Final answer:
Without additional data pertaining to the Ericsson cycle processes, such as heat transfer values and the conditions at various stages of the cycle, the net power developed, thermal efficiency, and back work ratio cannot be calculated.
Step-by-step explanation:
The student is asking about the performance characteristics of an Ericsson cycle, which is a concept in thermodynamics related to the efficiency and work output of heat engines. Firstly, to determine the net power developed (a), the heat added to the system and the work done by each component need to be calculated using the thermodynamic equations for an Ericsson cycle. Specifically, calculations involving isothermal and isobaric processes, as well as the use of specific heats for hydrogen, would be part of the solution. Unfortunately, without additional information on the specifics of each process (like the conditions at the outlet of the turbine and the heat transferred to the working fluid), the answer cannot be calculated.
For the thermal efficiency (b), the general thermal efficiency of an Ericsson cycle can be calculated as the net work output divided by the heat input. However, without information on the heat addition or rejection in each process of the cycle, an exact value cannot be given.
The back work ratio (c), defined as the ratio of the compressor work to the turbine work, requires knowledge about the specific work of both the turbine and compressor, which again cannot be determined from the information provided.