Exam Year:2014

BUILDING CONSRUCTION I AND DRAWING
Oct./Nov. 2014
Time:3 Hours
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THE KENYA NATIONAL EXAMINATION COUNCIL
CRAFT CERTIFICATE IN BUILDING TECHNOLOGY
MODULE I
BUILDING CONSTRUCTION AND DRAWING
3 Hours
INSTRUCTIONS TO CANDIDATES
Write your name and index number in the space provided above.
Sign and write the date of the examination in the space provided above.
You should have the following for the examination
Scientific calculator/mathematical tables;and drawing instruments.
Answer a total of five questions as shown below in the space provided in this question paper:
Any two questions from section A
Any two question from section B
Any other one question from either section A OR B
All questions carry equal marks
Candidates should answer the questions in English.
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This paper consists of 20 printed pages.
SECTION A: BUILDING CONSTRUCTION I
Answer any two question from this section in the space provided.
1. (a) (i) Differentiate between the following terms as used in construction:
I. Environnmemt
II. Built environment.
(ii) State three environmental and three physical considerations before starting a construction project.
(8 marks)
(b)With the aid of labelled sketches explain the following types of foundation:
i. Deep strip foundation;
ii. Raft foundation.
(8marks)
(c) Explain the following methods for dewatering foundation trenches
i. Well point system ;
ii. Elecrto- osmosis
(4marks)
2. (a) (i) Explain the following functional requirements of a wall:
I. Strength and stability;
II. Durability
(ii) State four factors to be considered when designing a wall.
(6 marks)
(b) Outline two functions of a pier in wall construction.
(2 marks)
(c) With the aid of labelled sketches illustrate the construction of the following alternate courses of a brick wall.
-1.5 brick thick wall in flemish bond;
-1 brick thick wall in English bond
(12 marks)
3. (a) State two purposes of each of the following in solid ground floor construction giving two examples of materials for each case:
i. Hard core
ii. Damp proof membrane.
(4 marks)
(b) With the aid of a labelled sketch explain the construction of a suspended timber floor
(7 marks)
(c)(i) List four factors affecting the choice of floor.
(ii)Outline the procedure of laying an oversite concrete floor slab
(9 marks)

4. (a) With the aid of a labelled sketch explain the method of bridging openings by use of an arch. (8 marks)
(b)Compare and contrast between stone masonry and brick masonry
(6 marks)
(c) Outline six ways of preparing a surface for plastering
(6 marks)
SECTION B:DRAWING
Answer at least two questions from this section in the spaces provided.
5. (a)Explain how to take proper care for the following drawing instruments:
i. T- square;
ii. Compass.
(4 marks)
(b) Construct a plain scale 30mm equal 10mm,40mm long to read 2mm.Show readings of 24mm on the scale.
(5 marks)
(c) Draw the following types of lines used in drawing:
i. Centre line;
ii. Hidden details
iii. Outline;
iv. Long break line
v. Short break line
vi. Projection lines.
(3marks)
(d) (i) Construct a hexagonal polygon given that the distance across flats is 60 mm.
(ii) Construct a tangent to circle from a point F, 80 mm from the centre of the circle . The diameter of the circle is from the centre of the circle . The diameter of the circle is 40 mm.
(8 marks)

6. Figure 2 shows a pictorial view in isometric projection of a block. Draw the block in first angle orthographic projection viewing from direction X.
(20 marks)

7. (a) Figure 3 shows the orthographic views of a block. Draw a pictorial view of the block in oblique cabinet projection.

(b) Figure 4 shows the views of a block in third angle orthographic projection. Draw the pictorial view of the block in isometric projection.
(15marks)

8. Figure 5 shows the plan of a classroom to be constructed on a fairly level ground

To a scale of 1:20 draw sectional B-B showing the substructure upto D.P.C level given the following information:
-225 mm thick stone wall
-strip foundation 675 mm wide and 225 mm thich
-Depth of foundation below the ground level 1000 mm
-300 mm thick hard core.
-150 mm thick concrete floor slab.
-50 mm blinding layer.
-Assume any other relevant information.
(20 marks)