The inter-cooler pressure, for minimum work required, for a two stage reciprocating air compressor, is given by (where p₁ = Intake pressure of air, p₂ = Inter-cooler pressure, and p₃ = Delivery pressure of air)
(A) p₂ = p₁ × p₃
(C) p₂ = p₁ × p₂ (Ans)
(D) p₂ = p₃/p₁