Which of the following power systems are limited by the 2nd

Which of the following power systems are limited by the 2nd Law of Thermodynamics, i.e., the Carnot efficiency? (You may want to google some of these to understand how they work.) a) Coal-fired steam power plant b) Nuclear reactor steam power plant c) Hydroelectric power plant d) Solar photovoltaic system e) Turbojet aircraft engine f) Internal combustion automobile engine g) Hydrogen fuel cell

Solution

Answer is option C. In Hydroelectric power plant it won\'t use any kinds of thermal energy. That is why it is limited by 2nd law of thermodynamics.