A particular Carnot heat engine has two reservoirs held at different temperatures of 320 K and 2220 K. Select the engines that have the same efficiency as this engine.

Which of the following is true for the entropy change of a system that undergoes a reversible, adiabatic process? (a) S 0 (b) S = 0 (c) S 0

If a 35.0% -efficient Carnot heat engine (Fig. 21.2) is run in reverse so as to form a refrigerator (Fig. 21.4), what would be this refrigerators coefficient of performance? Figure P21.2 Schematic representation of a heat engine. Figure P21.4 Schematic representation of a heat pump.

A Carnot engine operates in a Carnot cycle between a heat source at 550 and a heat sink at 20 . Find the efficiency of the Carnot engine.