Ordinary level 2026 South West mock mechanical technology 2

Here is the data extracted from the images provided.

1. PETROL INJECTION SYSTEM (Figure 1)

Context: Figure 1 shows a technical diagram of a petrol injection system with numbered components from 1 to 16.

a) Identify the type of petrol injection system. (1 mark)

b) Fill the table below: (5 marks total)

c) State two parameters required for the ECU to determine the quantity of fuel to be injected. (2 marks)

d) Give TWO disadvantages of the type of injection system shown in figure 1. (2 marks)

2. POLLUTION AND EMISSION CONTROL

Context: The chemical reaction for combustion in an engine’s cylinder is given as:

a) i) State the non-toxic products of the reaction. (0.75 marks)

ii) State the toxic products of the reaction. (0.75 marks)

b) Fill the table below by giving the causes of the indicated pollutants and proposing remedies: (3 marks total)

c) Figure 2 shows a type of emission control.

(The diagram shows a fuel tank, a charcoal canister (1), a purge valve (2), and an air filter (3) connected to the engine throttle body)

i) Identify the type of emission control. (0.5 mark)

ii) Fill the table below: (3 marks total)

d) Explain the operation of the system in FOUR lines. (2 marks)