Drawing and Design Paper 1 Questions and Answers - Bunamfan Cluster Pre Mock Exam 2022

Instructions To Candidates

1. You should have the following materials for this examination.
   - Drawing instruments.
   - 3 sheets of drawing paper size A3
2. This paper consists of three sections A, B and C.
3. Answer ALL the questions in section A and B and any two questions from section C. d) Question in Section A must be answered on the answer sheets provided.
4. Question in section B and C should be answered on the A3 sheet of the drawing paper provided. f) All dimensions are in millimetres unless otherwise stated.

Questions

SECTION A (50 marks)
Answer ALL the questions in this section in the spaces provided.

1. Explain technical drawing as means of communication. (2 marks)
2.        
   1. Name three types of lines and specify the pencil grade to be used in each case. (3 marks) (i).
   2. State four computer Softwares used technical drawing. (2 marks)
3.    
   1. By use of neat diagram, show how an A0 drawing paper can be sub-divided to generate paper sizes A1, A2 and A3. (3 marks)
   2. State three factors to be considered while lettering. (3 marks) (i).
4. Use standard symbols and abbreviations to represent each of the following: (4 marks) i) Cylinder ii) Machined surface.
5. Construct a triangle ABC whose sides are in the ratio 3 : 4 : 6 given the length of 110mm and measure the smallest angle. (5 marks)
6. Construct a diagonal scale of 3 : 1 having an accuracy of 0.1mm to read to a maximum of 40mm. Show a reading of 28.3mm (6 marks)
7. Figure 1 shows the layout of a crank mechanism. Draw the locus of point C for one revolution of crank OB. End A of link AB moves along the horizontal centre line. (6 marks)
   
8. Using a ruler and pair of compasses only, construct a REGULAR HEPTAGON. Whose sides are 30mm long. (6 marks)
9. The FIGURE 2 below shows the Front Elevation of equilateral triangular pyramid drawn in Third angle orthographic projection.
   Draw the plan and End elevation in the direction of the arrow. (6 marks) Fig 2
   
10. Define the following properties of materials: - (4 marks) 
    1. Hardness
    2. Toughness
    3. Elasticity
    4. Plasticity.

SECTION B (20marks)
This question is compulsory.
Candidates are advised to spend no more than one hour on this question.

11. Figure 7 shows parts of a retort stand clamp drawn in first angle projection. Assemble the parts and draw FULL SIZE, the following views of the vice in third angle projection:
    
    1. A sectional front elevation along the cutting plane P - P
    2. End elevation in the direction of arrow X
    3. Plan
       Insert six leading dimensions and do not show hidden details.
       

SECTION C (30mar ks)

12.  Figure 8 shows the mouth of a cup having Ø45mm and a handle protruding 10 mm.
    
    If the cup is rolled on the surface AA for one complete revolution, construction the locus of point X on the handle. (15 marks)
13. The figure below shows the front elevation of truncated hexagonal pyramid along X-X. Draw the following views accurately in first angle orthographic projection: (15 Marks)
    1. The Complete plan.
    2. The end elevation in the direction shown by the arrow Z.
    3. The true shape of the section.
    4. The auxiliary view
       
14. Make an isometric drawing from the three views given in Fig 10 below taking point X as the lowest point. (15 Mark)
    

Marking Scheme

1. Explain technical drawing as means of communication. (3 marks)
   • is a discipline that is able to be understood world wide by those who have studied it. It is made
     possible due to the standardization of conventions, abbreviation and symbols.
   • NB: Technical drawing is a means of communication between engineers and / or designers and the
     production / manufacturing industries. 3 marks
2. Name three types of lines and specify the pencil grade to be used in each case. (3 marks)
   • Thick continuous - visible outlines B or HB
   • Medium Thin Cont - Dimensional or external outlines.
     - 2 H or H
   • Very thin cont. lines - construction or guide lines - 3H or 4H. 3 marks
3.   
   1. Illustrate how an AO drawing paper can be sub-divided to generate paper sizes A1, A2 and A3. (3 marks)
      
   2. Show dimensions of
      • A0 = 841 × 1189 = 841 × 1189
        A1 = 841/2 × 1189 = 841 × 594
        A2 = 841/2 × 594 = 420 × 594
        A3 = 594 × 420 = 297 × 420
4. Use standard symbols and abbreviations to represent each of the following:
   
5. Construct a triangle ABC with angles in the ratio 3 : 4 : 6 given the length of the base as 50mm. (6 marks)
   • Solution
     3 + 4 + 6 = 13
     Draw semi-circle and divide it into 13 parts
     Single-out the ratios 3 : 4 : 6 on the semi-circle.
     
6. Construct a diagonal scale of 2 : 1 having an accuracy of 0.1mm to read to a maximum of 40mm. Show a reading of 28.3mm (6 marks)
   • Solution
     Scale length
     = R.F × MAX. LENGTH
     = 2/1 × 40mm = 80mm
     
7. Locus of point C for one revolution of crank OB (6 marks)
   
8. Using a ruler and pair of compasses only, construct a REGULAR HEPTAGON. Whose sides are 30mm long. (6 marks)
   
9. (6 marks)
   
   TRUNCATED TRIANGULAR PYRAMID
10. Define the following properties of materials:-
    1. Hardness - when it can withstand scratching, wear or Abrasion, indentation by harder bodies. e.g. marking knife, files etc.
    2. Toughness - the ability of a material to withstand impact load or hammering load.
    3. Elasticity - Ability of a material to deform under load and return to its original shape or size when the load is removed. So long as it does not exceed its elastic limit.
    4. Plasticity - ability of a material to deform under load and retain its new shape when the load is removed. e.g. soft steel. (4 marks)
11. Figure 7 shows parts of a retort stand clamp drawn in first angle projection. Assemble the parts and draw FULL SIZE, the following views of the vice in third angle projection:     
    1. A sectional front elevation along the cutting plane P - P
    2. End elevation in the direction of arrow X
    3. Plan
       Insert three leading dimensions and do not show hidden details.
       
       

       PARTS NAME	MATL	NO. OFF
       E PIN	M.S	1
       D SCREW	M.S	1
       C LOWER JAW	M.S	1
       B UPPER JAW	M.S	1
       A SCREWED ROD	M.S	1
       SCALE	1:1	NAME

12. Figure 8 shows the mouth of a cup having Ø45mm and a handle protruding 10 mm.
    • If the cup is rolled on the surface AA for one complete revolution, construction the locus of point X on the handle. (15 marks)
      
13. Figure 9 shows a square pyramid transacted along X - X and Y - Y.
    • Copy the given front elevation, complete the plan and draw the end elevation in the direction of arrow U. (15 marks)
14. Make an isometric drawing from the two views given in FIGURE. (15 marks)