KCSE 2012 Drawing and Design Paper 1 with Marking Scheme

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KCSE 2012 Drawing and Design Paper 2 with Marking Scheme

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SECTION A (50 marks)

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

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)
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)
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)
Figure 1 shows a template drawn full size.

Measure and dimension the hole and angle of the slanting face. (2 marks)
Figure 2 shows a pictorial view of a block.

Using third angle projection, sketch in good proportion the orthographic views of the block. (6 marks)
Figure 3 shows two views of a block drawn in first angle projection. In good proportionality sketch the block in oblique projection. (6 marks)
Construct an internal common tangent to the circles given in figure 4. (7 marks)
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.
A right square pyramid is truncated along X-X and Y-Y as shown in figure 5.

Complete the plan. (4 marks)
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)

SECTION B (20 marks)
This question is compulsory.

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)

SECTION C (30 marks)

Answer any two questions from this section.

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)
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)
Figure 10 shows a branch pipe A connected to a conical shaped base of a chimney B.

Draw the curves of interpenetration between the pipe and the conical base in: (15 marks)
1. plan
2. elevation

MARKING SCHEME

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)
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)
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)
,
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
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
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)
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)