Question 97Steam Plants - 1st Asst/Chief

The correct answer is A) enables better utilization of available heat energy to perform work. Maintaining low pressure in a condensing turbine exhaust trunk allows the turbine to extract more energy from the steam, as the lower pressure increases the temperature difference between the steam and the cooling medium (typically seawater). This greater temperature difference enables more efficient heat transfer and better utilization of the available thermal energy to perform work and generate power. The other options are incorrect because they do not directly address the primary purpose of maintaining low pressure in the exhaust trunk, which is to improve the overall efficiency of the turbine system.