The critical pressure ratio is given by (where p1 = Initial pressure of steam and p2 = Pressure of steam at throat or critical pressure)
A. $${{\text{p}}_1} \times {{\text{p}}_2}$$
B. $$\frac{{{{\text{p}}_1}}}{{{{\text{p}}_2}}}$$
C. $$\frac{{{{\text{p}}_2}}}{{{{\text{p}}_1}}}$$
D. $${{\text{p}}_1} + {{\text{p}}_2}$$
Answer: Option C
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