In impulse turbines, rotating blades are called Buckets.

• A. Buckets
• B. Pails
• C. Diaphragms
• D. Ports

Answer: (A)

In this concept, the rotating blades in an impulse turbine are called buckets because they are designed to catch the high-velocity steam jet and convert its momentum into rotor rotation. The steam expands in nozzles to a fast jet, which strikes the curved blades mounted on the rotor; the shape and name “bucket” reflect how the blade acts like a scoop catching the jet and imparting impulse.

Other terms don’t fit the role of the rotating blade: pails is just a common synonym for bucket, not the technical name used in engineering. Diaphragms are stationary components that support or separate blade rows and guide flow, not the rotating blades themselves. Ports refer to openings for steam flow, not the blades. So the correct term for the rotating blades is buckets.