QUESTION 6: \( \begin{array}{l}\text { INTERNAL COMBUSTION ENGINES } \\ \text { 6.1 }\end{array} \) Briefly explain the following terms: \( \begin{array}{lll}6.1 .1 & \text { Stroke } \\ 6.1 .2 & \text { Turbo }\end{array} \) \( 6.2 \quad \) Give TWO functions of the blower in petrol and diesel engines.

The term "stroke" in the context of internal combustion engines refers to the distance traveled by the piston from its highest point (top dead center) to its lowest point (bottom dead center) within the cylinder. This movement is crucial in determining the engine's overall displacement and efficiency, as well as its power output. A single complete cycle of intake, compression, power, and exhaust is completed with each stroke, contributing significantly to engine performance dynamics. "Turbo" refers to a turbocharger, a device that uses exhaust gases to spin a turbine and force more air into the engine's combustion chamber. This increased air allows for more fuel to be burned, which increases power output without significantly increasing engine size or weight. Turbocharging is a popular method to enhance performance and improve fuel efficiency in both petrol and diesel engines, making vehicles more powerful while still being economical. In petrol and diesel engines, the blower serves two critical functions: first, it helps to increase the pressure of the intake air, which improves the combustion process and enhances engine power. Second, it assists in cooling the engine by drawing in ambient air, which helps to prevent overheating, ensuring smoother and more efficient engine performance during operation.