Question

A compressor undergoes a reversible, steady flow process. The gas at inlet and outlet of the compressor is designated as state 1 and state 2 respectively. Potential and kinetic energy changes are to be ignored. The following notations are used: v = specific volume and P = pressure of the gas. The specific work required to be supplied to the compressor for this gas compression process is                                            

      (a) $\int_{1}^{2} pdv$                                                               (b) $\int_{1}^{2} vdp$ 

      (c) v₁(P₂–P₁)                                                        (d) –p₂(v₁–v₂)