Drawing and Design Paper 1 Questions and Answers - KCSE 2022 Mock Exams Set 1

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INSTRUCTIONS TO CANDIDATES.

  • You should have the following for this examination:
    • Drawing instruments
    • 3 sheet of drawing paper size A3
  • This paper consists of THREE sections A, B and C.
  • Answer ALL the questions in section A and B and any TWO questions from section C.
  • Questions in section A must be answered on the answer sheets provided.
  • Questions in section B and C should be answered on the A3 drawing papers provided.
  • All dimensions are in millimeters unless otherwise stated.
  • Candidates may be penalized for not following the instructions given in this paper.

QUESTIONS

SECTION A (50 MARKS)
Answer All Questions In This Section

  1.                        
    1. Give the following information regarding parastatal organizations in Kenya with regard to; (3 marks)
      1. Ownership
      2. Management
      3. Services
  2.                  
    1. State one disadvantage of using each of the following items to hold paper on the drawing board. (2 marks)
      1. Masking tape
      2. Thumb pins
    2. Describe each of the manufactured boards; (3 marks)
      1. Ply wood.
      2. Chip board
      3. Block board.
  3.                      
    1. State three factors to consider when choosing materials for engineering works (3 marks)
    2. Explain the meaning of the term “alloy” as applied in materials and give two examples ( 2marks)
  4. State the importance of following steps in the design process. (3 marks)
    1. Evaluation:
    2. Final drawing:
    3. Mock-up
  5. Construct an ellipse using the rectangle method whose sides are 80mm by 45 mm. (5 marks)
  6. Construct a regular octagon inside a square whose sides are 80mm. ( 5 marks)
  7. Two views of a machine component are shown below in Figure 1. Sketch the block in oblique taking X-X as the lowest point (6 Marks)
    7 uyyauygda
  8. Draw an isometric circle whose diameter is 60mm using ordinate method. (4 marks)
  9. Front elevation of a pentagonal pyramid truncated by the cutting plane X_X is given in figure 2.
    Sketch the auxiliary view and a plan. (8 marks)
    9 agtfduyada
  10. Two views of a machine part are shown in figure 3. Sketch a two point perspective of the block. (8marks)
    10 asuygdad

Section B (20 Marks)
This is a compulsory question.

Students are advised not to spend more than 1 hour answering this question

  1. Figure 4 shows parts of a bearing bracket in third angle projection. Assemble the parts and draw FULL SIZE the following:
    1. Sectional front elevation along the cutting plane C-C
    2. End elevation in the direction of arrow D. Insert four leading dimensions.
      11 auytdada

Section C (30 Marks)
Answer any two questions from this section

  1. Figure 5 shows an isometric view of a machined block.
    12 auyytdad
    Draw FULLSIZE in third angle projection the three orthographic views of the block.
  2. Figure 6 shows the intersection of two pieces of pipe of equal diameter at 30º
    1. Copy the given views
    2. Complte the plan.
    3. Draw the surface development of the branch pipe labelled A. 
      13 aytfdad
      (15 marks)
  3.                          
    1. Define the term involute. (2 marks)
    2. Draw an involute to a circle of with a diameter of 30mm. (8 marks)
    3. Draw a tangent to any point T on the involute. (5 marks)

MARKING SCHEME

  1.                        
    1.                        
      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 cutomers who might find it expensive to afford them if they were left to private establishments
        (3 marks)
  2.                                  
    1.                         
      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
    2.                           
      1. Plywood are manufactured boards made of thin sheets of woods (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)
        (3 mks)
  3.                                  
    1.                          
      • Use of the item to be fabricated or manufactured
      • Availability of the material
      • Durability of the material
      • Cost of the material
      • Weather conditions like internal or external
      • Ease in the use of materials or workability
    2. Explain the meaning of the term “alloy” as applied in materials and give two examples ( 2marks)
      • Alloy is a metal made from two or more metals example bronze, brass, and aluminum
  4. State the importance of following steps in the design process. (3 marks)
    1. Evaluation: Testing to see if it has satisfied the need and if not to find out where or why it has failed
    2. Final drawing: used to manufacture the real object by the craftsman.
    3. Mock-up: use to test or find out whether or not the design is satisfactory. Imperfections not seen when drawing may show up in mock-up.
  5. Construct an ellipse using the rectangle method whose sides are 80mm by 45 mm. (5 marks)
    5 ddaada
  6. Construct a regular octagon inside a square whose sides are 80mm. ( 5 marks)
    6 adadada
  7. Two views of a machine component are shown below in Figure 1. Sketch the block in oblique taking X-X as the lowest point (6 Marks)
    7 sdadad
  8. Draw an isometric circle whose diameter is 60mm using ordinate method. (4 marks)
    8 adadad
  9. Front elevation of a pentagonal pyramid truncated by the cutting plane X_X is given in figure 2.
    Sketch the auxiliary view and a plan. (7 marks)
    9 adada
  10. Two views of a machine part are shown in figure 3. Sketch a two point perspective of the block. (7marks)
  11. Students are advised not to spend more than 1 hour answering this question
    11 vqeqeqe
  12.            
    12 aadada
  13.                              

    13 asdada
  14.                    
    1. Define the term involute. ( 2 marks)
    2. Draw an involute to a circle of with a diameter of 30mm. (8 marks)
    3. Draw a tangent to any point T on the involute. (5 marks)
      • Involute: Is a curve that is obtained by attaching a string which is imaginary and then winding and unwinding it tautly on the curve given
        14 adada

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