Question 343Steam Plants - 1st Asst/Chief

The correct answer is B) Gear-type flexible coupling. A gear-type flexible coupling is commonly used to compensate for the expansion and minor misalignments that can occur between the main turbine rotor and the reduction gear. This type of coupling allows for some degree of flexibility and movement between the two components, preventing potential issues that could arise from the thermal expansion and minor misalignments that may happen during operation. The other options are not the correct answer. Expansion gear is not a term commonly used in this context, quill shaft is a type of shaft design not specifically used for this purpose, and a sliding sleeve is not the typical device used to address the expansion and misalignment concerns between the turbine and reduction gear.