Topic: Thermodynamics
The critical pressure ratio for maximum discharge in a steam nozzle is (where 'γ' is the isentropic index)
- A. (2/(γ+1))
- B. (2/(γ+1))^(γ/(γ-1))
- C. (2/(γ+1))^(2/(γ-1))
- D. (2/(γ+1))^( (γ-1)/γ )
Answer: B. (2/(γ+1))^(γ/(γ-1))
Explanation: The critical pressure ratio (P*/P₀) for isentropic flow through a nozzle that maximizes the mass flow rate is given by the formula (2/(γ+1))^(γ/(γ-1)).