ? 2017

Page 3 of 4

Question No. 6

Circles in Contact

obtaining the centre and drawing the arc AC drawing R40 arc with centre at D

drawing R15 arc with centre at E drawing R10 arc with centre at G obtaining the centre and drawing the R50 arc obtaining the centre and drawing the R78 arc marking points of tangency presentation / neatness and accuracy

Total marks for question No. 6

3 1

1 1 3 3 1 2

15

Question No. 7

Linear Enlargement & Reduction

drawing faint radial lines from P to all corners and two centre-lines

2

drawing two lines to the centre of the arc

1

starting from A1B1, enlarge the figure proportionally using parallel lines

5

draw the enlarged arc and circle

2

presentation / neatness and accuracy

2

Total marks for question No. 7

12

Question No. 6

Page 4 of 4

Question No. 7

Graphical Communication ? Marking Scheme ? Year 10 (2nd Yr) ? 2017

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