Question 155Steam Plants - QMED

The correct answer is C) provide reduction gear tooth inspection. The jacking gear on main propulsion turbines is used to slowly rotate the turbine shaft, allowing for visual inspection of the reduction gear teeth. This allows the engineer to check the condition of the gear teeth without the turbine running at full speed. The jacking gear does not provide propulsion in emergencies (B), nor is it used to lift the reduction gear casing (A) or reduce turbine speed during maneuvering (D). The primary purpose of the jacking gear is to facilitate routine inspection and maintenance of the reduction gears, which is a critical safety requirement for the proper operation of the main propulsion system.