Question 137Steam Plants - Assistant Engineer

The correct answer is D) Thermostatic. In the main condensate line of a ship's system, the automatic recirculating valve is typically controlled by a thermostatic sensor. This sensor monitors the temperature of the condensate and triggers the valve to open or close as needed to maintain the proper temperature and prevent damage to the system. The thermostatic sensor is the appropriate choice for this application, as it directly measures the temperature of the condensate and can automatically adjust the valve accordingly. The other options are not the correct choice for this application. Pressure sensors, continuity sensors, and preset electric timing sensors would not be the appropriate control mechanism for an automatic recirculating valve in the main condensate line.