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An Intiative by Sri Chaitanya
a
It is impossible to construct a heat engine which can completely convert heat energy into mechanical energy without rejecting heat to surroundings. 100% efficiency is not possible
b
It is impossible to extract work from a system by cooling it below surrounding temperature.
c
It is impossible to transfer heat energy from body at lower temperature to body at higher temperature unaided by external agency.
d
All the above
answer is D.
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