The hand wheel used to adjust turbine speed on the governor is called the:

• A. Speeder
• B. Driver
• C. Setter
• D. Throttle

Answer: (A)

The hand wheel is called the speeder. In a turbine governor, speed is kept by balancing a sensed speed against a manual reference setting. The speeder is the control that sets this reference speed, effectively telling the governor what RPM to aim for. When you turn the speeder up, you raise the target speed and the governor opens the fuel/steam valve more to reach that speed; turning it down lowers the target speed and the valve opens less. The throttle is the actual valve controlled by the governor, not the manual speed-setting wheel, and terms like driver or setter aren’t the standard names for this control.