# Drawing And Design Paper 1 Questions and Answers - KCSE 2022 Past Papers

## QUESTIONS

SECTION A (50 marks)
Answer all the questions in this section in the spaces provided.

1.
1. Give two reasons for engineers to study technical drawing.
2. State four uses of computers in technical drawing.
2.
1.
1. State two methods of sharpening pencil leads.
2. Give the reason for rotating a pencil when drawing.
2. Sketch the symbols used for each of the following conventions in drawing
1. Splined shaft
3.
1. List four mechanical properties of metals (2 marks)
2. List four requirements necessary for starting a small business. (2 marks)
4. Define each of the following terms as used in the design process
1. Secondary objective
2. Realisation (2 marks)
5. Construct the involute of a square of side 30 mm. (5 marks)
6. Figure 1 shows a block drawn in isometric projection. Draw in good proportion the following views in third angle projection:
1. The front elevation
2. The plan
7. Figure 2 shows an elevation and an incomplete plan of a truncated rectangular pyramid drawn in first angle projection.
1. Copy the elevation.
2. Complete the plan.
8. Figure 3 shows three views of a shaped block drawn in first angle projection. Draw the block in isometric projection taking X as the lowest point.
9. Illustrate methods of dimensioning each of the following features:
1. Large res
2. Semi-circle
3. Small gaps
4. Slope (6 marks)
10. Figure 4 shows an exploded view of a joint. Assemble the parts and draw full size the three orthographic views of the joint, in third angle projection.

SECTION B (20 marks)
This question is compulsory.

It should be answered on the 43 paper provided
Candidates are advised to spend not more than 1 hour on this question

1. Figure 5 shows the parts of a stop cock drawn in first angle projection. Assemble the parts and draw Full Size the following
1. A sectional front elevation along the cutting plane Y-Y
2. The plan

SECTION C (30 marks)

Answer any two questions from this section on the A3 paper provided.

1. Figure 6 shows a cone truncated at the top and bottom. Copy the figure and draw the surface
2. Figure 7 shows the front view of a house. Construct a diagonal scale in which 20 mm represent
Im to read up to 5 m
Use the scale to draw the view of the house.

(15 marks)
3. Figure 8 shows three orthographic views of a block drawn in first angle orthographic projection.

Draw the isometric view of the block. Include hidden details.
(15 marks)

## MARKING SCHEME

1.
1. Solution
• Interpret engineering drawings
• Design projects
• Appreciate drawings
2. For draughting or design
• Reference/research
• Storage of drawings
• Editing drawings
• Sharing disseminating information
• Display/view
2.
1. Solutions
• Conical pointed
• Chisel
Any 4x2 marks
1. To maintain uniform intensity of the line
2.
3.
• Malleability
• Hardness
• Toughness
• Strength
• Brittleness
• Ductility
• Plasticity
• Elasticity
• Fusibility
1.
• Capital
• Premises
Accept any other correct requirement
4.
1. Secondary objective refers to the value addition to a designed ob ject e.g. comfort, aesthetics value e.t.c
2. Realization is the process making of a real object from the working drawing (Actualization of the design)

5. Square drawn with correct dimensions-1 mark
Tangents drawn from 4 sides-4x 1⁄2 marks
Smooth curve of the involute

6. Correct angle of projection-1 mark
Correct front elevation - 3 marks
Correct plan with hidden details-3 marks
Total - 7 marks

7. Elevation copied correctly. I mark
5 faces of plan with hatching- 3 marks
Total 4 marks

8. Correct isometric of projection-1 mark
5 faces drawn correctly -5 marks
Total = 6 marks
9.

10. Parts assembled correctly- 1marks
Correct angle of projection=1 mark
Correct front elvation with 2 faces-2x-1 mark
Correct end elevation with 2 face-2×1⁄2=1 mark
Correct plan with 3 faces-3x-1⁄2 marks
Total = 6 marks

11. Correct angle of projection-1 mark
Right scale used for drawing-1 mark
SECTION Y-Y
Correct assembly 4 marks
Correct knurling -1 mark
Correct hatching for 4 faces-4 x 1-4 marks
Correct representation of threads I mark
Hexagonal nut drawn correctly -2 marks
2 centerlines drawn correctly -- 2 x 1⁄2 = 1 mark PLAN
4 faces -4x=2 marks
2 centerlines-2-1 mark
Correct use of lines -2 marks</br<>

12. Copying the figure-1 mar Drawing the plan- 1 mark
Dividing the plan into 12 divisions-2 marks
Projecting from plan to elevation - I mark
Projecting from elevation base to the tip-1 mark
Projecting from top part of cut face to edge-1 mark
Projecting from bottom part of cut base to surface development - 1 mark
Plotting point on surface development -1 mark
Plotting bottom points on the development-2 marks
Complete development
Linework
Neatness

13. Length of scale I mark
1st divisions 1 mark
Accuracy = 1 mark
2nd divisions - I mark
Diagonal divisions 1 mark
Complete scale=1 mark
Transfer of 11 dimensions 11 1⁄2-5 1⁄2 marks
Completing figure -2 mark
Linework and neatness -1 1⁄2
Total 15 marks

14. Correct isometric projection-1 mark
7 faces -7 x 1-7 marks
3 isometric circles-31-3 marks
Hidden details included -1 mark
Correct position of base = 1 mark
Linework and neatness-2 marks
Total - 15 marks</br<>

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