Drawing and Design Paper 1 Questions - Bunamfan Post Mock 2021 Exams

Instructions to Candidates

• You should have the following for this examination
  • Drawing instruments
  • Drawing paper size A3
• This paper consists of three sections A, B and C
• Answer All the questions in sections A and B and any TWO questions from section C.
• All dimensions are in milimetres unless otherwise stated.

ANSWER ALL QUESTIONS IN SECTION A

1.  
   1. Explain briefly why models are necessary on a design solution (1mark)
   2. State two types of engineering materials against each category below   (3marks)
      1. ferrous metal
      2. non-ferrous metal
      3. plastics 
2.  
   1. State any three rules which govern dimensioning of engineering drawings. (3marks)  
   2. Label the engineering figure given below A-F   (3marks)
      
3. Sketch and state the use of the following machined screws applied in machine drawing.
   1. Cheese head screw
   2. Socket head screws
   3. Self-tapping screws
4. Draw a parabola inside a rectangle given below. (4marks)
   
5. Construct  a diagonal scale 50mm to 1m, 3m long to read to 0.1m. Use the scale to draw a triangle ABC. AB=1m,30mm CB=1m, 75mm  (5marks)
6. Construct a square equal in area to a given trianlge ABC. AB=75mm, AC=62°, and CAB=75°
7. State the purpose of each of the following drawing given below (3marks)
   1. Assembly drawing
   2. Exploded drawing
   3. Working drawing
8. Drawing an involutes of a hexagn whose nsides are 20mm. (4marks)
9.  A hexagonal pyramid of base side 30mm and axis length 60mm is resting on horizontal plane(HP) on one of its base corners with its axis inclined at 30°  to horizontal plane (HP). Copy the elevation given and project the plan. (3marks)
   
10. Use neat sketches to show the effect of carbon on plain steel in (3marks)
    1. Hardness
    2. Ductility
    3. Tensile strength

SECTION B (30MARKS)

This question is compulsory candidates are advised to spend not more than one hour on this question.

11. The figure EX 22.5 shows details of the bearing bracket and pulley. Assemble the parts and draw full size of the following views in third angle.
    1. A sectional End elevation along the cutting plane X-X
    2. Front elevation in the direction of arrow A
    3. Prepare the list part of the materials assembled.
       

SECTION C(30 marks) 
Answer any two questions from this section

12. Figure 7 shows the three views of a machined blcok drawn in first angle projection. Draw, FULL SIZE, the block in isometric projection taking corner "Y" as the lowest point. (15 marks)
    
13. Figure 4 shows  an isometric drawing of a castor wheel. Draw full size the following view in first angle orthographic projection (15 marks)
    1. Front elevation viewed in the direction of arrow A.
    2. End elevation in the direction of arrow B
    3. Plan
       
14. The figure below shows a junction of three intersecting equal pipes and off-set joint. Copy the diagram and draw the development of the mid-pipe A.   (15 marks)