2013 l.84-85 ms -15 cm-final l.84/85_ms 12/20 the drawing on the right show (b) (b) (a) a-3. the 3d...

2013 L.84/85_MS 1/20

L.84/85

Pre-Leaving Certificate Examination, 2013

Design & Communication Graphics

Marking Scheme

Ordinary Pg. 3 Higher Pg. 12

2013 L.84/85_MS 2/20

2013 L.84/85_MS 3/20

A-1. The 3D graphic below shows three candles. The drawing on the right shows the

plan and elevation of the sphere A. The plan of sphere B and the elevation of cone C which are in contact with sphere A are also shown. All solids rest on the horizontal plane.

(a) Draw the elevation of sphere B. (b) Draw the plan of cone C.

A-3. The 3D graphic below shows a

nest of tables. A set of isometric axes and a partially

completed outline drawing of the larger table are shown on the right. The elevation and partially completed plan of the table have been positioned relative to the axes as shown.

(a) Complete the plan of the table. (b) Compete the axonometric

projection.

A-2. The photograph below shows a bird house. The plan and incomplete elevation

of the bird house are shown on the right.

(a) Complete the elevation of

the outline of the bird house. (b) Draw an auxiliary elevation

of the birdhouse, on the given X1Y1, which will show the true angle between the two roof surfaces A and B.

A-4. A photograph of a bridge with a

parabolic support is shown. The drawing on the right shows the

directrix of the parabola and two points on the curve P and P1.

(a) Locate the focus, axis and

vertex of the parabola. (b) Locate at least four extra

points and draw a portion of the curve.

This examination paper must be returned at the end of the Examination – You must include your Name, School Name and Teacher Name on the front cover

SECTION A - Core - Answer Any Three of the questions on this A3 sheet

MARKING SCHEME Total (20) (a) Projection to elevation (3m) Centre of sphere (4m) Sphere (4m)

(b) Projection to plan (2m) Centre of cone (2m) Cone (3m)

Presentation (2m)

MARKING SCHEME Total (20) (a) Completion of plan (4m)

(b) Projection from plan (4m) Projection from elevation (4m) Establish end points (2m) Completion (4m)

Presentation (2m)

MARKING SCHEME

Total (20)

(a) Projection to elevation (3m) Heights (3m) Completion (3m)

(b) Projection to auxiliary (2m) Heights (2m) Completion (4m)

Presentation (3m)

MARKING SCHEME Total (20) (a) Arcs (4m) Focus, axis, vertex (6m)

(b) Construction (4m) Curve (4m)

Presentation (2m)

A

A

B

B

C

C

YX

Y1

X1

P

P1

DV

F

D

B

A

Y

X Y

Z X

D D

X Y

2013 L.84/85_MS 4/20

ExamCentre, Units 3/4, Fonthill Business Park, Fonthill Road, Dublin 22. Tel: (01) 616 62 62 Fax: (01) 616 62 63


Ordinary Level – Section (B)

L.84 Scale 1:1 Question B-1

MARKING SCHEME Total (45) (a) Elevation Outline (6m) Completion (4m) Plan Outline (7m) Completion (6m) (b) X1Y1 (2m) Projections (2m) Heights (2m) One Surface (3m) Completion (9m) Presentation (4m)

2013 L.84/85_MS 5/20





MARKING SCHEME Total (45) Set up (4m) Spectator (4m) PP, GL and HL (6m) Vanishing Points (4m) Sight Lines (4m) Base Outline (6m) Heights (4m) Sloping Surface (6m) Completion (3m) Presentation (4m)

2013 L.84/85_MS 6/20





MARKING SCHEME Total (45) (a) Octagon (6m) End view (6m) (b) Elevation (6m) (c) Outline of plan (6m) Hexagonal opening (6m) Curve (6m) Completion (5m) Presentation (4m)

2013 L.84/85_MS 7/20



Ordinary Level – Section (C)

L.84 Scale 1:1000 Question C-1

MARKING SCHEME Total (45) (a) Height lines (7m) Projectors (7m) Profile (8m) (b) Construction (4m) Indicate height (2m) (c) 5m parallel lines (5m) Plot points (4m) Curve (4m) Presentation (4m)

(Question C-1)

2013 L.84/85_MS 8/20





MARKING SCHEME Total (45) (a) Plan outline (6m) Elements (6m) Elevation outline (6m) Elements (7m) Curve (2m) (b) Outline (6m) Elements (6m) Curve (2m) Presentation (4m)

2013 L.84/85_MS 9/20





MARKING SCHEME Total (45) (a) Plan (6m) Elevation (6m) Completion (6m) (b) Base (5m) Plane vertical surfaces (6m) Curved surface (8m) Completion (4m) Presentation (4m)

2013 L.84/85_MS 10/20

Fig. C-4(a)

Fig. C-4(b)





MARKING SCHEME Total (45) (a) Outline (4m) Vertical divisions (2m) SHM construction (4m) Dwell (2m) UV construction (4m) Transfer to profile (4m) Path (3m) (b) Set up (5m) Construction (5m) Maximum (4m) Minimum (4m) Presentation (4m)

2013 L.84/85_MS 11/20





MARKING SCHEME Total (45) Relative positioning of components (8m) Scoop (7m) Handle (7m) Receiver (5m) Screw set (4m) Washer (2m) Drawing completion Hatching (4m) Centrelines (4m) Presentation (4m)

2013 L.84/85_MS 12/20

A-3. The 3D graphic below shows an office building. It is based on truncated hexagonal prisms.

The drawing on the right shows how a prism is truncated. (a) Draw the elevation of the prism when cut by the oblique plane VTH. (b) Determine, and indicate in degrees, the inclination of the cut surface to the vertical plane.

SECTION A - Core - Answer Any Three of the questions on this A3 sheet A-1. The 3D graphic below shows a helmet from a set of armour used by a local drama group. It consists of

two truncated cones. The drawing on the right shows the elevation of the top truncated cone. The true shape of the cut surface is a parabola.

(a) Use a focal sphere to find the directrix and the focal point of the parabola. (b) Draw a portion of the curve

A-2. The 3D graphic below shows a pair of

garden lights. The head of the light consists of two square-based truncated pyramids.

The drawing on the right shows a set of dimetrix axes. The elevation of a similar lamp head has been positioned relative to the axes as shown.

Draw the plan in its correct position and complete the axonometric projection.

A-4. The graphic below shows a miner in a borehole. The positions of two boreholes are represented

by the projections of two skew lines AB and CD as shown. To facilitate access between the boreholes a horizontal borehole is required.

(a) Determine the projections of the shortest horizontal distance between the two lines.

(b) Determine and indicate the length of this shortest distance.

This examination paper must be returned at the end of the Examination – You must include your Name, School Name and Teacher Name on the front cover

MARKING SCHEME Total (20) (a) Focal sphere (5m) Axis (2m) Directrix (3m) Focal point (2m) (b) Construction (5m) Curve (3m)

MARKING SCHEME Total (20) (a) Method (5) Point on cut surface

(4m) Completion (5m) (b) Method (3m) Angle (3m)

MARKING SCHEME Total (20) TS of HP (4m) Plan (2m) Projectors (4m) Base (3m) Top (3m) Completion (4m)

MARKING SCHEME Total (20) (a) Parallel plane (6m) Skew lines (4m) Shortest Distance (4m) (b) Method (3m) Altitude (3m)

2013 L.84/85_MS 13/20



Higher Level – Section (B)


MARKING SCHEME Total (45) (a) Set up (8m) (b) Method (7m) Line of intersection (7m) (c) Method (8m) Dihedral angle (7m) (d) Method (4m) Inclination (4m)

2013 L.84/85_MS 14/20





MARKING SCHEME Total (45) (a) Plan (8m) (b) S, PP, VPs (6m) GL, HL, VPs (4m) Projectors (4m) Base (6m) Underside (5m) RHS including set up (6m) AVP (3m) Completion (3m)

2013 L.84/85_MS 15/20





MARKING SCHEME Total (45) (a) AB (7m)

Apex (5m) Prism (5m) Pyramid (5m)

(b) Opening in plan (5m)

Opening in elevation (5m) (c) Method (5m) HT (4m) VT (4m)

2013 L.84/85_MS 16/20



Higher Level – Section (C)


MARKING SCHEME Total (45) (a) Earthworks A-B Parallel lines (10m) Intersections / curves (9m) Earthworks B-C Arc (5m) Parallel Lines (4m) Intersection / curves (7m) (b) Plot strike (3m) Dip (3m) Plot borehole (2m) Thickness (2m)

B CA

2013 L.84/85_MS 17/20





MARKING SCHEME Total (45) (a) Plan and elevation of ABCD (6m) Plan and elevation of elements (6m) Top curve (4m) Ellipse in plan (5m) Extension of elements (5m) Elevation of curve (5m) (b) Circle in plan (2m) Elevation of curve (6m) (c) HT (3m) VT (3m)

2013 L.84/85_MS 18/20





MARKING SCHEME Total (45) (a) Base cone (6m) Top cone (6m) Truncation (10m) (b) Development (8m) Rectangular sheet (4m) (c) Focal sphere (4m) DD (3m) Focus and vertex (4m)

2013 L.84/85_MS 19/20

Fig. C-4(a) Scale 5:1




L.85 Scale Question C-4

MARKING SCHEME Total (45) (a) Draw profile (5m) Displacement diagram (6m) Divisions (4m) Points (4m) Extra points (4m) Curve (4m) (b) Set up (6m) Method (8m) Curve (4m)

Fig. C-4(b) Scale 1:1

2013 L.84/85_MS 20/20





MARKING SCHEME Total (45) (a) End view outline (6m) Completion (6m) Sectional elevation outline (6m) Cut in side (6m) Dowels (7m) Centerlines (3m) Hatching (3m) (b) Part 1 (8m)

2013 l.84-85 ms -15 cm-final l.84/85_ms 12/20 the drawing on the right show (b) (b) (a) a-3. the 3d...

Documents