The effect of variable specific heat and dissociation of the working fluid

Question

  In air – standard Otto cycle the terminal pressures at the end of compression, heat release and expansion are respectively P₂, P₃ and P₄. If the corresponding values are P₂^’, P₃^’, and P₄^’, taking into account the effect of variable specific heat and dissociation of the working fluid, then                                .                                                                                                                                                          (a) P₂ < P₂^’ and P₃ > P₃^’

           (b) P₃ < P₂^’ and P₄ > P₄^’

           (c) P₂ > P₂^’ and P₃ > P₃^’ AMD P₄ < P₄^’

           (d) P₂ > P₂^’, P₃ > P₃^’