Engineering Thermodynamics
A heat exchange process in which the product of pressure and volume remains constant is known as

Heat exchange process
Hyperbolic process
Isentropic process
Throttling process

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

It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
It is possible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
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
None of these

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Engineering Thermodynamics
Stirling cycle consists of

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

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