The definition of 1 K as per the internationally accepted temperature scale is

Any thermodynamic cycle operating between two temperature limits is reversible if the product of efficiency when operating as a heat engine and the coefficient of performance when operating as a refrigeration is equal to $$1.$$

The slopes of constant volume and constant pressure lines in the $$T$$-$$s$$ diagram are ___________ and ___________respectively.

For a given set of operating pressure limits of a Rankine cycle, the highest efficiency occurs for