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In what aspect does the nozzle make changes?

(a) Temperature

(b) Volume

(c) Pressure

(d) Density

I had been asked this question in an international level competition.

This intriguing question originated from Feed Water and Steam Generation System, Working of Thermal Power Plant topic in portion Steam Power Plant of Energy Engineering

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The correct choice is (c) Pressure

Explanation: Nozzle makes changes in terms of pressure variation. And rest all factors/terms are unaffected. By decreasing the pressure and increasing the velocity at other end through convergent-divergent nozzle, the required force or pace can be achieved to run the blades of turbine.

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