Question 396Steam Plants - 1st Asst/Chief

The correct answer is A) Pump discharge. The constant pressure governor of a turbine-driven feed pump maintains the pump discharge pressure at a constant value, regardless of the pump's capacity. This is because the governor senses the pump discharge pressure and adjusts the turbine's inlet steam flow to maintain the desired discharge pressure. The other options are incorrect because the constant pressure governor does not directly control the turbine inlet pressure (B), the turbine exhaust pressure (C), or the pump suction pressure (D). These pressures may vary as the pump's capacity changes, but the governor's primary function is to keep the pump discharge pressure constant.