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
      2. Internal screw thread
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

11. 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.

12. Figure 6 shows a cone truncated at the top and bottom. Copy the figure and draw the surface
    
13. 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)
14. 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
      1. • Conical pointed
         • Chisel
           Any 4x2 marks
      2. To maintain uniform intensity of the line
   2.   
      
3.  
   1. • Malleability
      • Hardness
      • Toughness
      • Strength
      • Brittleness
      • Ductility
      • Plasticity
      • Elasticity
      • Fusibility
   2.  
      • License
      • Capital
      • Premises
      • Business plan
        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<>