Explain different methods of steam turbine governing.

Steam turbine governing controls turbine speed and power output. Throttle governing adjusts steam pressure at inlet valve, simple but reduces efficiency at part loads due to throttling losses. Nozzle governing controls number of active nozzle groups, maintaining efficiency but causing uneven loading. Bypass governing diverts steam past HP stages at high loads. Combined governing uses multiple methods - nozzle governing for coarse control and throttle for fine adjustment. Modern turbines use electronic-hydraulic systems for precise load following.