Drawing and Design Paper 1 Questions and Answers - Form 3 End Term 3 Exams

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Instructions to candidates

You should have the following for this examinations:
Drawing instruments;
4 sheets of drawing paper size A3;
Scale rule.
This paper consists of three sections: A, B and C.
Answer ALL the questions in sections A and B.
Answer any TWO questions in section C
Answer ALL questions in the A3 papers provided.

1. 1. Outline two methods of mounting drawing paper on a drawing board surface. (2mks)
  2. Give two reasons for including notes on a drawing. (2mks)
2. State one reason why each of the following factors should be considered during design process. (3mks)
  1. Moral value
  2. Environmental factor
  3. Economic factors
Give two reasons for using
1. Plastic in making set-squares (1mk)
2. Blackboard in making drawing board. (1mk)
3. Soft board in encasing pencil lead (1mk)
Illustrate using sketch how to dimension
1. Hypotenuse in a right angle triangle (2mks)
2. An arc in a circle (2mks)
Define the following properties of materials. (4mks)
1. Plasticity
2. Toughness in design materials
3. Shear strength
4. Fusibility
Construct an ellipse whose minor diameter and major diameter are 50mm and 70mm respectively and show the two foci (5mks)
Front view of a tilted hexagonal pyramid is given below (5mks)
Sketch in good proportional the plan and end elevation of the pyramid
Construct a diagonal scale of 50mm: 1mm long enough to measure up to 3mm indicate a distance of mm. (5mks)
Indicate distances of 2.73mm and 1.26mm
Draw a regular pentagon whose length of sides are 25mm and convert to a square of an equal area. (6mks)
Sketch a sectional elevation along the cutting plane A-A (5mks)
Sketch the block in oblique cabinet projection ( 6 marks)

SECTION B (20 MARKS)
This question is compulsory
Answer this question on the A 3 paper provided
Figure below shows details of a hand vice. Assemble the parts and draw Full size the following views.
1. Sectional elevation along X-X
2. The plan
3. End Elevation in the direction of arrow A
  
  SECTION C (30 Marks)
  Answer any two questions from this section on the A3 drawing paper provided
Draw the views given below in isometric projection (15 marks)
A 60mm diameter cylinder has a string wound round it to form a helix with a lead of 70 mm. Draw helix in clockwise direction (15 marks)
Draw a cylinder whose diameter is 50mm and its height 60mm in two point perspective using plan projection method (15 marks)

MARKING SCHEME

Section A

1. 1. Outline two methods of mounting drawing paper on a drawing board surface. (2mks)
    - Magnetic strip
    - Clips
    - Tapes
    - Pins
    - Plasticine (Any two 2mks)
  2. Give two reasons for including notes on a drawing. (2mks)
    - To alert the reader from any changes from what is expected
    - To give reader further guidance or assistance so as to achieve expected solution.
2. State one reason why each of the following factors should be considered during design (3mks)
  1. Moral value – Acceptability /culture/religion
  2. Environmental value – pollution, conservation
  3. Economic – cost affordability and marketability
Give two reasons for using
1. Plastic in making set-squares (1mk)
  - Flexibility, Transparent, light and easy to clean
2. Blackboard in making drawing board. (1mk)
  - Flat, large surface area, strong
3. Soft board in encasing pencil lead (1mk)
  - Light, easy to sharpen, easy to handle
Illustrate using sketch how to dimension (2mks)
1. Hypotenuse in a right angle triangle
2. An arc in a circle (2mks)
Define the term as used in design materials. (4mks)
1. Plasticity
  - Ability of material to deform under load and retain its new shape when load is removed
2. Toughness in design materials
  - Ability of a material to withstand impact load/hammering.
3. Sheer strength
  - Ability of a material to withstand offset loads.
4. Fusibility
  - Ability of a material to become liquid when heated
Construct an ellipse whose minor diameter and major diameter are 50mm and 70mm respectively and show the two foci . (5mks)
Front view of a tilted hexagonal pyramid is given below (5mks)
Sketch in good proportional the plan and end elevation of the pyramid
Construct a diagonal scale of 50mm: 1mm long enough to measure up to 3mm indicate a distance of mm. (5mks)
Indicate distances of 2.73mm and 1.26mm
Length of scale = 3 x 50mm = 150mm
First division 3 x 50 mm lengths
Second division 10 x 0.1mm lengths
Diagonal division 10 x 0.01mm lengths
Draw a regular pentagon whose length of sides are 25mm and convert to a square of equal area. (6mks)
Draw a sectional elevation along the cutting plane A-A (5 Marks)
Sketch the block in oblique cabinet projection ( 6 marks)

SECTION B (20 MARKS)
This question is compulsory
Answer this question on the A 3 paper provided
Figure below shows details of a hand vice. Assemble the parts and draw Full size the following views.
1. Sectional elevation along X-X
2. The plan
3. End Elevation in the direction of arrow A
  
  SECTION C (30 Marks)
  Answer any two question from this section on the A 3 drawing paper provided
Draw the views given below in isometric projection (15 marks)
A 60mm diameter cylinder has a string wound round it to form a helix with a lead of 70 mm.
Draw helix in clockwise direction (15 marks)
Draw a cylinder whose diameter is 50mm and its height 60mm in two point perspective using plan projection method ( 15 marks)