Effect of clearance volume on compression work per kg in reciprocating compressors In a reciprocating air compressor, how does the compression work per kilogram of air vary with clearance volume (other conditions fixed)? Choose the correct option.

Concept/ApproachFor a given pressure ratio and compression law (e.g., polytropic), the work per kg depends on states, not on clearance. Clearance affects volumetric efficiency (mass inducted per cycle), but the indicated work per unit mass compressed is essentially unaffected.

Common pitfallsConfusing work per cycle with work per unit mass. Clearance reduces the mass taken in per cycle but does not raise or lower the thermodynamic work per kg for the same pressure ratio.

Final AnswerIndependent of clearance volume