Engineering Thermodynamics
Carnot cycle consists of

One constant volume, one constant pressure and two isentropic processes
Two constant volume and two isentropic processes
Two constant pressure and two isentropic processes
Two isothermal and two isentropic processes

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Engineering Thermodynamics
According to Kelvin-Planck’s statement of second law of thermodynamics,

It is impossible to construct a device which operates in a cyclic process and produces no effect other than the transfer of heat from a cold body to a hot body
It is possible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
None of these
It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work

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