Consider a cycle followed by an engine 1 to 2 is isothermal 2 to 3 is adiabatic 3 to 1 is adiabatic Such a process does not exist because

(a) Heat is completely converted to mechanical energy in such a process, which is not possible.

(b) Mechanical energy is completely converted to heat in this process, which is not possible.

(c) Curves representing two adiabatic processes don’t intersect.

(d) Curves representing an adiabatic process and an isothermal process don’t intersect.

<p><span data-teams="true">This is a multiple choice answer as classified in NCERT Exemplar</span></p><p> (a) the given process is a cyclic process i.e returns to the original state 1</p><p>Hence change in internal energy dU =0</p><p>dQ= dU+dW=0+dW</p><p>hence total heat supplied is converted to work done by the gas which is not possible by second law of thermodynamics.</p><p> (c) When the gas expands adiabatically from 2 to 3 . it is not possible to return to the same state without being heat supplied hence 3 to 1 cannot be adiabatic.</p>

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