| A sequential lift, nozzle valve control bar on a turbo generator, utilizes which of the following operating principles? |
| A) A lifting beam mechanism engages nozzle valve stems of varying lengths. |
| B) A servomotor, mechanically connected to nozzle valve hand wheels, opens or closes the valves in accordance with the type of electrical signal received. |
| C) A hydraulic piston raises or lowers groups of valves according to pressure received from a governor. |
| D) A hydraulic piston raises or lowers individual valves according to pressure received from a governor. |
