Drawing and Design Questions and Answers - Form 2 End Term 3 Exams 2023

Instructions to candidates

• You should have the following for this examinations:
  • Drawing instruments;;
  • Scale rule.
• Answer ALL the questions in sections

1.  
   1. Explain why the second angle of projection is not used in orthographic drawing. (2mks)
   2. Name and state the uses of each of the following lines. (2mks)
      1.  
         
      2.  
         
2.  
   1. State 2 disadvantages of using tape to hold paper on drawing board. (2mks)
   2. State any two methods of communicating design. (2mks)
3. State four factors to be considered when lettering (4mks)
4. Construct a regular octagon which is circumscribed by a circle whose diameter is 60mm. (5mks)
5. Construct a diagonal scale in which 3cm represent 4cm long enough to measure up to 20cm. (6mks)
6. Construct an ellipse within a rectangle measuring 70mm by 50mm. (6mks)
7. Sketch the missing front elevation . (4mks)
   
8. The sides f a triangle ABC and AB=90mm BC=65mm and AC=75mm and construct a square with equal area. (10mks)
9. Produce an isometric projection form the three views given below. (15mks)
   
10. In the mechanism shown below, the crank OB rotates about centre O. Rod AC is pin-jointed to the crank at B. Rod AB is free to slide through point C. DE 30mm long is always perpendicular to the AB. Draw the locus of the end E as OB makes one complete revolution. (15mks)
    
11. From the isometric block shown below Draw in 3rd angle projection the following views.(15mks)
    1. Front elevation in direction of arrow X
    2. End elevation in direction of arrow Y
    3. The plan
       
12. Draw the views given below in one point perspective. (12marks)
    
    
    

MARKING SCHEME

1.  
   1. Explain why the second angle of projection is not used in orthographic drawing. (2mks)
      • It will not add value to the drawing since it will produce the same view as one initially used through in reverse direction.
   2. Name and state the uses of each of the following lines. (2mks)
      1. Centerline /dimensions of circle
      2. Hidden details –show parts hidden from view.
2.  
   1. State 2 disadvantages of using tape to hold paper on drawing board. (2mks)
      • Peels the paper
      • Makes the paper Dirty /Expensive/wasteful
   2. State any two methods of communicating design . (2mks)
      • Sketches, Pictures, Models, Photos, Etc
3. State four factors to be considered when lettering (4mks)
   • Uniformity
   • proportional 2 equal spacing of letters and numerical
   • uniform , strength of letters
   • ascending and descending of uppercase and lowercase.
4. Construct a regular octagon, which is circumscribed by a circle whose diameter is 60mm. (5mks)
   x
5. Construct a diagonal scale in which 3cm represent 4cm long enough to measure up to 20cm. (6mks)
   
6. Construct an ellipse within a rectangle measuring 70mm by 50mm. (6mks)
   
7. Sketch the missing front elevation . (4mks)
   
8. The sides f a triangle ABC and AB=90mm BC=65mm and AC=75mm and construct a square with equal area. (10mks)
   
9. Produce an isometric projection form the three views given below. (15mks)
   
10. In the mechanism shown below, the crank OB rotates about centre O. Rod AC is pin-jointed to the crank at B. Rod AB is free to slide through point C. DE 30mm long is always perpendicular to the AB. Draw the locus of the end E as OB makes one complete revolution. (15mks)
    
11. From the isometric block shown below Draw in 3rd angle projection the following views. (15mks)
    1. Front elevation in direction of arrow X
    2. End elevation in direction of arrow Y
    3. The plan
       
       FE
       CORRECT FACE ...............4
       PLAN
       4 FACES..............................4
       HIDDEN DETAILS ...............1
       END ELEVATION
       2 FACES...............................2
       HIDDEN DETAILS................2
       GENERAL
       CORRECT PROJECTIONS..1
       LINEWORK...........................1
12. Draw the views given below in one point perspective.