Discussion
Identify the effect of friction on steam nozzle?
Answer: B
Friction in a steam nozzle reduces the mass flow rate. Friction reheats the steam, increases the dryness and lowers the enthalpy drop that becomes kinetic energy, so the exit velocity is lower and the specific volume at the exit is larger, which reduces the mass flow through the throat. The specific volume increases and the dryness fraction increases, and the actual enthalpy drop decreases, so the other three options state the reverse.
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