Which of the following statements represents the significance of the differential pressure existing between the nozzle block and steam chest of a turbo generator equipped with a lifting beam mechanism?

Correct Answer: Option C — The pressure differential assists in seating the valves when the lifting beam is lowered.

The pressure drop between the high-pressure steam chest and the lower-pressure nozzle block creates an unbalance force across the poppet valve discs, which actively assists in seating the valves tightly when the lifting beam lowers.