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

Answer:

The correct options are

a) heat is completely converted to mechanical energy in such a process, which is not possible

c) curves representing two adiabatic processes don’t intersect

Explanation: In such a process, heat is totally transferred to mechanical energy, which is impossible.
Mechanical energy is converted from heat change. It is impossible to achieve 100% efficiency because no machine is capable of doing so.