For the following questions answer them individually
Which gas will produce the highest efficiency in an ideal Otto cycle for same compression ratio?
In Mollier diagram, the isotherm in the superheated region at low pressures becomes ________.
If the heat rejected from the system is zero, then which of the following statements will hold TRUE?
A reversible engine operates between temperature $$T_1$$ and $$T_2$$. The energy rejected by this engine acts as an input for another reversible engine at temperature $$T_2$$, which rejects to a reservoir at temperature $$T_3$$. What is the relation between $$T_1, T_2$$ and $$T_3$$?