# Part 3 - Multiple-Choice Practice Exam: 28

Heat engines, such as a jet engine, are more efficient when run at high temperatures.

#### Work Step by Step

As discussed on page 345, Carnot's equation states that the ideal efficiency of a heat engine is $\frac{T_{hot} – T_{cold}}{T_{hot}}$. Mathematically speaking, increasing the operating temperature allows the engine to be more efficient.

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