SSC JE Mechanical Engineering 2017 Set 3 Paper

A reversible thermodynamic cycle containing only three processes and producing work is to be constructed. The constraints are
(a) there must be one isothermal process
(b) there must be one isentropic process
(c) maximum and minimum cycle pressures and the clearance volume are fixed, and
(d) polytropic processes are not followed Then, the number of possible cycles is