Question 707Steam Plants - Assistant Engineer

The correct answer is B) the highest practical chest pressure and the minimum number of nozzles required to maintain the desired speed. The main propulsion turbine should be operated at the highest practical chest pressure to maximize efficiency and power output. Using the minimum number of nozzles required to maintain the desired speed helps to minimize steam consumption and reduce waste. Operating the turbine in this manner ensures optimal performance and fuel efficiency. The other options are incorrect because A) and C) call for using the lowest practical chest pressure, which would reduce power and efficiency. Option D) using the maximum number of nozzles is less efficient than the minimum required to maintain speed.