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
An isolated system is one in which

Mass does not cross boundaries of the system, though energy may do so
Mass crosses the boundary but not the energy
Neither mass nor energy crosses the boundaries of the system
Both energy and mass cross the boundaries of the system

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Engineering Thermodynamics
Which of the following statement is correct according to Clausis statement of second law of thermodynamics?

It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature.
None of these
It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature by using refrigeration cycle.
It is impossible to transfer heat from a body at a lower temperature to a body at a higher temperature, without the aid of an external source.

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