Which option lists the three types of turbine blades?

Which option lists the three types of turbine blades?

• A. Impulse, Reaction, Impulse-reaction
• B. Impulse
• C. Reaction
• D. Impulse-reaction

Answer: (A)

Three blade types are used in turbine design: impulse blades, reaction blades, and impulse-reaction blades. An impulse blade uses fixed nozzles to direct steam, giving it a large change in momentum with the pressure staying nearly the same across the blade passage. A reaction blade, on the other hand, experiences pressure drop across both stationary and moving blades, so blade forces arise from pressure distribution along the rotor. An impulse-reaction blade combines elements of both: part of the pressure drop occurs in the nozzle and part in the rotor, offering a hybrid behavior. The option that lists impulse, reaction, and impulse-reaction covers all three categories, which is why it is the best choice. The other options name only one type, which doesn’t represent the full classification.

Three blade types are used in turbine design: impulse blades, reaction blades, and impulse-reaction blades. An impulse blade uses fixed nozzles to direct steam, giving it a large change in momentum with the pressure staying nearly the same across the blade passage. A reaction blade, on the other hand, experiences pressure drop across both stationary and moving blades, so blade forces arise from pressure distribution along the rotor. An impulse-reaction blade combines elements of both: part of the pressure drop occurs in the nozzle and part in the rotor, offering a hybrid behavior.

The option that lists impulse, reaction, and impulse-reaction covers all three categories, which is why it is the best choice. The other options name only one type, which doesn’t represent the full classification.