• question_answer A two-stage compressor takes in air at 1.1 bars and, discharges at 20 bars. For maximum efficiency, the intermediate pressure is:                         A) 10.55 bars                    B) 7.33 bars           C) 5.5 bars            D) 4.7 bars

${{p}_{1}}=\sqrt{{{p}_{1}}{{p}_{2}}}=\sqrt{1.1\times 20}$= 4.69 = 4.7 bar