During the era of Algorithms and Mechanical Control, which device was used to control engine speed?

• A. Relay-based timer
• B. Centrifugal governor
• C. Analytical Engine
• D. Difference Engine

Answer: (B)

The centrifugal governor is the correct choice as it is a mechanical device specifically designed to regulate the speed of an engine, especially in steam engines. It operates based on the principle of centrifugal force; as the speed of the engine increases, the rotating weights of the governor move outward, which in turn adjusts the fuel supply to the engine to maintain a steady speed. This mechanism is essential for ensuring that the engine runs smoothly without over-revving or stalling.

In contrast, a relay-based timer primarily functions to manage electrical timing functions and isn’t directly applicable for controlling a mechanical engine’s speed. The Analytical Engine and the Difference Engine were early computing machines designed for mathematical calculations and did not serve the purpose of controlling engine speed.