Can the given heat energy be completely converted to work in a cyclic process? If not , when can the heat can completely converted to work ?

Explanation

(I ) No. In a cyclic process , the complete heat energy is not completely converted to work . The whole heat can not be converted into work ,as it will violate second law of thermodynamics
(ii) In an isothermal process the whole heat can be converted into work . for an isothermal process dQ = dT , which show that whole heat can be converted into work .