Question 508Steam Plants - Assistant Engineer

The correct answer is D) articulated double reduction gear. This is correct because the illustration SE-0013 shows a reduction gear with two stages of reduction, where the gear shafts are arranged in an articulated or "broken" configuration rather than being in a straight line. This type of arrangement is known as an articulated double reduction gear. The other options are incorrect because they do not accurately describe the configuration shown in the illustration. A locked-train gear, nested four-step gear, and nested double reduction gear all have different arrangements of the reduction gearing that do not match the illustration.