Which of the following is the Kelvin Planck statement?(a) Heat from a cold reservoir cannot be transferred to a hot reservoir without external work(b) Efficiency for a reversible cyclic process can be 1(c) Heat from a hot reservoir can be completely converted into work if process is reversible(d) Efficiency of a heat engine is less than 1I had been asked this question in unit test.This key question is from Second Law of Thermodynamics in division Thermodynamics of Physics – Class 11

Which of the following is the Kelvin Planck statement?(a) Heat from a

1.	Which of the following is the Kelvin Planck statement?(a) Heat from a cold reservoir cannot be transferred to a hot reservoir without external work(b) Efficiency for a reversible cyclic process can be 1(c) Heat from a hot reservoir can be completely converted into work if process is reversible(d) Efficiency of a heat engine is less than 1I had been asked this question in unit test.This key question is from Second Law of Thermodynamics in division Thermodynamics of Physics – Class 11
Answer» CORRECT option is (d) Efficiency of a HEAT engine is less than 1 For explanation: Kelvin Planck STATEMENT is: No process is possible whose sole RESULT is the absorption of heat from a reservoir and complete conversion of that heat into work. So, this implies that efficiency of a heat engine is less than 1.

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