SSC JE Mechanical Engineering 22 Mar 2021 Shift 2 Papers

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Question : 172 of 199

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According to Kelvin-Planck’s statement of the second law of thermodynamics, which of the following statements is correct?

Heat from a source should be rejected to a high temperature sink.
It restricts the mechanical efficiency of the heat engine to be lesser than unity.
Thermal efficiency of the heat engine will be unity.
It restricts the thermal efficiency of the heat engine to be lesser than unity.

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