Question 367Steam Plants - 1st Asst/Chief

The correct answer is D) Manually operated sliding jaw clutch. The manually operated sliding jaw clutch is generally used to engage the main engine turning gear to the high pressure turbine high-speed pinion. This type of clutch allows the main engine to be mechanically coupled to the high-speed turbine shaft, enabling the main engine to be used to slowly rotate the turbine shaft for maintenance and pre-start operations. The other options are incorrect because: A) A manually operated band brake is used to hold the main engine or reduction gears in place, not to engage the turning gear. B) A quill shaft is a type of flexible coupling, not a device used to engage the turning gear. C) A sleeve coupling is used to connect two shaft sections, not to engage the turning gear.