Modelová Otázka ID 3341 - 
Jaká situace nastane po ukončení jednoho cyklu termodynamického kruhového děje v systému složeném z tepelného stroje a rezervoárů (ohřívač, chladič) se stabilní teplotou?
Správná odpověď je: D
Jestliže má tepelný stroj, v němž dochází ke kruhovému ději, stabilní (konstantní) teplotu, nedochází ke změnám vnitřní energie stroje, neboť teplota je závislá na vnitřní energii stroje a slouží tak jako její ukazatel. Stroj mohl konat práci, protože mohl teplo Q1 přijaté od ohřívače zčásti přeměnit na práci W a zbytek energie mohl odevzdat ve formě tepla Q2 chladiči.
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