Ordinary level 2026 South West mock materials technology and workshop processes guide
Ordinary level 2026 South West mock materials technology and workshop processes guide
Subject code: 5130 (Materials Technology and Workshop Processes 2)
Question 1: PROPERTIES OF METALS
a- Define the following as regards properties of metals. (0.5mark x 4 = 2 marks)
▪ Hardness: It’s simply the ability of a material to resist penetration or indentation by other hard bodies.
▪ Strength: It’s simply the resistance to the change of the form and breaking of a material.
▪ Ductility: It’s the property of a material enabling it to be drawn into a wire with the application of a tensile
Force.
| ▪ | Hardness: It’s the property of a material of breaking of a material with little permanent distortion. |
| b- Differentiate between physical properties of metals and mechanical properties and give two (02) examples on each | |
| case. | (3 marks) |
Physical properties of metals are those properties that you able to observe with your naked eyes;
Examples: color, size, shape.
While Mechanical properties of metal are those which are associated with the ability of the material to resist
mechanical forces and load. Examples: strength, ductility, brittleness, etc…
c- The hardness of a metal can be determined by using a series of tests. Name three (03) of them. (1 x 3 = 3 marks)
– Brinell hardness test; – Rockwell hardness test; – Vickers hardness test also called diamond pyramid test;
– Knock hardness test; – Durometer test; – Durability test.
d- The selection of a paper material for engineering purposes is one of the most difficult problems for the designers.
State three (03) factors that should be considered while selecting engineering materials. (1mark x 3 = 3 marks)
– Availability of the materials; – Suitability of the material for the working conditions in service;
– The cost of the material.
Question 2: MELTING FURNACES
Figure 1 below represents a type of furnace used in the production of cast iron.
| a- Identify the type of furnace below. Cupola furnace. |
(1 mark) |
| b- Briefly explain what happens in the following zones. (1 mark x 3 = 3 marks) | |
| ▪ | Reduction zone: Also called protective zone, CO2 is changed to CO. Temperature falls to about 1200°C at |
The top of this zone. CO2 + C (coke) 2CO + Heat.
▪ Melting zone: The metal charge starts melting and drops down through the coke bed and is collected in the
well. 3Fe + 2CO Fe3C + CO2
▪ Preheating zone: The charge is preheated from room temperature to about 1090°C before it enters the
melting zone.
c- Give the name of zone 4. Which are the exothermic (heat releasing) reactions that take place in this zone? (2 marks)
