Outside dovetail type turbine blading is used with what type of entry?

The correct answer is circumferential entry because it refers to how the steam or gas flows into the turbine blading. In a circumferential entry design, the flow enters the turbine tangentially around the circumference, which allows the blades to harness the kinetic energy from the fluid more effectively. This design is particularly suited for outside dovetail type turbine blading, where the blades are designed to withstand the high rotational speeds and the stresses that result from operating under these conditions.

Radial entry involves flow entering from a radial direction toward the axis, which is more common in specific turbine designs but does not align with outside dovetail configurations. Axial entry denotes a flow that is parallel to the axis of the turbine, typical in many modern turbines but not specifically related to outside dovetail blades. Diagonal entry is not a standard term used in turbine design and does not reflect the operational mechanics that characterize outside dovetail turbine blading effectively. Therefore, circumferential entry is the most appropriate choice in this context.