Modelová Otázka ID 3317 - 
Které z následujících tvrzení platí pro cyklicky pracující tepelný stroj?
Správná odpověď je: B, C, D
K chodu cyklicky pracujícího tepelného stroje je zapotřebí ohřívač, který stroji dodává teplo Q1, a chladič, jemuž stroj odevzdává teplo Q2.
Ke konání práce je nutno stroji dodávat energii ve formě tepla Q1 (první TDZ), zároveň však nelze veškerou přijatou energii přeměnit na práci (druhý TDZ), takže vzniká odpadní teplo, které je ve formě Q2 odevzdáváno chladiči. Carnotův ideální tepelný stroj je hypotetický stroj pracující s účinností 100 %, jeho sestrojení však není dle druhého TDZ možné.
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