1. The problem statement, all variables and given/known data Figure 2 represents a model for the thermodynamic cycle of the Stirling engine, patented by Scottish clergyman Robert Stirling in 1816. The engine operates by burning fuel externally to warm one of its two cylinders. A xed quantity of inert gas moves cyclically between the cylinders, expanding in the hot one and contracting in the cold one. (a) Consider n mol of an ideal monatomic gas being taken once through the cycle in Fig. 2, consisting of two isothermal processes at temperatures 3Ti and Ti and two isochoric processes. In terms of n, R, and Ti, determine Q for the complete cycle. (b) What is the eciency of the engine? (Hint: The heat QH transferred into the system happens during steps 1 and 4). Figure 2: 2. Relevant equations Work = nRT ln(v2/v1) U = n Cv T efficiency = W/Q 3. The attempt at a solution I am pretty confident in my solution to part a ) of the problem which is this: However when it comes to calculating efficiency, I am getting an answer of 1 . Is this possible? Thank you.