The pressure-volume of various thermodynamic process is shown in graphs:

Work is the mole of transference of energy. It has been observed that reversible work done by the system is the maximum obtainable work.
`w_(rev) gt w_(irr)`
The works of isothermal and adiabatic processes are different from each other.
`w_("isothermal reversible") = 2.303 nRT log_(10) ((V_(2))/(V_(1)))`
`= 2.303 nRT log_(10)((P_(2))/(P_(1)))`
`w_("adiabatic reversible") = C_(V) (T_(1)-T_(2))`
A thermodynamic system goes in a cyclic process as represented in the following `P -V` diagram:

The net work done during the complete cycle is given by the area

Explanation

Yes. The work done in a cyclic process is zero, if the process reverses exactly under similar conditions such that it retraces the same P-V diagram. In such a case, the area of the curve on a P-V diagram is zero and hence the work done is zero.