KCSE 2012 Drawing and Design Paper 1 with Marking Scheme

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SECTION A (50 marks)

Answer all the questions in this section in the spaces provided.

  1.  
    1. Give the following information regarding parastatal organizations in Kenya with respect to:
      1. ownership;  (1 mark)
      2. management;  (1 mark)
      3. services;     (1 mark) 
    2. Describe four main steps involved in design process.   (4 marks)
  2.  
    1.  
      1. State one reason for using different types of lines in drawing.  (1 mark)
      2. Explain one use of each of the following lines:    (1 mark)
    2. Outline six advantages of using computers in drawing.   (3 marks)
  3.  
    1. State one disadvantage of using each of the following items to hold paper on the drawing board.
      1. masking tape; (1 mark)
      2. thumb pins.  (1 mark)
    2. Describe each of the following manufactured boards:
      1. plywood;  (1 mark)
      2. chip board;  (1 mark)
      3. blockboard.  (1 mark)
  4. Figure 1 shows a template drawn full size.
    KCSE 2012 DD PP1 Q4
    Measure and dimension the hole and angle of the slanting face.   (2 marks)
  5. Figure 2 shows a pictorial view of a block.
    KCSE 2012 DD PP1 Q5
     Using third angle projection, sketch in good proportion the orthographic views of the block.  (6 marks)
  6. Figure 3 shows two views of a block drawn in first angle projection. In good proportionality sketch the block in oblique projection.   (6 marks)
    KCSE 2012 DD PP1 Q6
  7. Construct an internal common tangent to the circles given in figure 4.   (7 marks)
    KCSE 2012 DD PP1 Q7    
  8. The following lines were drawn using different scales.
    1. A _______________________ B
    2. C _____________ D
      Determine the distance represented by each line using the given scale. (3 marks)
      1. Line AB if the scale used is 1:2
      2. Line CD if the scale used is 2:1.
  9. A right square pyramid is truncated along X-X and Y-Y as shown in figure 5.
    KCSE 2012 DD PP1 Q9
    Complete the plan.  (4 marks)
  10. Figure 6 shows two views of a shaped block drawn in first angle projection. Sketch the third view by projecting from the given views.    (5 marks)
    KCSE 2012 DD PP1 Q10

SECTION B (20 marks)
This question is compulsory.

  1. Figure 7 shows parts of a machined component drawn in first angle projection. Assemble the parts and draw the following:
    1. Sectional front elevation through the cutting plane F - F;
    2. the plan.     (20 marks)
      KCSE 2012 DD PP1 Q11

SECTION C (30 marks)

Answer any two questions from this section.

  1. Figure 8 shows the three orthographic views of a machined block drawn in first angle projection. Draw full size, the isometric view of the block taking corner X as the lowest point.  (15 marks)
    KCSE 2012 DD PP1 Q12
  2. In the mechanism shown in Figure 9, the crank EF rotates about centre E while GH oscillates about G.
    Plot the locus of point P for one complete revolution of EF (15 marks)
    KCSE 2012 DD PP1 Q13
  3. Figure 10 shows a branch pipe A connected to a conical shaped base of a chimney B.
    KCSE 2012 DD PP1 Q14
    Draw the curves of interpenetration between the pipe and the conical base in:  (15 marks)
    1. plan
    2. elevation


MARKING SCHEME

  1.  
    1.  Information regarding parastatal organizations in Kenya:
      1. Ownership - They are largely owned by the government.
      2. Management - They are managed by government appointees.
      3. Services - They provide subsidized services to the customers who might find it expensive to afford them if they were left to private establishments.
        (3x1 = 3 marks)
    2. Steps involved in the design process:
      1. Statement/stating the problem.
      2. Recording the design ideas in form of sketches and written notes.
      3. Selecting the best solution.
      4. Preparing the final drawing or mock-up (model).
        (4x1 = 4 marks)
  2.  
    1.  
      1. Reasons for using different types of lines in drawing:
        • It makes the drawings neat and legible.
        • It makes it easy for the person/people depending on the drawing to interpret the details in the drawing.   (1x1 = 1 mark)
      2. Use of the following lines:
        • _______________________centre line denoting:-
                                                    -centre of a circle
                                                    -axis of symmetry
        • ___________________________phatom to denote:
                                                         - folding line
                                                         - different possible positions
           (2 x ½ = 1 mark)
    2. Advantages of using computers in drawing:
      1. There is higher speed in production of drawings thus saving time.
      2. There is high degree of accuracy.
      3. It is easy to retrieve information.
      4. It is easier to make alterations on the drawings.
      5. It allows for interfacing/interlinking.
      6. It allows for production of many copies.
      7. The drawings produced are neat.
        (Any 6x½ = 3 marks)
  3.  
    1. Disadvantages of using:
      1. Masking tape to hold paper
        • it tends to peel off part of the paper
      2. Thumb pins to hold paper
        • they ruin the surface of the drawing board
          (2x1 = 2 marks)
    2.  
      1. Plywood are manufactured boards made of thin sheets of wood (veneers) that are glued together with the grain of each layer perpendicular to the next.
      2. Chipboard is manufactured by chips of wood which are compressed and glued to the required density.
      3. Blockboards are made up of blocks of timber joined on edge and faced suitably with plywood on both faces.
        Sketches to be accepted.     (3x1 = 3 marks)
  4.  
    KCSE 2012 DD PP1 Ans 4
  5.  
    KCSE 2012 DD PP1 Ans 5
  6.  
    KCSE 2012 DD PP1 Ans 6
  7.  ,
    KCSE 2012 DD PP1 Ans 7
  8. AB = measured dimension x 2      60 × 2 = 120mm 1½
    CD = measured dimension x ½     34 × ½ = 17mm  1½    3 marks
    OR
    Correct measurements of AB and CD     (2 x ½ =1mark)
    Determining the distances                    (2 x 1 = 2 marks)
                                                                       3 marks
  9.  
    KCSE 2012 DD PP1 Ans 9
  10.  
    KCSE 2012 DD PP1 Ans 10
  11.  Section FF
    16 Faces @ ¼ = 4 marks
    hatching 6 x 1 = 6 marks
    Plan
    13 faces @ ½ = 6½
    4 holes @ ½ = 2
    linework = 1½                  20 marks
    KCSE 2012 DD PP1 Ans 11
  12.  
    KCSE 2012 DD PP1 Ans 12
    faces 7 x 1 = 7
    isometric axis = 1
    low pitch X =1 
    pictorial curve = 2
    conical hole (8) = 2
    scale = 1
    linework = 1
                  (15 marks)
  13.  
    KCSE 2012 DD PP1 Ans 13
  14.  
    KCSE 2012 DD PP1 Ans 14
    drawn elevation = 1
    drawn plan = 2
    divide pipe in elevation = 1
    plot points at intersection of sloping edges = 1
    project elevation points to plan = 1
    draw circles at intersection of plan points and elevation points = 1
    mark curve of interpenetration points of plan = 2
    mark points of interpenetration on elevation = 2
    draw smooth curve through points of plan; part full lines; part hidden details = 1
    draw smooth curve through points of elevation=1
    construct lines = 1
    outlines = 1                                     (15 marks)

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