INSTRUCTIONS TO CANDIDATES.
- You should have the following for this examination:
- Drawing instruments
- 3 sheet of drawing paper size A3
- This paper consists of THREE sections A, B and C.
- Answer ALL the questions in section A and B and any TWO questions from section C.
- Questions in section A must be answered on the answer sheets provided.
- Questions in section B and C should be answered on the A3 drawing papers provided.
- All dimensions are in millimeters unless otherwise stated.
- Candidates may be penalized for not following the instructions given in this paper.
QUESTIONS
SECTION A (50 MARKS)
Answer All Questions In This Section
-
- Give the following information regarding parastatal organizations in Kenya with regard to; (3 marks)
- Ownership
- Management
- Services
- Give the following information regarding parastatal organizations in Kenya with regard to; (3 marks)
-
- State one disadvantage of using each of the following items to hold paper on the drawing board. (2 marks)
- Masking tape
- Thumb pins
- Describe each of the manufactured boards; (3 marks)
- Ply wood.
- Chip board
- Block board.
- State one disadvantage of using each of the following items to hold paper on the drawing board. (2 marks)
-
- State three factors to consider when choosing materials for engineering works (3 marks)
- Explain the meaning of the term “alloy” as applied in materials and give two examples ( 2marks)
- State the importance of following steps in the design process. (3 marks)
- Evaluation:
- Final drawing:
- Mock-up
- Construct an ellipse using the rectangle method whose sides are 80mm by 45 mm. (5 marks)
- Construct a regular octagon inside a square whose sides are 80mm. ( 5 marks)
- Two views of a machine component are shown below in Figure 1. Sketch the block in oblique taking X-X as the lowest point (6 Marks)
- Draw an isometric circle whose diameter is 60mm using ordinate method. (4 marks)
- Front elevation of a pentagonal pyramid truncated by the cutting plane X_X is given in figure 2.
Sketch the auxiliary view and a plan. (8 marks) - Two views of a machine part are shown in figure 3. Sketch a two point perspective of the block. (8marks)
Section B (20 Marks)
This is a compulsory question.
Students are advised not to spend more than 1 hour answering this question
- Figure 4 shows parts of a bearing bracket in third angle projection. Assemble the parts and draw FULL SIZE the following:
- Sectional front elevation along the cutting plane C-C
- End elevation in the direction of arrow D. Insert four leading dimensions.
Section C (30 Marks)
Answer any two questions from this section
- Figure 5 shows an isometric view of a machined block.
Draw FULLSIZE in third angle projection the three orthographic views of the block. - Figure 6 shows the intersection of two pieces of pipe of equal diameter at 30º
- Copy the given views
- Complte the plan.
- Draw the surface development of the branch pipe labelled A.
(15 marks)
-
- Define the term involute. (2 marks)
- Draw an involute to a circle of with a diameter of 30mm. (8 marks)
- Draw a tangent to any point T on the involute. (5 marks)
MARKING SCHEME
-
-
- Ownership
They are largely owned by the government - Management
They are managed by government appointees - Services
They provide subsidized services to the cutomers who might find it expensive to afford them if they were left to private establishments
(3 marks)
- Ownership
-
-
-
- Masking tape to hold paper
it tends to peel off part of the paper - Thumb pins to hold paper
they ruin the surface of the drawing board
- Masking tape to hold paper
-
- Plywood are manufactured boards made of thin sheets of woods (veneers) that are glued together with the grain of each layer perpendicular to the next.
- Chipboard is manufactured by chips of wood which are compressed and glued to the required density.
- Blockboards are made up of blocks of timber joined on edge and faced suitably with plywood on both faces.
Sketches to be accepted)
(3 mks)
-
-
-
- Use of the item to be fabricated or manufactured
- Availability of the material
- Durability of the material
- Cost of the material
- Weather conditions like internal or external
- Ease in the use of materials or workability
- Explain the meaning of the term “alloy” as applied in materials and give two examples ( 2marks)
- Alloy is a metal made from two or more metals example bronze, brass, and aluminum
-
- State the importance of following steps in the design process. (3 marks)
- Evaluation: Testing to see if it has satisfied the need and if not to find out where or why it has failed
- Final drawing: used to manufacture the real object by the craftsman.
- Mock-up: use to test or find out whether or not the design is satisfactory. Imperfections not seen when drawing may show up in mock-up.
- Construct an ellipse using the rectangle method whose sides are 80mm by 45 mm. (5 marks)
- Construct a regular octagon inside a square whose sides are 80mm. ( 5 marks)
- Two views of a machine component are shown below in Figure 1. Sketch the block in oblique taking X-X as the lowest point (6 Marks)
- Draw an isometric circle whose diameter is 60mm using ordinate method. (4 marks)
- Front elevation of a pentagonal pyramid truncated by the cutting plane X_X is given in figure 2.
Sketch the auxiliary view and a plan. (7 marks) - Two views of a machine part are shown in figure 3. Sketch a two point perspective of the block. (7marks)
- Students are advised not to spend more than 1 hour answering this question
-
-
-
- Define the term involute. ( 2 marks)
- Draw an involute to a circle of with a diameter of 30mm. (8 marks)
- Draw a tangent to any point T on the involute. (5 marks)
- Involute: Is a curve that is obtained by attaching a string which is imaginary and then winding and unwinding it tautly on the curve given
- Involute: Is a curve that is obtained by attaching a string which is imaginary and then winding and unwinding it tautly on the curve given
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