DRAWING AND DESIGN PAPER 1 - 2019 LAINAKU JOINT EVALUATION EXAMINATION

SECTION A (50MARKS)
Answer all questions in this section.

1. 1. Give one reason why aluminum is used for overhead transmission of power.     (1mark)
   2. State the meaning of the following terms used in engineering (2marks)
      1. Toughness
      2. Tensile strength
2. 1. State two advantages of using drawing as means of communication.                   (2marks)
   2. State two functions of a design office in an engineering firm.                                       (2marks)
3. 1. State two roles of the National industrial training authority (NITA)                         (2marks)
   2. State in full the following abbreviations (2marks)
      1. TIVET
      2. MOEST
4. State four advantages of using computer in a drawing office                                     (4marks)
5. Construct a diagonal scale of 1: 5 to measure to an accuracy of 5mm up to 800mm. Show a   reading of 615 on the scale.               (6marks)
6. Using neat free hand sketches show the orthographic views of the figure 1 below in third angle.              (4marks)
   
   
7. you are given the diameter of a regular pentagon as 70mm. Construct the pentagon and state the length of one side.                          (6marks)
8. Sketch the convention for each of the following                                          (4marks)
   1. Circular tube
   2. Planed timber
   3. Diamond knurling 
   4. External thread
9. Two circles are given in figure 2 below, construct an internal tangent common to the two circles.     
                                                                                                          (8marks)
10. A pentagon is given in figure 3 below, using the ratio method. Draw an enlarged image of the pentagon in the ratio 5:3                                      (7mark) 
    
    
    SECTION B (20MARKS)
    This section comprises one compulsory question. Candidates are advised to spend not more than one hour in this section.                            
11. Figure 4 shows parts of a swivel assembly drawn in first angle projection. Assemble the parts and draw, FULL SIZE, the following views in first angle projection;
    1. Sectional front elevation along cutting plane P-P
    2. An end elevation.
       Insert six leading dimensions and do not show hidden details.
       
       
       SECTION C (30 MARKS)
       Answer any TWO questions in this section.
12. A cylinder has 30mm diameter and a piece of string equal in length to the circumference is attached to a point on the cylinder.
    1. Draw the path of the free end of the string if it is wound round the cylinder keeping it tight.     
    2. Name the resulting curve. (1mark)
    3. Construct the tangent to the curve (3marks)
13. Figure 5 shows an elevation and an incomplete plan of a square pyramid truncated along   R – R and Q – Q..
    
    
    1. Copy the given views and complete the plan. (9marks)
    2. Draw the end elevation in the direction of arrow U (7marks)
14. Draw a pentagon side 35mm. then construct in the same figure;                    (5marks)
    1. A triangle equal in area to the pentagon (3marks)
    2. A rectangle equal in area to the triangle and the pentagon (3marks)
    3. A square equal in area to the rectangle, triangle and pentagon (4marks)

MARKING SCHEME

SECTION A(50MARKS)
Answer all questions in this section.

1. 1. Give one reason why aluminum is used for overhead transmission of power.   (1mark)
      - It does not rust.
   2. State the meaning of the following terms used in engineering (2marks)
      1. Toughness
         The ability of a metal to resist deformation or impact load
      2. Tensile strength
         The ability of a metal to resist stretching force
2. 1. State two advantages of using drawing as means of communication. (2marks)
      Great amount of information can be exchanged faster and easier than words.
      it is a universaly understood language
   2. State two functions of a design office in an engineering firm.2marks)
      Production and reproduction of drawing
      Preparation of virtual models
3. 1. State two roles of the National industrial training authority (NITA)(2marks)
      Regulation of industrial training
      Administration of training levy fund
      Trade testing                                                          Anytwo2x1=2marks)
   2. State in full the following abbreviations  (2marks)
      1. TIVET
         Technical industrial vocational and entrepreneurship training
      2. MOEST
         Ministry of education ,science and technology
4. State four advantages of using computer in adrawing office (4marks)
   Computers are faster
   Computer drawings are easier to edit or modify
   Computers have a large storage
   Drawings can be shared in a wide audience             award1x4=4marks
5. Construct a diagonal scale of 1:5 to measure to an accuracy of 5mm upto 800mm.
   Show a reading of 615mm.
   R.F 1/5
   Scale length 1/5x800=160mm
   accuracy 5mm
    
   Main scale 1mark
   Division of main scale 1mark
   Accuracy scale 1mark
   Horizontal divisions 1mark
   Correct   reading   1mark total6marks 
6. Using neat freehand sketches show the orthographic views of the block below in third angle.(4marks)
   
    Correct front elevation     2marks
   correct plan1mark
   Hidden detail in the end elevation   1mark                         Total 4marks
7. You are given the diameter of a regular pentagon as 70mm .Construct the pentagon and state length of one side(6marks)
   
   Draw circle -                                                                               1mk
   Divide diameter into five equal parts-             1mk
   Construct arcs radius equal to diameter .   1mk
   Determine point B -                                                         1mk
   complete pentagon 1mk
   length of one side =41mm                                                  1mk                
   total 6marks
8. Sketch the convention for each of the following                                                               (4marks)
   
9. Two circles are given in figure2 below, construct an internal tangent common to the two circles.
   
   Layout                                              2marks
   Bisect c/c distance                1mark
   Construct semicircle        1mark
   Construct R+r arc                  1mark
   Construct tangent                2marks
   Neatness and linework 1mark
10. A pentagon is given in figure3 below ,using the ratio method .Draw an enlarged  image of the pentagon in the ratio 5:3(7mark) 
    
    Bisect BG to get point X ½mark -Drop perpendicular at A   1mark -construct arc BG centerX   ½mark
    complete pentagon AB’C’D’E’2marks
    Divide AF into three parts 1mark
    Plot point G   1 mark
    Complete arc BF [1mark 
    
    SECTION B (20MARKS)

11. SECTIONAL   FRONt
    Correct   assembl y 2½ mks
    Nut construction 3mar
    Correct hatching 7x½ =3½ mks
    Unhatched parts   2x1 =2mks

    correct end elevation 9 faces x   ½ =4½ mks
    
    TOTAL20MARKS
    
    SECTIONC(30MARKS)
    
12. Answer any TWO questions in this section.
    Draw circle 1mark                                 - complete locus 5marks
    Divide circle   2marks                       - complete tangent to the involute 5marks
    Draw tangents 3 marks
    
    
13. Correct front elevation         2marks
    projecting to end elevation   2marks
    Correct plan                           5 marks
    Hatching                               1 mark    
    line work and neatness       1 mark
    
    
14. Drawing a pentagon side 35mm - (5marks)
    A triangle equal in area to the pentagon - (3marks)
    A rectangle equal in area to the triangle and thpentagon                                   - (3marks)
    A square equal in area to the rectangle,triangle and pentagon   - (4marks)
    Follow through with construction