Which type of feedback device is used to provide automatic control of speed, pressure, or temperature?

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Automatic feedback control relies on a device that continuously senses the actual value, compares it to a desired setpoint, and automatically adjusts the input to bring the variable back toward the target. A governor fits this role by sensing rotational speed and automatically altering fuel flow or valve position to maintain the desired speed. When speed rises, the governor tends to restrict input, slowing the system; when speed falls, it increases input, raising the speed again. This continuous feedback loop keeps the variable at the setpoint without manual intervention. While a sensor only provides measurement and a thermostat mainly handles temperature, the governor is the mechanical feedback device specifically used to achieve automatic regulation of speed (and similarly applied to related control situations in many machines).