Discussion
In reaction steam turbine, the pressure drops
Answer: C
In a reaction steam turbine the pressure drops in both the nozzle (fixed blades) and the moving blade channel. The steam expands partly in the fixed blades and partly in the moving blades, which is why the moving blades work by reaction as well as impulse. In an impulse turbine the pressure drops only in the nozzles, so the options of drop in the nozzle only, or in neither, are wrong.
In the Parsons turbine the stage has 50 percent reaction, where the pressure drop is shared equally between the fixed and the moving blades.
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