2011 Basic Design And Technology (Pre Technical Skills ) – Paper Two

1. (a) State three characteristics of a good plain seam.
Firm stitched and strong
Well neatened
Suitable for the fabric.

(b) State three causes of food spoilage.
Enzyme action
Moulds activity
Yeasts activity
Bacteria activity
Insect infestation

(c) Complete the table below by filling in the blank spaces

(d) The headmaster of your school has asked you to design and construct a Kumasi Ventilated Improved Pit (KVIP) toilet for the school

(i) List three building materials you will use for making the structure
• Sand,
• stones,
• iron rods,
• wood,
• cement,
• roofing sheet,
• nails

(ii) List four tools for constructing the walls.

? hand trowel
? spirit level
? float
? gauge rod
? straight edge
? mortar board
? line and pins
? brick hammer / comb hammer
? bolster and club hammer
? builder’s square

2. (a) (i) Explain the term draw filing
A technique used for producing smooth, square edges, especially on pieces of metal. The process works by moving any type of single cut file forwards and backwards along the length of the material’s edge

(ii) Sketch the triangular file

(iii) Label any two parts on the sketch in (a)(ii) above.
• Handle
• Tang
• Shoulder
• Ferrule
• Edge
• Teeth

b.(i) Identify the items labeled K, L, M in the circuit diagram above.
K – Switch / Key
L – Bulb
M – Battery

(ii) List two examples of electrical conductors
• Copper
• Gold
• Silver
• Aluminium
• Molybdenum
• Zinc
• Nickel
• etc

(c) (i) State two precautions to be taken when cutting with a hacksaw
• Tie / cover long or loose hair back to prevent entanglement
• Remove all kinds of jewellery to prevent snagging.
• Wear protective clothing to protect the skin
• Wear protective gloves to protect the hands.
• Use ear protectors such as plugs or mufflers to protect the ear.
• Wear goggles / safety glasses to protect the eyes
• Select correct blade for material being cut
• When cutting, use steady strokes directed away from you.
• Do not apply too much pressure on the blade to prevent breaking
• Make sure the material to be cut is securely fastened

(ii) List three driving tools
• Claw hammer
• Screw driver
• Nail Punch
• Crow bar / pinch bar
• Tower pincer

(a) Draw full size the following views in first angle projection

(i) front elevation in the direction of arrow X;

ii) plan

(b) List one specific tool for each of the following processes:
(i) marking-out the tenon
? Marking knife
? Pencil
? Try-square
? Marking gauge
? Rule / Tape measure

(ii) cutting the tenon
? Try square
? Marking gauge / mortise gauge
? Pencil / Marking knife
? Tenon Saw
? Mallet
? Bevel-edged chisel / firmer chisel

(c) State one finish for the flagstand
? Varnish
? Wax
? Lacquer
? Oil paint

(d) (i) Sketch in pictorial drawing a brick hammer

 
4. (a) Explain the following terms:
(i) pinning
Pinning refers to the clogging of the file teeth with pins, which are material shavings. These pins cause the file to lose its cutting ability and can scratch the workpiece.
OR
Pinning occurs when metal pieces, known as pins, get stuck within the teeth of the file. The pins then reduce the effectiveness of the file and also scratch the workpiece.

(ii) curing
Curing of concrete is the provision of adequate moisture, temperature, and time to allow the concrete to achieve the desired properties for its intended use
OR
Curing is the process of maintaining satisfactory moisture content and temperature in freshly cast concrete for a definite period of time immediately following placement

(b) (i) Make a freehand sketch of an outside callipers

(ii) State one use of the outside callipers
Outside callipers are used to measure thicknesses or outside diameters of objects.

(c) State one use of the following measuring tools:
(i) steel rule
• Marking out on a metal plate
• Taking measurements

(ii) tape measure
• Taking measurements
• Setting out
• marking out

(d) State two methods each for maintaining the tools stated in (c) above.
(i) maintaining steel rule
• Keep it clean and dry
• Use it for its intended purpose only
• Avoid bending it
• Avoid scratching its surface

(ii) maintaining tape measure
• After using, roll back into its case
• Keep in a tool box
• Keep it clean and dry
• Use it for its intended purpose only

(e) Copy and complete the table below