Question 158Steam Plants - QMED

The correct answer is A) prevent uneven cooling of the turbine rotors. When securing the main turbines, the jacking gear must be engaged as quickly as possible to prevent uneven cooling of the turbine rotors. This is because rapid cooling of the turbine rotors can lead to thermal distortion and potential damage to the turbine components. Engaging the jacking gear ensures that the rotors cool evenly and prevents any undue stresses on the turbine. The other answer choices are incorrect because they do not directly address the primary purpose of engaging the jacking gear, which is to ensure even cooling of the turbine rotors.