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For a two stage reciprocating compressor, compression from p₁ to p₃ is with perfect intercooling and no pressure losses. If compression in both the cylinders follows the same polytropic process and the atmospheric pressure is pa, then the intermediate pressure p₂ is given by

A. p₂ = (p₁ + p₃)/2

B. p₂ = p₁. p₃

C. P₂ = Pa × p₃/p₁

D. p₂ = Pa p₃/p₁

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