The automatic boost pressure control capsules are made sensitive to which factor?

The automatic boost pressure control capsules are designed to respond to boost pressure. This sensitivity enables the capsules to accurately monitor and regulate the pressure, ensuring that the engine operates efficiently under varying conditions. By directly reacting to changes in boost pressure, the system can make necessary adjustments to maintain optimal performance and power output.

In this context, the operation of the engine is highly dependent on the boost pressure generated by the turbocharger or supercharger, as it directly affects the amount of air entering the engine. Therefore, keeping the boost pressure within the desired range is crucial for maintaining engine efficiency and performance.

The other factors listed, while they may influence engine performance indirectly, do not serve as the primary control mechanism for the automatic boost pressure control capsules. For instance, atmospheric pressure can fluctuate based on weather conditions, the carburettor inlet pressure is relevant for fuel-air mixture but not for the boost control, and cabin pressure differential pertains to aircraft systems rather than directly to engine boost pressure management.