For perfect intercooling in a two stage compressor
A. $$\frac{{{{\text{p}}_2}}}{{{{\text{p}}_1}}} = \frac{{{{\text{p}}_3}}}{{{{\text{p}}_2}}}$$
B. $$\frac{{{{\text{p}}_1}}}{{{{\text{p}}_3}}} = \frac{{{{\text{p}}_2}}}{{{{\text{p}}_1}}}$$
C. $${{\text{p}}_1} = {{\text{p}}_3}$$
D. $${{\text{p}}_1} = {{\text{p}}_2}{{\text{p}}_3}$$
Answer: Option A

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